Hu Chunming / vpt_ascend_arm

ffmpeg-codecs.1 189 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579 5580 5581 5582 5583 5584 5585 5586 5587 5588 5589 5590 5591 5592 5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606 5607 5608 5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" Set up some character translations and predefined strings.  \*(-- will
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
.\" double quote, and \*(R" will give a right double quote.  \*(C+ will
.\" give a nicer C++.  Capital omega is used to do unbreakable dashes and
.\" therefore won't be available.  \*(C` and \*(C' expand to `' in nroff,
.\" nothing in troff, for use with C<>.
.tr \(*W-
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.ie n \{\
.    ds -- \(*W-
.    ds PI pi
.    if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
.    if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\"  diablo 12 pitch
.    ds L" ""
.    ds R" ""
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds -- \|\(em\|
.    ds PI \(*p
.    ds L" ``
.    ds R" ''
.    ds C`
.    ds C'
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.\"
.\" Avoid warning from groff about undefined register 'F'.
.de IX
..
.nr rF 0
.if \n(.g .if rF .nr rF 1
.if (\n(rF:(\n(.g==0)) \{\
.    if \nF \{\
.        de IX
.        tm Index:\\$1\t\\n%\t"\\$2"
..
.        if !\nF==2 \{\
.            nr % 0
.            nr F 2
.        \}
.    \}
.\}
.rr rF
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
.    \" fudge factors for nroff and troff
.if n \{\
.    ds #H 0
.    ds #V .8m
.    ds #F .3m
.    ds #[ \f1
.    ds #] \fP
.\}
.if t \{\
.    ds #H ((1u-(\\\\n(.fu%2u))*.13m)
.    ds #V .6m
.    ds #F 0
.    ds #[ \&
.    ds #] \&
.\}
.    \" simple accents for nroff and troff
.if n \{\
.    ds ' \&
.    ds ` \&
.    ds ^ \&
.    ds , \&
.    ds ~ ~
.    ds /
.\}
.if t \{\
.    ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
.    ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
.    ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
.    ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
.    ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
.    ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
.\}
.    \" troff and (daisy-wheel) nroff accents
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
.    \" corrections for vroff
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
.    \" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
.    ds : e
.    ds 8 ss
.    ds o a
.    ds d- d\h'-1'\(ga
.    ds D- D\h'-1'\(hy
.    ds th \o'bp'
.    ds Th \o'LP'
.    ds ae ae
.    ds Ae AE
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "FFMPEG-CODECS 1"
.TH FFMPEG-CODECS 1 " " " " " "
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
ffmpeg\-codecs \- FFmpeg codecs
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This document describes the codecs (decoders and encoders) provided by
the libavcodec library.
.SH "CODEC OPTIONS"
.IX Header "CODEC OPTIONS"
libavcodec provides some generic global options, which can be set on
all the encoders and decoders. In addition each codec may support
so-called private options, which are specific for a given codec.
.PP
Sometimes, a global option may only affect a specific kind of codec,
and may be nonsensical or ignored by another, so you need to be aware
of the meaning of the specified options. Also some options are
meant only for decoding or encoding.
.PP
Options may be set by specifying \-\fIoption\fR \fIvalue\fR in the
FFmpeg tools, or by setting the value explicitly in the
\&\f(CW\*(C`AVCodecContext\*(C'\fR options or using the \fIlibavutil/opt.h\fR \s-1API\s0
for programmatic use.
.PP
The list of supported options follow:
.IP "\fBb\fR \fIinteger\fR \fB(\fR\fIencoding,audio,video\fR\fB)\fR" 4
.IX Item "b integer (encoding,audio,video)"
Set bitrate in bits/s. Default value is 200K.
.IP "\fBab\fR \fIinteger\fR \fB(\fR\fIencoding,audio\fR\fB)\fR" 4
.IX Item "ab integer (encoding,audio)"
Set audio bitrate (in bits/s). Default value is 128K.
.IP "\fBbt\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "bt integer (encoding,video)"
Set video bitrate tolerance (in bits/s). In 1\-pass mode, bitrate
tolerance specifies how far ratecontrol is willing to deviate from the
target average bitrate value. This is not related to min/max
bitrate. Lowering tolerance too much has an adverse effect on quality.
.IP "\fBflags\fR \fIflags\fR \fB(\fR\fIdecoding/encoding,audio,video,subtitles\fR\fB)\fR" 4
.IX Item "flags flags (decoding/encoding,audio,video,subtitles)"
Set generic flags.
.Sp
Possible values:
.RS 4
.IP "\fBmv4\fR" 4
.IX Item "mv4"
Use four motion vector by macroblock (mpeg4).
.IP "\fBqpel\fR" 4
.IX Item "qpel"
Use 1/4 pel motion compensation.
.IP "\fBloop\fR" 4
.IX Item "loop"
Use loop filter.
.IP "\fBqscale\fR" 4
.IX Item "qscale"
Use fixed qscale.
.IP "\fBpass1\fR" 4
.IX Item "pass1"
Use internal 2pass ratecontrol in first pass mode.
.IP "\fBpass2\fR" 4
.IX Item "pass2"
Use internal 2pass ratecontrol in second pass mode.
.IP "\fBgray\fR" 4
.IX Item "gray"
Only decode/encode grayscale.
.IP "\fBpsnr\fR" 4
.IX Item "psnr"
Set error[?] variables during encoding.
.IP "\fBtruncated\fR" 4
.IX Item "truncated"
Input bitstream might be randomly truncated.
.IP "\fBdrop_changed\fR" 4
.IX Item "drop_changed"
Don't output frames whose parameters differ from first decoded frame in stream.
Error \s-1AVERROR_INPUT_CHANGED\s0 is returned when a frame is dropped.
.IP "\fBildct\fR" 4
.IX Item "ildct"
Use interlaced \s-1DCT.\s0
.IP "\fBlow_delay\fR" 4
.IX Item "low_delay"
Force low delay.
.IP "\fBglobal_header\fR" 4
.IX Item "global_header"
Place global headers in extradata instead of every keyframe.
.IP "\fBbitexact\fR" 4
.IX Item "bitexact"
Only write platform\-, build\- and time-independent data. (except (I)DCT).
This ensures that file and data checksums are reproducible and match between
platforms. Its primary use is for regression testing.
.IP "\fBaic\fR" 4
.IX Item "aic"
Apply H263 advanced intra coding / mpeg4 ac prediction.
.IP "\fBilme\fR" 4
.IX Item "ilme"
Apply interlaced motion estimation.
.IP "\fBcgop\fR" 4
.IX Item "cgop"
Use closed gop.
.IP "\fBoutput_corrupt\fR" 4
.IX Item "output_corrupt"
Output even potentially corrupted frames.
.RE
.RS 4
.RE
.IP "\fBtime_base\fR \fIrational number\fR" 4
.IX Item "time_base rational number"
Set codec time base.
.Sp
It is the fundamental unit of time (in seconds) in terms of which
frame timestamps are represented. For fixed-fps content, timebase
should be \f(CW\*(C`1 / frame_rate\*(C'\fR and timestamp increments should be
identically 1.
.IP "\fBg\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "g integer (encoding,video)"
Set the group of picture (\s-1GOP\s0) size. Default value is 12.
.IP "\fBar\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,audio\fR\fB)\fR" 4
.IX Item "ar integer (decoding/encoding,audio)"
Set audio sampling rate (in Hz).
.IP "\fBac\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,audio\fR\fB)\fR" 4
.IX Item "ac integer (decoding/encoding,audio)"
Set number of audio channels.
.IP "\fBcutoff\fR \fIinteger\fR \fB(\fR\fIencoding,audio\fR\fB)\fR" 4
.IX Item "cutoff integer (encoding,audio)"
Set cutoff bandwidth. (Supported only by selected encoders, see
their respective documentation sections.)
.IP "\fBframe_size\fR \fIinteger\fR \fB(\fR\fIencoding,audio\fR\fB)\fR" 4
.IX Item "frame_size integer (encoding,audio)"
Set audio frame size.
.Sp
Each submitted frame except the last must contain exactly frame_size
samples per channel. May be 0 when the codec has
\&\s-1CODEC_CAP_VARIABLE_FRAME_SIZE\s0 set, in that case the frame size is not
restricted. It is set by some decoders to indicate constant frame
size.
.IP "\fBframe_number\fR \fIinteger\fR" 4
.IX Item "frame_number integer"
Set the frame number.
.IP "\fBdelay\fR \fIinteger\fR" 4
.IX Item "delay integer"
.PD 0
.IP "\fBqcomp\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "qcomp float (encoding,video)"
.PD
Set video quantizer scale compression (\s-1VBR\s0). It is used as a constant
in the ratecontrol equation. Recommended range for default rc_eq:
0.0\-1.0.
.IP "\fBqblur\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "qblur float (encoding,video)"
Set video quantizer scale blur (\s-1VBR\s0).
.IP "\fBqmin\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "qmin integer (encoding,video)"
Set min video quantizer scale (\s-1VBR\s0). Must be included between \-1 and
69, default value is 2.
.IP "\fBqmax\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "qmax integer (encoding,video)"
Set max video quantizer scale (\s-1VBR\s0). Must be included between \-1 and
1024, default value is 31.
.IP "\fBqdiff\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "qdiff integer (encoding,video)"
Set max difference between the quantizer scale (\s-1VBR\s0).
.IP "\fBbf\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "bf integer (encoding,video)"
Set max number of B frames between non-B-frames.
.Sp
Must be an integer between \-1 and 16. 0 means that B\-frames are
disabled. If a value of \-1 is used, it will choose an automatic value
depending on the encoder.
.Sp
Default value is 0.
.IP "\fBb_qfactor\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "b_qfactor float (encoding,video)"
Set qp factor between P and B frames.
.IP "\fBb_strategy\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "b_strategy integer (encoding,video)"
Set strategy to choose between I/P/B\-frames.
.IP "\fBps\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "ps integer (encoding,video)"
Set \s-1RTP\s0 payload size in bytes.
.IP "\fBmv_bits\fR \fIinteger\fR" 4
.IX Item "mv_bits integer"
.PD 0
.IP "\fBheader_bits\fR \fIinteger\fR" 4
.IX Item "header_bits integer"
.IP "\fBi_tex_bits\fR \fIinteger\fR" 4
.IX Item "i_tex_bits integer"
.IP "\fBp_tex_bits\fR \fIinteger\fR" 4
.IX Item "p_tex_bits integer"
.IP "\fBi_count\fR \fIinteger\fR" 4
.IX Item "i_count integer"
.IP "\fBp_count\fR \fIinteger\fR" 4
.IX Item "p_count integer"
.IP "\fBskip_count\fR \fIinteger\fR" 4
.IX Item "skip_count integer"
.IP "\fBmisc_bits\fR \fIinteger\fR" 4
.IX Item "misc_bits integer"
.IP "\fBframe_bits\fR \fIinteger\fR" 4
.IX Item "frame_bits integer"
.IP "\fBcodec_tag\fR \fIinteger\fR" 4
.IX Item "codec_tag integer"
.IP "\fBbug\fR \fIflags\fR \fB(\fR\fIdecoding,video\fR\fB)\fR" 4
.IX Item "bug flags (decoding,video)"
.PD
Workaround not auto detected encoder bugs.
.Sp
Possible values:
.RS 4
.IP "\fBautodetect\fR" 4
.IX Item "autodetect"
.PD 0
.IP "\fBxvid_ilace\fR" 4
.IX Item "xvid_ilace"
.PD
Xvid interlacing bug (autodetected if fourcc==XVIX)
.IP "\fBump4\fR" 4
.IX Item "ump4"
(autodetected if fourcc==UMP4)
.IP "\fBno_padding\fR" 4
.IX Item "no_padding"
padding bug (autodetected)
.IP "\fBamv\fR" 4
.IX Item "amv"
.PD 0
.IP "\fBqpel_chroma\fR" 4
.IX Item "qpel_chroma"
.IP "\fBstd_qpel\fR" 4
.IX Item "std_qpel"
.PD
old standard qpel (autodetected per fourcc/version)
.IP "\fBqpel_chroma2\fR" 4
.IX Item "qpel_chroma2"
.PD 0
.IP "\fBdirect_blocksize\fR" 4
.IX Item "direct_blocksize"
.PD
direct-qpel-blocksize bug (autodetected per fourcc/version)
.IP "\fBedge\fR" 4
.IX Item "edge"
edge padding bug (autodetected per fourcc/version)
.IP "\fBhpel_chroma\fR" 4
.IX Item "hpel_chroma"
.PD 0
.IP "\fBdc_clip\fR" 4
.IX Item "dc_clip"
.IP "\fBms\fR" 4
.IX Item "ms"
.PD
Workaround various bugs in microsoft broken decoders.
.IP "\fBtrunc\fR" 4
.IX Item "trunc"
trancated frames
.RE
.RS 4
.RE
.IP "\fBstrict\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,audio,video\fR\fB)\fR" 4
.IX Item "strict integer (decoding/encoding,audio,video)"
Specify how strictly to follow the standards.
.Sp
Possible values:
.RS 4
.IP "\fBvery\fR" 4
.IX Item "very"
strictly conform to an older more strict version of the spec or reference software
.IP "\fBstrict\fR" 4
.IX Item "strict"
strictly conform to all the things in the spec no matter what consequences
.IP "\fBnormal\fR" 4
.IX Item "normal"
.PD 0
.IP "\fBunofficial\fR" 4
.IX Item "unofficial"
.PD
allow unofficial extensions
.IP "\fBexperimental\fR" 4
.IX Item "experimental"
allow non standardized experimental things, experimental
(unfinished/work in progress/not well tested) decoders and encoders.
Note: experimental decoders can pose a security risk, do not use this for
decoding untrusted input.
.RE
.RS 4
.RE
.IP "\fBb_qoffset\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "b_qoffset float (encoding,video)"
Set \s-1QP\s0 offset between P and B frames.
.IP "\fBerr_detect\fR \fIflags\fR \fB(\fR\fIdecoding,audio,video\fR\fB)\fR" 4
.IX Item "err_detect flags (decoding,audio,video)"
Set error detection flags.
.Sp
Possible values:
.RS 4
.IP "\fBcrccheck\fR" 4
.IX Item "crccheck"
verify embedded CRCs
.IP "\fBbitstream\fR" 4
.IX Item "bitstream"
detect bitstream specification deviations
.IP "\fBbuffer\fR" 4
.IX Item "buffer"
detect improper bitstream length
.IP "\fBexplode\fR" 4
.IX Item "explode"
abort decoding on minor error detection
.IP "\fBignore_err\fR" 4
.IX Item "ignore_err"
ignore decoding errors, and continue decoding.
This is useful if you want to analyze the content of a video and thus want
everything to be decoded no matter what. This option will not result in a video
that is pleasing to watch in case of errors.
.IP "\fBcareful\fR" 4
.IX Item "careful"
consider things that violate the spec and have not been seen in the wild as errors
.IP "\fBcompliant\fR" 4
.IX Item "compliant"
consider all spec non compliancies as errors
.IP "\fBaggressive\fR" 4
.IX Item "aggressive"
consider things that a sane encoder should not do as an error
.RE
.RS 4
.RE
.IP "\fBhas_b_frames\fR \fIinteger\fR" 4
.IX Item "has_b_frames integer"
.PD 0
.IP "\fBblock_align\fR \fIinteger\fR" 4
.IX Item "block_align integer"
.IP "\fBmpeg_quant\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "mpeg_quant integer (encoding,video)"
.PD
Use \s-1MPEG\s0 quantizers instead of H.263.
.IP "\fBrc_override_count\fR \fIinteger\fR" 4
.IX Item "rc_override_count integer"
.PD 0
.IP "\fBmaxrate\fR \fIinteger\fR \fB(\fR\fIencoding,audio,video\fR\fB)\fR" 4
.IX Item "maxrate integer (encoding,audio,video)"
.PD
Set max bitrate tolerance (in bits/s). Requires bufsize to be set.
.IP "\fBminrate\fR \fIinteger\fR \fB(\fR\fIencoding,audio,video\fR\fB)\fR" 4
.IX Item "minrate integer (encoding,audio,video)"
Set min bitrate tolerance (in bits/s). Most useful in setting up a \s-1CBR\s0
encode. It is of little use elsewise.
.IP "\fBbufsize\fR \fIinteger\fR \fB(\fR\fIencoding,audio,video\fR\fB)\fR" 4
.IX Item "bufsize integer (encoding,audio,video)"
Set ratecontrol buffer size (in bits).
.IP "\fBi_qfactor\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "i_qfactor float (encoding,video)"
Set \s-1QP\s0 factor between P and I frames.
.IP "\fBi_qoffset\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "i_qoffset float (encoding,video)"
Set \s-1QP\s0 offset between P and I frames.
.IP "\fBdct\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "dct integer (encoding,video)"
Set \s-1DCT\s0 algorithm.
.Sp
Possible values:
.RS 4
.IP "\fBauto\fR" 4
.IX Item "auto"
autoselect a good one (default)
.IP "\fBfastint\fR" 4
.IX Item "fastint"
fast integer
.IP "\fBint\fR" 4
.IX Item "int"
accurate integer
.IP "\fBmmx\fR" 4
.IX Item "mmx"
.PD 0
.IP "\fBaltivec\fR" 4
.IX Item "altivec"
.IP "\fBfaan\fR" 4
.IX Item "faan"
.PD
floating point \s-1AAN DCT\s0
.RE
.RS 4
.RE
.IP "\fBlumi_mask\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "lumi_mask float (encoding,video)"
Compress bright areas stronger than medium ones.
.IP "\fBtcplx_mask\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "tcplx_mask float (encoding,video)"
Set temporal complexity masking.
.IP "\fBscplx_mask\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "scplx_mask float (encoding,video)"
Set spatial complexity masking.
.IP "\fBp_mask\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "p_mask float (encoding,video)"
Set inter masking.
.IP "\fBdark_mask\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "dark_mask float (encoding,video)"
Compress dark areas stronger than medium ones.
.IP "\fBidct\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,video\fR\fB)\fR" 4
.IX Item "idct integer (decoding/encoding,video)"
Select \s-1IDCT\s0 implementation.
.Sp
Possible values:
.RS 4
.IP "\fBauto\fR" 4
.IX Item "auto"
.PD 0
.IP "\fBint\fR" 4
.IX Item "int"
.IP "\fBsimple\fR" 4
.IX Item "simple"
.IP "\fBsimplemmx\fR" 4
.IX Item "simplemmx"
.IP "\fBsimpleauto\fR" 4
.IX Item "simpleauto"
.PD
Automatically pick a \s-1IDCT\s0 compatible with the simple one
.IP "\fBarm\fR" 4
.IX Item "arm"
.PD 0
.IP "\fBaltivec\fR" 4
.IX Item "altivec"
.IP "\fBsh4\fR" 4
.IX Item "sh4"
.IP "\fBsimplearm\fR" 4
.IX Item "simplearm"
.IP "\fBsimplearmv5te\fR" 4
.IX Item "simplearmv5te"
.IP "\fBsimplearmv6\fR" 4
.IX Item "simplearmv6"
.IP "\fBsimpleneon\fR" 4
.IX Item "simpleneon"
.IP "\fBxvid\fR" 4
.IX Item "xvid"
.IP "\fBfaani\fR" 4
.IX Item "faani"
.PD
floating point \s-1AAN IDCT\s0
.RE
.RS 4
.RE
.IP "\fBslice_count\fR \fIinteger\fR" 4
.IX Item "slice_count integer"
.PD 0
.IP "\fBec\fR \fIflags\fR \fB(\fR\fIdecoding,video\fR\fB)\fR" 4
.IX Item "ec flags (decoding,video)"
.PD
Set error concealment strategy.
.Sp
Possible values:
.RS 4
.IP "\fBguess_mvs\fR" 4
.IX Item "guess_mvs"
iterative motion vector (\s-1MV\s0) search (slow)
.IP "\fBdeblock\fR" 4
.IX Item "deblock"
use strong deblock filter for damaged MBs
.IP "\fBfavor_inter\fR" 4
.IX Item "favor_inter"
favor predicting from the previous frame instead of the current
.RE
.RS 4
.RE
.IP "\fBbits_per_coded_sample\fR \fIinteger\fR" 4
.IX Item "bits_per_coded_sample integer"
.PD 0
.IP "\fBpred\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "pred integer (encoding,video)"
.PD
Set prediction method.
.Sp
Possible values:
.RS 4
.IP "\fBleft\fR" 4
.IX Item "left"
.PD 0
.IP "\fBplane\fR" 4
.IX Item "plane"
.IP "\fBmedian\fR" 4
.IX Item "median"
.RE
.RS 4
.RE
.IP "\fBaspect\fR \fIrational number\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "aspect rational number (encoding,video)"
.PD
Set sample aspect ratio.
.IP "\fBsar\fR \fIrational number\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "sar rational number (encoding,video)"
Set sample aspect ratio. Alias to \fIaspect\fR.
.IP "\fBdebug\fR \fIflags\fR \fB(\fR\fIdecoding/encoding,audio,video,subtitles\fR\fB)\fR" 4
.IX Item "debug flags (decoding/encoding,audio,video,subtitles)"
Print specific debug info.
.Sp
Possible values:
.RS 4
.IP "\fBpict\fR" 4
.IX Item "pict"
picture info
.IP "\fBrc\fR" 4
.IX Item "rc"
rate control
.IP "\fBbitstream\fR" 4
.IX Item "bitstream"
.PD 0
.IP "\fBmb_type\fR" 4
.IX Item "mb_type"
.PD
macroblock (\s-1MB\s0) type
.IP "\fBqp\fR" 4
.IX Item "qp"
per-block quantization parameter (\s-1QP\s0)
.IP "\fBdct_coeff\fR" 4
.IX Item "dct_coeff"
.PD 0
.IP "\fBgreen_metadata\fR" 4
.IX Item "green_metadata"
.PD
display complexity metadata for the upcoming frame, GoP or for a given duration.
.IP "\fBskip\fR" 4
.IX Item "skip"
.PD 0
.IP "\fBstartcode\fR" 4
.IX Item "startcode"
.IP "\fBer\fR" 4
.IX Item "er"
.PD
error recognition
.IP "\fBmmco\fR" 4
.IX Item "mmco"
memory management control operations (H.264)
.IP "\fBbugs\fR" 4
.IX Item "bugs"
.PD 0
.IP "\fBbuffers\fR" 4
.IX Item "buffers"
.PD
picture buffer allocations
.IP "\fBthread_ops\fR" 4
.IX Item "thread_ops"
threading operations
.IP "\fBnomc\fR" 4
.IX Item "nomc"
skip motion compensation
.RE
.RS 4
.RE
.IP "\fBcmp\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "cmp integer (encoding,video)"
Set full pel me compare function.
.Sp
Possible values:
.RS 4
.IP "\fBsad\fR" 4
.IX Item "sad"
sum of absolute differences, fast (default)
.IP "\fBsse\fR" 4
.IX Item "sse"
sum of squared errors
.IP "\fBsatd\fR" 4
.IX Item "satd"
sum of absolute Hadamard transformed differences
.IP "\fBdct\fR" 4
.IX Item "dct"
sum of absolute \s-1DCT\s0 transformed differences
.IP "\fBpsnr\fR" 4
.IX Item "psnr"
sum of squared quantization errors (avoid, low quality)
.IP "\fBbit\fR" 4
.IX Item "bit"
number of bits needed for the block
.IP "\fBrd\fR" 4
.IX Item "rd"
rate distortion optimal, slow
.IP "\fBzero\fR" 4
.IX Item "zero"
0
.IP "\fBvsad\fR" 4
.IX Item "vsad"
sum of absolute vertical differences
.IP "\fBvsse\fR" 4
.IX Item "vsse"
sum of squared vertical differences
.IP "\fBnsse\fR" 4
.IX Item "nsse"
noise preserving sum of squared differences
.IP "\fBw53\fR" 4
.IX Item "w53"
5/3 wavelet, only used in snow
.IP "\fBw97\fR" 4
.IX Item "w97"
9/7 wavelet, only used in snow
.IP "\fBdctmax\fR" 4
.IX Item "dctmax"
.PD 0
.IP "\fBchroma\fR" 4
.IX Item "chroma"
.RE
.RS 4
.RE
.IP "\fBsubcmp\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "subcmp integer (encoding,video)"
.PD
Set sub pel me compare function.
.Sp
Possible values:
.RS 4
.IP "\fBsad\fR" 4
.IX Item "sad"
sum of absolute differences, fast (default)
.IP "\fBsse\fR" 4
.IX Item "sse"
sum of squared errors
.IP "\fBsatd\fR" 4
.IX Item "satd"
sum of absolute Hadamard transformed differences
.IP "\fBdct\fR" 4
.IX Item "dct"
sum of absolute \s-1DCT\s0 transformed differences
.IP "\fBpsnr\fR" 4
.IX Item "psnr"
sum of squared quantization errors (avoid, low quality)
.IP "\fBbit\fR" 4
.IX Item "bit"
number of bits needed for the block
.IP "\fBrd\fR" 4
.IX Item "rd"
rate distortion optimal, slow
.IP "\fBzero\fR" 4
.IX Item "zero"
0
.IP "\fBvsad\fR" 4
.IX Item "vsad"
sum of absolute vertical differences
.IP "\fBvsse\fR" 4
.IX Item "vsse"
sum of squared vertical differences
.IP "\fBnsse\fR" 4
.IX Item "nsse"
noise preserving sum of squared differences
.IP "\fBw53\fR" 4
.IX Item "w53"
5/3 wavelet, only used in snow
.IP "\fBw97\fR" 4
.IX Item "w97"
9/7 wavelet, only used in snow
.IP "\fBdctmax\fR" 4
.IX Item "dctmax"
.PD 0
.IP "\fBchroma\fR" 4
.IX Item "chroma"
.RE
.RS 4
.RE
.IP "\fBmbcmp\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "mbcmp integer (encoding,video)"
.PD
Set macroblock compare function.
.Sp
Possible values:
.RS 4
.IP "\fBsad\fR" 4
.IX Item "sad"
sum of absolute differences, fast (default)
.IP "\fBsse\fR" 4
.IX Item "sse"
sum of squared errors
.IP "\fBsatd\fR" 4
.IX Item "satd"
sum of absolute Hadamard transformed differences
.IP "\fBdct\fR" 4
.IX Item "dct"
sum of absolute \s-1DCT\s0 transformed differences
.IP "\fBpsnr\fR" 4
.IX Item "psnr"
sum of squared quantization errors (avoid, low quality)
.IP "\fBbit\fR" 4
.IX Item "bit"
number of bits needed for the block
.IP "\fBrd\fR" 4
.IX Item "rd"
rate distortion optimal, slow
.IP "\fBzero\fR" 4
.IX Item "zero"
0
.IP "\fBvsad\fR" 4
.IX Item "vsad"
sum of absolute vertical differences
.IP "\fBvsse\fR" 4
.IX Item "vsse"
sum of squared vertical differences
.IP "\fBnsse\fR" 4
.IX Item "nsse"
noise preserving sum of squared differences
.IP "\fBw53\fR" 4
.IX Item "w53"
5/3 wavelet, only used in snow
.IP "\fBw97\fR" 4
.IX Item "w97"
9/7 wavelet, only used in snow
.IP "\fBdctmax\fR" 4
.IX Item "dctmax"
.PD 0
.IP "\fBchroma\fR" 4
.IX Item "chroma"
.RE
.RS 4
.RE
.IP "\fBildctcmp\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "ildctcmp integer (encoding,video)"
.PD
Set interlaced dct compare function.
.Sp
Possible values:
.RS 4
.IP "\fBsad\fR" 4
.IX Item "sad"
sum of absolute differences, fast (default)
.IP "\fBsse\fR" 4
.IX Item "sse"
sum of squared errors
.IP "\fBsatd\fR" 4
.IX Item "satd"
sum of absolute Hadamard transformed differences
.IP "\fBdct\fR" 4
.IX Item "dct"
sum of absolute \s-1DCT\s0 transformed differences
.IP "\fBpsnr\fR" 4
.IX Item "psnr"
sum of squared quantization errors (avoid, low quality)
.IP "\fBbit\fR" 4
.IX Item "bit"
number of bits needed for the block
.IP "\fBrd\fR" 4
.IX Item "rd"
rate distortion optimal, slow
.IP "\fBzero\fR" 4
.IX Item "zero"
0
.IP "\fBvsad\fR" 4
.IX Item "vsad"
sum of absolute vertical differences
.IP "\fBvsse\fR" 4
.IX Item "vsse"
sum of squared vertical differences
.IP "\fBnsse\fR" 4
.IX Item "nsse"
noise preserving sum of squared differences
.IP "\fBw53\fR" 4
.IX Item "w53"
5/3 wavelet, only used in snow
.IP "\fBw97\fR" 4
.IX Item "w97"
9/7 wavelet, only used in snow
.IP "\fBdctmax\fR" 4
.IX Item "dctmax"
.PD 0
.IP "\fBchroma\fR" 4
.IX Item "chroma"
.RE
.RS 4
.RE
.IP "\fBdia_size\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "dia_size integer (encoding,video)"
.PD
Set diamond type & size for motion estimation.
.RS 4
.IP "\fB(1024, \s-1INT_MAX\s0)\fR" 4
.IX Item "(1024, INT_MAX)"
full motion estimation(slowest)
.IP "\fB(768, 1024]\fR" 4
.IX Item "(768, 1024]"
umh motion estimation
.IP "\fB(512, 768]\fR" 4
.IX Item "(512, 768]"
hex motion estimation
.IP "\fB(256, 512]\fR" 4
.IX Item "(256, 512]"
l2s diamond motion estimation
.IP "\fB[2,256]\fR" 4
.IX Item "[2,256]"
var diamond motion estimation
.IP "\fB(\-1,  2)\fR" 4
.IX Item "(-1, 2)"
small diamond motion estimation
.IP "\fB\-1\fR" 4
.IX Item "-1"
funny diamond motion estimation
.IP "\fB(\s-1INT_MIN,\s0 \-1)\fR" 4
.IX Item "(INT_MIN, -1)"
sab diamond motion estimation
.RE
.RS 4
.RE
.IP "\fBlast_pred\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "last_pred integer (encoding,video)"
Set amount of motion predictors from the previous frame.
.IP "\fBpreme\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "preme integer (encoding,video)"
Set pre motion estimation.
.IP "\fBprecmp\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "precmp integer (encoding,video)"
Set pre motion estimation compare function.
.Sp
Possible values:
.RS 4
.IP "\fBsad\fR" 4
.IX Item "sad"
sum of absolute differences, fast (default)
.IP "\fBsse\fR" 4
.IX Item "sse"
sum of squared errors
.IP "\fBsatd\fR" 4
.IX Item "satd"
sum of absolute Hadamard transformed differences
.IP "\fBdct\fR" 4
.IX Item "dct"
sum of absolute \s-1DCT\s0 transformed differences
.IP "\fBpsnr\fR" 4
.IX Item "psnr"
sum of squared quantization errors (avoid, low quality)
.IP "\fBbit\fR" 4
.IX Item "bit"
number of bits needed for the block
.IP "\fBrd\fR" 4
.IX Item "rd"
rate distortion optimal, slow
.IP "\fBzero\fR" 4
.IX Item "zero"
0
.IP "\fBvsad\fR" 4
.IX Item "vsad"
sum of absolute vertical differences
.IP "\fBvsse\fR" 4
.IX Item "vsse"
sum of squared vertical differences
.IP "\fBnsse\fR" 4
.IX Item "nsse"
noise preserving sum of squared differences
.IP "\fBw53\fR" 4
.IX Item "w53"
5/3 wavelet, only used in snow
.IP "\fBw97\fR" 4
.IX Item "w97"
9/7 wavelet, only used in snow
.IP "\fBdctmax\fR" 4
.IX Item "dctmax"
.PD 0
.IP "\fBchroma\fR" 4
.IX Item "chroma"
.RE
.RS 4
.RE
.IP "\fBpre_dia_size\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "pre_dia_size integer (encoding,video)"
.PD
Set diamond type & size for motion estimation pre-pass.
.IP "\fBsubq\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "subq integer (encoding,video)"
Set sub pel motion estimation quality.
.IP "\fBme_range\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "me_range integer (encoding,video)"
Set limit motion vectors range (1023 for DivX player).
.IP "\fBglobal_quality\fR \fIinteger\fR \fB(\fR\fIencoding,audio,video\fR\fB)\fR" 4
.IX Item "global_quality integer (encoding,audio,video)"
.PD 0
.IP "\fBcoder\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "coder integer (encoding,video)"
.PD
Possible values:
.RS 4
.IP "\fBvlc\fR" 4
.IX Item "vlc"
variable length coder / huffman coder
.IP "\fBac\fR" 4
.IX Item "ac"
arithmetic coder
.IP "\fBraw\fR" 4
.IX Item "raw"
raw (no encoding)
.IP "\fBrle\fR" 4
.IX Item "rle"
run-length coder
.RE
.RS 4
.RE
.IP "\fBcontext\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "context integer (encoding,video)"
Set context model.
.IP "\fBslice_flags\fR \fIinteger\fR" 4
.IX Item "slice_flags integer"
.PD 0
.IP "\fBmbd\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "mbd integer (encoding,video)"
.PD
Set macroblock decision algorithm (high quality mode).
.Sp
Possible values:
.RS 4
.IP "\fBsimple\fR" 4
.IX Item "simple"
use mbcmp (default)
.IP "\fBbits\fR" 4
.IX Item "bits"
use fewest bits
.IP "\fBrd\fR" 4
.IX Item "rd"
use best rate distortion
.RE
.RS 4
.RE
.IP "\fBsc_threshold\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "sc_threshold integer (encoding,video)"
Set scene change threshold.
.IP "\fBnr\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "nr integer (encoding,video)"
Set noise reduction.
.IP "\fBrc_init_occupancy\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "rc_init_occupancy integer (encoding,video)"
Set number of bits which should be loaded into the rc buffer before
decoding starts.
.IP "\fBflags2\fR \fIflags\fR \fB(\fR\fIdecoding/encoding,audio,video,subtitles\fR\fB)\fR" 4
.IX Item "flags2 flags (decoding/encoding,audio,video,subtitles)"
Possible values:
.RS 4
.IP "\fBfast\fR" 4
.IX Item "fast"
Allow non spec compliant speedup tricks.
.IP "\fBnoout\fR" 4
.IX Item "noout"
Skip bitstream encoding.
.IP "\fBignorecrop\fR" 4
.IX Item "ignorecrop"
Ignore cropping information from sps.
.IP "\fBlocal_header\fR" 4
.IX Item "local_header"
Place global headers at every keyframe instead of in extradata.
.IP "\fBchunks\fR" 4
.IX Item "chunks"
Frame data might be split into multiple chunks.
.IP "\fBshowall\fR" 4
.IX Item "showall"
Show all frames before the first keyframe.
.IP "\fBexport_mvs\fR" 4
.IX Item "export_mvs"
Export motion vectors into frame side-data (see \f(CW\*(C`AV_FRAME_DATA_MOTION_VECTORS\*(C'\fR)
for codecs that support it. See also \fIdoc/examples/export_mvs.c\fR.
.IP "\fBskip_manual\fR" 4
.IX Item "skip_manual"
Do not skip samples and export skip information as frame side data.
.IP "\fBass_ro_flush_noop\fR" 4
.IX Item "ass_ro_flush_noop"
Do not reset \s-1ASS\s0 ReadOrder field on flush.
.RE
.RS 4
.RE
.IP "\fBexport_side_data\fR \fIflags\fR \fB(\fR\fIdecoding/encoding,audio,video,subtitles\fR\fB)\fR" 4
.IX Item "export_side_data flags (decoding/encoding,audio,video,subtitles)"
Possible values:
.RS 4
.IP "\fBmvs\fR" 4
.IX Item "mvs"
Export motion vectors into frame side-data (see \f(CW\*(C`AV_FRAME_DATA_MOTION_VECTORS\*(C'\fR)
for codecs that support it. See also \fIdoc/examples/export_mvs.c\fR.
.IP "\fBprft\fR" 4
.IX Item "prft"
Export encoder Producer Reference Time into packet side-data (see \f(CW\*(C`AV_PKT_DATA_PRFT\*(C'\fR)
for codecs that support it.
.IP "\fBvenc_params\fR" 4
.IX Item "venc_params"
Export video encoding parameters through frame side data (see \f(CW\*(C`AV_FRAME_DATA_VIDEO_ENC_PARAMS\*(C'\fR)
for codecs that support it. At present, those are H.264 and \s-1VP9.\s0
.IP "\fBfilm_grain\fR" 4
.IX Item "film_grain"
Export film grain parameters through frame side data (see \f(CW\*(C`AV_FRAME_DATA_FILM_GRAIN_PARAMS\*(C'\fR).
Supported at present by \s-1AV1\s0 decoders.
.RE
.RS 4
.RE
.IP "\fBthreads\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,video\fR\fB)\fR" 4
.IX Item "threads integer (decoding/encoding,video)"
Set the number of threads to be used, in case the selected codec
implementation supports multi-threading.
.Sp
Possible values:
.RS 4
.IP "\fBauto, 0\fR" 4
.IX Item "auto, 0"
automatically select the number of threads to set
.RE
.RS 4
.Sp
Default value is \fBauto\fR.
.RE
.IP "\fBdc\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "dc integer (encoding,video)"
Set intra_dc_precision.
.IP "\fBnssew\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "nssew integer (encoding,video)"
Set nsse weight.
.IP "\fBskip_top\fR \fIinteger\fR \fB(\fR\fIdecoding,video\fR\fB)\fR" 4
.IX Item "skip_top integer (decoding,video)"
Set number of macroblock rows at the top which are skipped.
.IP "\fBskip_bottom\fR \fIinteger\fR \fB(\fR\fIdecoding,video\fR\fB)\fR" 4
.IX Item "skip_bottom integer (decoding,video)"
Set number of macroblock rows at the bottom which are skipped.
.IP "\fBprofile\fR \fIinteger\fR \fB(\fR\fIencoding,audio,video\fR\fB)\fR" 4
.IX Item "profile integer (encoding,audio,video)"
Set encoder codec profile. Default value is \fBunknown\fR. Encoder specific
profiles are documented in the relevant encoder documentation.
.IP "\fBlevel\fR \fIinteger\fR \fB(\fR\fIencoding,audio,video\fR\fB)\fR" 4
.IX Item "level integer (encoding,audio,video)"
Possible values:
.RS 4
.IP "\fBunknown\fR" 4
.IX Item "unknown"
.RE
.RS 4
.RE
.PD 0
.IP "\fBlowres\fR \fIinteger\fR \fB(\fR\fIdecoding,audio,video\fR\fB)\fR" 4
.IX Item "lowres integer (decoding,audio,video)"
.PD
Decode at 1= 1/2, 2=1/4, 3=1/8 resolutions.
.IP "\fBskip_threshold\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "skip_threshold integer (encoding,video)"
Set frame skip threshold.
.IP "\fBskip_factor\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "skip_factor integer (encoding,video)"
Set frame skip factor.
.IP "\fBskip_exp\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "skip_exp integer (encoding,video)"
Set frame skip exponent.
Negative values behave identical to the corresponding positive ones, except
that the score is normalized.
Positive values exist primarily for compatibility reasons and are not so useful.
.IP "\fBskipcmp\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "skipcmp integer (encoding,video)"
Set frame skip compare function.
.Sp
Possible values:
.RS 4
.IP "\fBsad\fR" 4
.IX Item "sad"
sum of absolute differences, fast (default)
.IP "\fBsse\fR" 4
.IX Item "sse"
sum of squared errors
.IP "\fBsatd\fR" 4
.IX Item "satd"
sum of absolute Hadamard transformed differences
.IP "\fBdct\fR" 4
.IX Item "dct"
sum of absolute \s-1DCT\s0 transformed differences
.IP "\fBpsnr\fR" 4
.IX Item "psnr"
sum of squared quantization errors (avoid, low quality)
.IP "\fBbit\fR" 4
.IX Item "bit"
number of bits needed for the block
.IP "\fBrd\fR" 4
.IX Item "rd"
rate distortion optimal, slow
.IP "\fBzero\fR" 4
.IX Item "zero"
0
.IP "\fBvsad\fR" 4
.IX Item "vsad"
sum of absolute vertical differences
.IP "\fBvsse\fR" 4
.IX Item "vsse"
sum of squared vertical differences
.IP "\fBnsse\fR" 4
.IX Item "nsse"
noise preserving sum of squared differences
.IP "\fBw53\fR" 4
.IX Item "w53"
5/3 wavelet, only used in snow
.IP "\fBw97\fR" 4
.IX Item "w97"
9/7 wavelet, only used in snow
.IP "\fBdctmax\fR" 4
.IX Item "dctmax"
.PD 0
.IP "\fBchroma\fR" 4
.IX Item "chroma"
.RE
.RS 4
.RE
.IP "\fBmblmin\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "mblmin integer (encoding,video)"
.PD
Set min macroblock lagrange factor (\s-1VBR\s0).
.IP "\fBmblmax\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "mblmax integer (encoding,video)"
Set max macroblock lagrange factor (\s-1VBR\s0).
.IP "\fBmepc\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "mepc integer (encoding,video)"
Set motion estimation bitrate penalty compensation (1.0 = 256).
.IP "\fBskip_loop_filter\fR \fIinteger\fR \fB(\fR\fIdecoding,video\fR\fB)\fR" 4
.IX Item "skip_loop_filter integer (decoding,video)"
.PD 0
.IP "\fBskip_idct\fR        \fIinteger\fR \fB(\fR\fIdecoding,video\fR\fB)\fR" 4
.IX Item "skip_idct integer (decoding,video)"
.IP "\fBskip_frame\fR       \fIinteger\fR \fB(\fR\fIdecoding,video\fR\fB)\fR" 4
.IX Item "skip_frame integer (decoding,video)"
.PD
Make decoder discard processing depending on the frame type selected
by the option value.
.Sp
\&\fBskip_loop_filter\fR skips frame loop filtering, \fBskip_idct\fR
skips frame IDCT/dequantization, \fBskip_frame\fR skips decoding.
.Sp
Possible values:
.RS 4
.IP "\fBnone\fR" 4
.IX Item "none"
Discard no frame.
.IP "\fBdefault\fR" 4
.IX Item "default"
Discard useless frames like 0\-sized frames.
.IP "\fBnoref\fR" 4
.IX Item "noref"
Discard all non-reference frames.
.IP "\fBbidir\fR" 4
.IX Item "bidir"
Discard all bidirectional frames.
.IP "\fBnokey\fR" 4
.IX Item "nokey"
Discard all frames excepts keyframes.
.IP "\fBnointra\fR" 4
.IX Item "nointra"
Discard all frames except I frames.
.IP "\fBall\fR" 4
.IX Item "all"
Discard all frames.
.RE
.RS 4
.Sp
Default value is \fBdefault\fR.
.RE
.IP "\fBbidir_refine\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "bidir_refine integer (encoding,video)"
Refine the two motion vectors used in bidirectional macroblocks.
.IP "\fBbrd_scale\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "brd_scale integer (encoding,video)"
Downscale frames for dynamic B\-frame decision.
.IP "\fBkeyint_min\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "keyint_min integer (encoding,video)"
Set minimum interval between IDR-frames.
.IP "\fBrefs\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "refs integer (encoding,video)"
Set reference frames to consider for motion compensation.
.IP "\fBchromaoffset\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "chromaoffset integer (encoding,video)"
Set chroma qp offset from luma.
.IP "\fBtrellis\fR \fIinteger\fR \fB(\fR\fIencoding,audio,video\fR\fB)\fR" 4
.IX Item "trellis integer (encoding,audio,video)"
Set rate-distortion optimal quantization.
.IP "\fBmv0_threshold\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "mv0_threshold integer (encoding,video)"
.PD 0
.IP "\fBb_sensitivity\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "b_sensitivity integer (encoding,video)"
.PD
Adjust sensitivity of b_frame_strategy 1.
.IP "\fBcompression_level\fR \fIinteger\fR \fB(\fR\fIencoding,audio,video\fR\fB)\fR" 4
.IX Item "compression_level integer (encoding,audio,video)"
.PD 0
.IP "\fBmin_prediction_order\fR \fIinteger\fR \fB(\fR\fIencoding,audio\fR\fB)\fR" 4
.IX Item "min_prediction_order integer (encoding,audio)"
.IP "\fBmax_prediction_order\fR \fIinteger\fR \fB(\fR\fIencoding,audio\fR\fB)\fR" 4
.IX Item "max_prediction_order integer (encoding,audio)"
.IP "\fBtimecode_frame_start\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "timecode_frame_start integer (encoding,video)"
.PD
Set \s-1GOP\s0 timecode frame start number, in non drop frame format.
.IP "\fBbits_per_raw_sample\fR \fIinteger\fR" 4
.IX Item "bits_per_raw_sample integer"
.PD 0
.IP "\fBchannel_layout\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,audio\fR\fB)\fR" 4
.IX Item "channel_layout integer (decoding/encoding,audio)"
.PD
Possible values:
.IP "\fBrequest_channel_layout\fR \fIinteger\fR \fB(\fR\fIdecoding,audio\fR\fB)\fR" 4
.IX Item "request_channel_layout integer (decoding,audio)"
Possible values:
.IP "\fBrc_max_vbv_use\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "rc_max_vbv_use float (encoding,video)"
.PD 0
.IP "\fBrc_min_vbv_use\fR \fIfloat\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "rc_min_vbv_use float (encoding,video)"
.IP "\fBticks_per_frame\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,audio,video\fR\fB)\fR" 4
.IX Item "ticks_per_frame integer (decoding/encoding,audio,video)"
.IP "\fBcolor_primaries\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,video\fR\fB)\fR" 4
.IX Item "color_primaries integer (decoding/encoding,video)"
.PD
Possible values:
.RS 4
.IP "\fBbt709\fR" 4
.IX Item "bt709"
\&\s-1BT.709\s0
.IP "\fBbt470m\fR" 4
.IX Item "bt470m"
\&\s-1BT.470 M\s0
.IP "\fBbt470bg\fR" 4
.IX Item "bt470bg"
\&\s-1BT.470 BG\s0
.IP "\fBsmpte170m\fR" 4
.IX Item "smpte170m"
\&\s-1SMPTE 170 M\s0
.IP "\fBsmpte240m\fR" 4
.IX Item "smpte240m"
\&\s-1SMPTE 240 M\s0
.IP "\fBfilm\fR" 4
.IX Item "film"
Film
.IP "\fBbt2020\fR" 4
.IX Item "bt2020"
\&\s-1BT.2020\s0
.IP "\fBsmpte428\fR" 4
.IX Item "smpte428"
.PD 0
.IP "\fBsmpte428_1\fR" 4
.IX Item "smpte428_1"
.PD
\&\s-1SMPTE ST 428\-1\s0
.IP "\fBsmpte431\fR" 4
.IX Item "smpte431"
\&\s-1SMPTE 431\-2\s0
.IP "\fBsmpte432\fR" 4
.IX Item "smpte432"
\&\s-1SMPTE 432\-1\s0
.IP "\fBjedec\-p22\fR" 4
.IX Item "jedec-p22"
\&\s-1JEDEC P22\s0
.RE
.RS 4
.RE
.IP "\fBcolor_trc\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,video\fR\fB)\fR" 4
.IX Item "color_trc integer (decoding/encoding,video)"
Possible values:
.RS 4
.IP "\fBbt709\fR" 4
.IX Item "bt709"
\&\s-1BT.709\s0
.IP "\fBgamma22\fR" 4
.IX Item "gamma22"
\&\s-1BT.470 M\s0
.IP "\fBgamma28\fR" 4
.IX Item "gamma28"
\&\s-1BT.470 BG\s0
.IP "\fBsmpte170m\fR" 4
.IX Item "smpte170m"
\&\s-1SMPTE 170 M\s0
.IP "\fBsmpte240m\fR" 4
.IX Item "smpte240m"
\&\s-1SMPTE 240 M\s0
.IP "\fBlinear\fR" 4
.IX Item "linear"
Linear
.IP "\fBlog\fR" 4
.IX Item "log"
.PD 0
.IP "\fBlog100\fR" 4
.IX Item "log100"
.PD
Log
.IP "\fBlog_sqrt\fR" 4
.IX Item "log_sqrt"
.PD 0
.IP "\fBlog316\fR" 4
.IX Item "log316"
.PD
Log square root
.IP "\fBiec61966_2_4\fR" 4
.IX Item "iec61966_2_4"
.PD 0
.IP "\fBiec61966\-2\-4\fR" 4
.IX Item "iec61966-2-4"
.PD
\&\s-1IEC 61966\-2\-4\s0
.IP "\fBbt1361\fR" 4
.IX Item "bt1361"
.PD 0
.IP "\fBbt1361e\fR" 4
.IX Item "bt1361e"
.PD
\&\s-1BT.1361\s0
.IP "\fBiec61966_2_1\fR" 4
.IX Item "iec61966_2_1"
.PD 0
.IP "\fBiec61966\-2\-1\fR" 4
.IX Item "iec61966-2-1"
.PD
\&\s-1IEC 61966\-2\-1\s0
.IP "\fBbt2020_10\fR" 4
.IX Item "bt2020_10"
.PD 0
.IP "\fBbt2020_10bit\fR" 4
.IX Item "bt2020_10bit"
.PD
\&\s-1BT.2020\s0 \- 10 bit
.IP "\fBbt2020_12\fR" 4
.IX Item "bt2020_12"
.PD 0
.IP "\fBbt2020_12bit\fR" 4
.IX Item "bt2020_12bit"
.PD
\&\s-1BT.2020\s0 \- 12 bit
.IP "\fBsmpte2084\fR" 4
.IX Item "smpte2084"
\&\s-1SMPTE ST 2084\s0
.IP "\fBsmpte428\fR" 4
.IX Item "smpte428"
.PD 0
.IP "\fBsmpte428_1\fR" 4
.IX Item "smpte428_1"
.PD
\&\s-1SMPTE ST 428\-1\s0
.IP "\fBarib\-std\-b67\fR" 4
.IX Item "arib-std-b67"
\&\s-1ARIB STD\-B67\s0
.RE
.RS 4
.RE
.IP "\fBcolorspace\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,video\fR\fB)\fR" 4
.IX Item "colorspace integer (decoding/encoding,video)"
Possible values:
.RS 4
.IP "\fBrgb\fR" 4
.IX Item "rgb"
\&\s-1RGB\s0
.IP "\fBbt709\fR" 4
.IX Item "bt709"
\&\s-1BT.709\s0
.IP "\fBfcc\fR" 4
.IX Item "fcc"
\&\s-1FCC\s0
.IP "\fBbt470bg\fR" 4
.IX Item "bt470bg"
\&\s-1BT.470 BG\s0
.IP "\fBsmpte170m\fR" 4
.IX Item "smpte170m"
\&\s-1SMPTE 170 M\s0
.IP "\fBsmpte240m\fR" 4
.IX Item "smpte240m"
\&\s-1SMPTE 240 M\s0
.IP "\fBycocg\fR" 4
.IX Item "ycocg"
\&\s-1YCOCG\s0
.IP "\fBbt2020nc\fR" 4
.IX Item "bt2020nc"
.PD 0
.IP "\fBbt2020_ncl\fR" 4
.IX Item "bt2020_ncl"
.PD
\&\s-1BT.2020 NCL\s0
.IP "\fBbt2020c\fR" 4
.IX Item "bt2020c"
.PD 0
.IP "\fBbt2020_cl\fR" 4
.IX Item "bt2020_cl"
.PD
\&\s-1BT.2020 CL\s0
.IP "\fBsmpte2085\fR" 4
.IX Item "smpte2085"
\&\s-1SMPTE 2085\s0
.IP "\fBchroma-derived-nc\fR" 4
.IX Item "chroma-derived-nc"
Chroma-derived \s-1NCL\s0
.IP "\fBchroma-derived-c\fR" 4
.IX Item "chroma-derived-c"
Chroma-derived \s-1CL\s0
.IP "\fBictcp\fR" 4
.IX Item "ictcp"
ICtCp
.RE
.RS 4
.RE
.IP "\fBcolor_range\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,video\fR\fB)\fR" 4
.IX Item "color_range integer (decoding/encoding,video)"
If used as input parameter, it serves as a hint to the decoder, which
color_range the input has.
Possible values:
.RS 4
.IP "\fBtv\fR" 4
.IX Item "tv"
.PD 0
.IP "\fBmpeg\fR" 4
.IX Item "mpeg"
.PD
\&\s-1MPEG\s0 (219*2^(n\-8))
.IP "\fBpc\fR" 4
.IX Item "pc"
.PD 0
.IP "\fBjpeg\fR" 4
.IX Item "jpeg"
.PD
\&\s-1JPEG\s0 (2^n\-1)
.RE
.RS 4
.RE
.IP "\fBchroma_sample_location\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,video\fR\fB)\fR" 4
.IX Item "chroma_sample_location integer (decoding/encoding,video)"
Possible values:
.RS 4
.IP "\fBleft\fR" 4
.IX Item "left"
.PD 0
.IP "\fBcenter\fR" 4
.IX Item "center"
.IP "\fBtopleft\fR" 4
.IX Item "topleft"
.IP "\fBtop\fR" 4
.IX Item "top"
.IP "\fBbottomleft\fR" 4
.IX Item "bottomleft"
.IP "\fBbottom\fR" 4
.IX Item "bottom"
.RE
.RS 4
.RE
.IP "\fBlog_level_offset\fR \fIinteger\fR" 4
.IX Item "log_level_offset integer"
.PD
Set the log level offset.
.IP "\fBslices\fR \fIinteger\fR \fB(\fR\fIencoding,video\fR\fB)\fR" 4
.IX Item "slices integer (encoding,video)"
Number of slices, used in parallelized encoding.
.IP "\fBthread_type\fR \fIflags\fR \fB(\fR\fIdecoding/encoding,video\fR\fB)\fR" 4
.IX Item "thread_type flags (decoding/encoding,video)"
Select which multithreading methods to use.
.Sp
Use of \fBframe\fR will increase decoding delay by one frame per
thread, so clients which cannot provide future frames should not use
it.
.Sp
Possible values:
.RS 4
.IP "\fBslice\fR" 4
.IX Item "slice"
Decode more than one part of a single frame at once.
.Sp
Multithreading using slices works only when the video was encoded with
slices.
.IP "\fBframe\fR" 4
.IX Item "frame"
Decode more than one frame at once.
.RE
.RS 4
.Sp
Default value is \fBslice+frame\fR.
.RE
.IP "\fBaudio_service_type\fR \fIinteger\fR \fB(\fR\fIencoding,audio\fR\fB)\fR" 4
.IX Item "audio_service_type integer (encoding,audio)"
Set audio service type.
.Sp
Possible values:
.RS 4
.IP "\fBma\fR" 4
.IX Item "ma"
Main Audio Service
.IP "\fBef\fR" 4
.IX Item "ef"
Effects
.IP "\fBvi\fR" 4
.IX Item "vi"
Visually Impaired
.IP "\fBhi\fR" 4
.IX Item "hi"
Hearing Impaired
.IP "\fBdi\fR" 4
.IX Item "di"
Dialogue
.IP "\fBco\fR" 4
.IX Item "co"
Commentary
.IP "\fBem\fR" 4
.IX Item "em"
Emergency
.IP "\fBvo\fR" 4
.IX Item "vo"
Voice Over
.IP "\fBka\fR" 4
.IX Item "ka"
Karaoke
.RE
.RS 4
.RE
.IP "\fBrequest_sample_fmt\fR \fIsample_fmt\fR \fB(\fR\fIdecoding,audio\fR\fB)\fR" 4
.IX Item "request_sample_fmt sample_fmt (decoding,audio)"
Set sample format audio decoders should prefer. Default value is
\&\f(CW\*(C`none\*(C'\fR.
.IP "\fBpkt_timebase\fR \fIrational number\fR" 4
.IX Item "pkt_timebase rational number"
.PD 0
.IP "\fBsub_charenc\fR \fIencoding\fR \fB(\fR\fIdecoding,subtitles\fR\fB)\fR" 4
.IX Item "sub_charenc encoding (decoding,subtitles)"
.PD
Set the input subtitles character encoding.
.IP "\fBfield_order\fR  \fIfield_order\fR \fB(\fR\fIvideo\fR\fB)\fR" 4
.IX Item "field_order field_order (video)"
Set/override the field order of the video.
Possible values:
.RS 4
.IP "\fBprogressive\fR" 4
.IX Item "progressive"
Progressive video
.IP "\fBtt\fR" 4
.IX Item "tt"
Interlaced video, top field coded and displayed first
.IP "\fBbb\fR" 4
.IX Item "bb"
Interlaced video, bottom field coded and displayed first
.IP "\fBtb\fR" 4
.IX Item "tb"
Interlaced video, top coded first, bottom displayed first
.IP "\fBbt\fR" 4
.IX Item "bt"
Interlaced video, bottom coded first, top displayed first
.RE
.RS 4
.RE
.IP "\fBskip_alpha\fR \fIbool\fR \fB(\fR\fIdecoding,video\fR\fB)\fR" 4
.IX Item "skip_alpha bool (decoding,video)"
Set to 1 to disable processing alpha (transparency). This works like the
\&\fBgray\fR flag in the \fBflags\fR option which skips chroma information
instead of alpha. Default is 0.
.IP "\fBcodec_whitelist\fR \fIlist\fR \fB(\fR\fIinput\fR\fB)\fR" 4
.IX Item "codec_whitelist list (input)"
\&\*(L",\*(R" separated list of allowed decoders. By default all are allowed.
.IP "\fBdump_separator\fR \fIstring\fR \fB(\fR\fIinput\fR\fB)\fR" 4
.IX Item "dump_separator string (input)"
Separator used to separate the fields printed on the command line about the
Stream parameters.
For example, to separate the fields with newlines and indentation:
.Sp
.Vb 2
\&        ffprobe \-dump_separator "
\&                                  "  \-i ~/videos/matrixbench_mpeg2.mpg
.Ve
.IP "\fBmax_pixels\fR \fIinteger\fR \fB(\fR\fIdecoding/encoding,video\fR\fB)\fR" 4
.IX Item "max_pixels integer (decoding/encoding,video)"
Maximum number of pixels per image. This value can be used to avoid out of
memory failures due to large images.
.IP "\fBapply_cropping\fR \fIbool\fR \fB(\fR\fIdecoding,video\fR\fB)\fR" 4
.IX Item "apply_cropping bool (decoding,video)"
Enable cropping if cropping parameters are multiples of the required
alignment for the left and top parameters. If the alignment is not met the
cropping will be partially applied to maintain alignment.
Default is 1 (enabled).
Note: The required alignment depends on if \f(CW\*(C`AV_CODEC_FLAG_UNALIGNED\*(C'\fR is set and the
\&\s-1CPU.\s0 \f(CW\*(C`AV_CODEC_FLAG_UNALIGNED\*(C'\fR cannot be changed from the command line. Also hardware
decoders will not apply left/top Cropping.
.SH "DECODERS"
.IX Header "DECODERS"
Decoders are configured elements in FFmpeg which allow the decoding of
multimedia streams.
.PP
When you configure your FFmpeg build, all the supported native decoders
are enabled by default. Decoders requiring an external library must be enabled
manually via the corresponding \f(CW\*(C`\-\-enable\-lib\*(C'\fR option. You can list all
available decoders using the configure option \f(CW\*(C`\-\-list\-decoders\*(C'\fR.
.PP
You can disable all the decoders with the configure option
\&\f(CW\*(C`\-\-disable\-decoders\*(C'\fR and selectively enable / disable single decoders
with the options \f(CW\*(C`\-\-enable\-decoder=\f(CIDECODER\f(CW\*(C'\fR /
\&\f(CW\*(C`\-\-disable\-decoder=\f(CIDECODER\f(CW\*(C'\fR.
.PP
The option \f(CW\*(C`\-decoders\*(C'\fR of the ff* tools will display the list of
enabled decoders.
.SH "VIDEO DECODERS"
.IX Header "VIDEO DECODERS"
A description of some of the currently available video decoders
follows.
.SS "av1"
.IX Subsection "av1"
AOMedia Video 1 (\s-1AV1\s0) decoder.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBoperating_point\fR" 4
.IX Item "operating_point"
Select an operating point of a scalable \s-1AV1\s0 bitstream (0 \- 31). Default is 0.
.SS "rawvideo"
.IX Subsection "rawvideo"
Raw video decoder.
.PP
This decoder decodes rawvideo streams.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBtop\fR \fItop_field_first\fR" 4
.IX Item "top top_field_first"
Specify the assumed field type of the input video.
.RS 4
.IP "\fB\-1\fR" 4
.IX Item "-1"
the video is assumed to be progressive (default)
.IP "\fB0\fR" 4
.IX Item "0"
bottom-field-first is assumed
.IP "\fB1\fR" 4
.IX Item "1"
top-field-first is assumed
.RE
.RS 4
.RE
.SS "libdav1d"
.IX Subsection "libdav1d"
dav1d \s-1AV1\s0 decoder.
.PP
libdav1d allows libavcodec to decode the AOMedia Video 1 (\s-1AV1\s0) codec.
Requires the presence of the libdav1d headers and library during configuration.
You need to explicitly configure the build with \f(CW\*(C`\-\-enable\-libdav1d\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are supported by the libdav1d wrapper.
.IP "\fBframethreads\fR" 4
.IX Item "framethreads"
Set amount of frame threads to use during decoding. The default value is 0 (autodetect).
.IP "\fBtilethreads\fR" 4
.IX Item "tilethreads"
Set amount of tile threads to use during decoding. The default value is 0 (autodetect).
.IP "\fBfilmgrain\fR" 4
.IX Item "filmgrain"
Apply film grain to the decoded video if present in the bitstream. Defaults to the
internal default of the library.
.IP "\fBoppoint\fR" 4
.IX Item "oppoint"
Select an operating point of a scalable \s-1AV1\s0 bitstream (0 \- 31). Defaults to the
internal default of the library.
.IP "\fBalllayers\fR" 4
.IX Item "alllayers"
Output all spatial layers of a scalable \s-1AV1\s0 bitstream. The default value is false.
.SS "libdavs2"
.IX Subsection "libdavs2"
\&\s-1AVS2\-P2/IEEE1857.4\s0 video decoder wrapper.
.PP
This decoder allows libavcodec to decode \s-1AVS2\s0 streams with davs2 library.
.SS "libuavs3d"
.IX Subsection "libuavs3d"
\&\s-1AVS3\-P2/IEEE1857.10\s0 video decoder.
.PP
libuavs3d allows libavcodec to decode \s-1AVS3\s0 streams.
Requires the presence of the libuavs3d headers and library during configuration.
You need to explicitly configure the build with \f(CW\*(C`\-\-enable\-libuavs3d\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following option is supported by the libuavs3d wrapper.
.IP "\fBframe_threads\fR" 4
.IX Item "frame_threads"
Set amount of frame threads to use during decoding. The default value is 0 (autodetect).
.SH "AUDIO DECODERS"
.IX Header "AUDIO DECODERS"
A description of some of the currently available audio decoders
follows.
.SS "ac3"
.IX Subsection "ac3"
\&\s-1AC\-3\s0 audio decoder.
.PP
This decoder implements part of \s-1ATSC A/52:2010\s0 and \s-1ETSI TS 102 366,\s0 as well as
the undocumented RealAudio 3 (a.k.a. dnet).
.PP
\fI\s-1AC\-3\s0 Decoder Options\fR
.IX Subsection "AC-3 Decoder Options"
.IP "\fB\-drc_scale\fR \fIvalue\fR" 4
.IX Item "-drc_scale value"
Dynamic Range Scale Factor. The factor to apply to dynamic range values
from the \s-1AC\-3\s0 stream. This factor is applied exponentially. The default value is 1.
There are 3 notable scale factor ranges:
.RS 4
.IP "\fBdrc_scale == 0\fR" 4
.IX Item "drc_scale == 0"
\&\s-1DRC\s0 disabled. Produces full range audio.
.IP "\fB0 < drc_scale <= 1\fR" 4
.IX Item "0 < drc_scale <= 1"
\&\s-1DRC\s0 enabled.  Applies a fraction of the stream \s-1DRC\s0 value.
Audio reproduction is between full range and full compression.
.IP "\fBdrc_scale > 1\fR" 4
.IX Item "drc_scale > 1"
\&\s-1DRC\s0 enabled. Applies drc_scale asymmetrically.
Loud sounds are fully compressed.  Soft sounds are enhanced.
.RE
.RS 4
.RE
.SS "flac"
.IX Subsection "flac"
\&\s-1FLAC\s0 audio decoder.
.PP
This decoder aims to implement the complete \s-1FLAC\s0 specification from Xiph.
.PP
\fI\s-1FLAC\s0 Decoder options\fR
.IX Subsection "FLAC Decoder options"
.IP "\fB\-use_buggy_lpc\fR" 4
.IX Item "-use_buggy_lpc"
The lavc \s-1FLAC\s0 encoder used to produce buggy streams with high lpc values
(like the default value). This option makes it possible to decode such streams
correctly by using lavc's old buggy lpc logic for decoding.
.SS "ffwavesynth"
.IX Subsection "ffwavesynth"
Internal wave synthesizer.
.PP
This decoder generates wave patterns according to predefined sequences. Its
use is purely internal and the format of the data it accepts is not publicly
documented.
.SS "libcelt"
.IX Subsection "libcelt"
libcelt decoder wrapper.
.PP
libcelt allows libavcodec to decode the Xiph \s-1CELT\s0 ultra-low delay audio codec.
Requires the presence of the libcelt headers and library during configuration.
You need to explicitly configure the build with \f(CW\*(C`\-\-enable\-libcelt\*(C'\fR.
.SS "libgsm"
.IX Subsection "libgsm"
libgsm decoder wrapper.
.PP
libgsm allows libavcodec to decode the \s-1GSM\s0 full rate audio codec. Requires
the presence of the libgsm headers and library during configuration. You need
to explicitly configure the build with \f(CW\*(C`\-\-enable\-libgsm\*(C'\fR.
.PP
This decoder supports both the ordinary \s-1GSM\s0 and the Microsoft variant.
.SS "libilbc"
.IX Subsection "libilbc"
libilbc decoder wrapper.
.PP
libilbc allows libavcodec to decode the Internet Low Bitrate Codec (iLBC)
audio codec. Requires the presence of the libilbc headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libilbc\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following option is supported by the libilbc wrapper.
.IP "\fBenhance\fR" 4
.IX Item "enhance"
Enable the enhancement of the decoded audio when set to 1. The default
value is 0 (disabled).
.SS "libopencore-amrnb"
.IX Subsection "libopencore-amrnb"
libopencore-amrnb decoder wrapper.
.PP
libopencore-amrnb allows libavcodec to decode the Adaptive Multi-Rate
Narrowband audio codec. Using it requires the presence of the
libopencore-amrnb headers and library during configuration. You need to
explicitly configure the build with \f(CW\*(C`\-\-enable\-libopencore\-amrnb\*(C'\fR.
.PP
An FFmpeg native decoder for AMR-NB exists, so users can decode AMR-NB
without this library.
.SS "libopencore-amrwb"
.IX Subsection "libopencore-amrwb"
libopencore-amrwb decoder wrapper.
.PP
libopencore-amrwb allows libavcodec to decode the Adaptive Multi-Rate
Wideband audio codec. Using it requires the presence of the
libopencore-amrwb headers and library during configuration. You need to
explicitly configure the build with \f(CW\*(C`\-\-enable\-libopencore\-amrwb\*(C'\fR.
.PP
An FFmpeg native decoder for AMR-WB exists, so users can decode AMR-WB
without this library.
.SS "libopus"
.IX Subsection "libopus"
libopus decoder wrapper.
.PP
libopus allows libavcodec to decode the Opus Interactive Audio Codec.
Requires the presence of the libopus headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libopus\*(C'\fR.
.PP
An FFmpeg native decoder for Opus exists, so users can decode Opus
without this library.
.SH "SUBTITLES DECODERS"
.IX Header "SUBTITLES DECODERS"
.SS "libaribb24"
.IX Subsection "libaribb24"
\&\s-1ARIB STD\-B24\s0 caption decoder.
.PP
Implements profiles A and C of the \s-1ARIB STD\-B24\s0 standard.
.PP
\fIlibaribb24 Decoder Options\fR
.IX Subsection "libaribb24 Decoder Options"
.IP "\fB\-aribb24\-base\-path\fR \fIpath\fR" 4
.IX Item "-aribb24-base-path path"
Sets the base path for the libaribb24 library. This is utilized for reading of
configuration files (for custom unicode conversions), and for dumping of
non-text symbols as images under that location.
.Sp
Unset by default.
.IP "\fB\-aribb24\-skip\-ruby\-text\fR \fIboolean\fR" 4
.IX Item "-aribb24-skip-ruby-text boolean"
Tells the decoder wrapper to skip text blocks that contain half-height ruby
text.
.Sp
Enabled by default.
.SS "dvbsub"
.IX Subsection "dvbsub"
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBcompute_clut\fR" 4
.IX Item "compute_clut"
.RS 4
.PD 0
.IP "\fB\-1\fR" 4
.IX Item "-1"
.PD
Compute clut if no matching \s-1CLUT\s0 is in the stream.
.IP "\fB0\fR" 4
.IX Item "0"
Never compute \s-1CLUT\s0
.IP "\fB1\fR" 4
.IX Item "1"
Always compute \s-1CLUT\s0 and override the one provided in the stream.
.RE
.RS 4
.RE
.IP "\fBdvb_substream\fR" 4
.IX Item "dvb_substream"
Selects the dvb substream, or all substreams if \-1 which is default.
.SS "dvdsub"
.IX Subsection "dvdsub"
This codec decodes the bitmap subtitles used in DVDs; the same subtitles can
also be found in VobSub file pairs and in some Matroska files.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBpalette\fR" 4
.IX Item "palette"
Specify the global palette used by the bitmaps. When stored in VobSub, the
palette is normally specified in the index file; in Matroska, the palette is
stored in the codec extra-data in the same format as in VobSub. In DVDs, the
palette is stored in the \s-1IFO\s0 file, and therefore not available when reading
from dumped \s-1VOB\s0 files.
.Sp
The format for this option is a string containing 16 24\-bits hexadecimal
numbers (without 0x prefix) separated by commas, for example \f(CW\*(C`0d00ee,
ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1,
7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b\*(C'\fR.
.IP "\fBifo_palette\fR" 4
.IX Item "ifo_palette"
Specify the \s-1IFO\s0 file from which the global palette is obtained.
(experimental)
.IP "\fBforced_subs_only\fR" 4
.IX Item "forced_subs_only"
Only decode subtitle entries marked as forced. Some titles have forced
and non-forced subtitles in the same track. Setting this flag to \f(CW1\fR
will only keep the forced subtitles. Default value is \f(CW0\fR.
.SS "libzvbi-teletext"
.IX Subsection "libzvbi-teletext"
Libzvbi allows libavcodec to decode \s-1DVB\s0 teletext pages and \s-1DVB\s0 teletext
subtitles. Requires the presence of the libzvbi headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libzvbi\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBtxt_page\fR" 4
.IX Item "txt_page"
List of teletext page numbers to decode. Pages that do not match the specified
list are dropped. You may use the special \f(CW\*(C`*\*(C'\fR string to match all pages,
or \f(CW\*(C`subtitle\*(C'\fR to match all subtitle pages.
Default value is *.
.IP "\fBtxt_default_region\fR" 4
.IX Item "txt_default_region"
Set default character set used for decoding, a value between 0 and 87 (see
\&\s-1ETS 300 706,\s0 Section 15, Table 32). Default value is \-1, which does not
override the libzvbi default. This option is needed for some legacy level 1.0
transmissions which cannot signal the proper charset.
.IP "\fBtxt_chop_top\fR" 4
.IX Item "txt_chop_top"
Discards the top teletext line. Default value is 1.
.IP "\fBtxt_format\fR" 4
.IX Item "txt_format"
Specifies the format of the decoded subtitles.
.RS 4
.IP "\fBbitmap\fR" 4
.IX Item "bitmap"
The default format, you should use this for teletext pages, because certain
graphics and colors cannot be expressed in simple text or even \s-1ASS.\s0
.IP "\fBtext\fR" 4
.IX Item "text"
Simple text based output without formatting.
.IP "\fBass\fR" 4
.IX Item "ass"
Formatted \s-1ASS\s0 output, subtitle pages and teletext pages are returned in
different styles, subtitle pages are stripped down to text, but an effort is
made to keep the text alignment and the formatting.
.RE
.RS 4
.RE
.IP "\fBtxt_left\fR" 4
.IX Item "txt_left"
X offset of generated bitmaps, default is 0.
.IP "\fBtxt_top\fR" 4
.IX Item "txt_top"
Y offset of generated bitmaps, default is 0.
.IP "\fBtxt_chop_spaces\fR" 4
.IX Item "txt_chop_spaces"
Chops leading and trailing spaces and removes empty lines from the generated
text. This option is useful for teletext based subtitles where empty spaces may
be present at the start or at the end of the lines or empty lines may be
present between the subtitle lines because of double-sized teletext characters.
Default value is 1.
.IP "\fBtxt_duration\fR" 4
.IX Item "txt_duration"
Sets the display duration of the decoded teletext pages or subtitles in
milliseconds. Default value is \-1 which means infinity or until the next
subtitle event comes.
.IP "\fBtxt_transparent\fR" 4
.IX Item "txt_transparent"
Force transparent background of the generated teletext bitmaps. Default value
is 0 which means an opaque background.
.IP "\fBtxt_opacity\fR" 4
.IX Item "txt_opacity"
Sets the opacity (0\-255) of the teletext background. If
\&\fBtxt_transparent\fR is not set, it only affects characters between a start
box and an end box, typically subtitles. Default value is 0 if
\&\fBtxt_transparent\fR is set, 255 otherwise.
.SH "ENCODERS"
.IX Header "ENCODERS"
Encoders are configured elements in FFmpeg which allow the encoding of
multimedia streams.
.PP
When you configure your FFmpeg build, all the supported native encoders
are enabled by default. Encoders requiring an external library must be enabled
manually via the corresponding \f(CW\*(C`\-\-enable\-lib\*(C'\fR option. You can list all
available encoders using the configure option \f(CW\*(C`\-\-list\-encoders\*(C'\fR.
.PP
You can disable all the encoders with the configure option
\&\f(CW\*(C`\-\-disable\-encoders\*(C'\fR and selectively enable / disable single encoders
with the options \f(CW\*(C`\-\-enable\-encoder=\f(CIENCODER\f(CW\*(C'\fR /
\&\f(CW\*(C`\-\-disable\-encoder=\f(CIENCODER\f(CW\*(C'\fR.
.PP
The option \f(CW\*(C`\-encoders\*(C'\fR of the ff* tools will display the list of
enabled encoders.
.SH "AUDIO ENCODERS"
.IX Header "AUDIO ENCODERS"
A description of some of the currently available audio encoders
follows.
.SS "aac"
.IX Subsection "aac"
Advanced Audio Coding (\s-1AAC\s0) encoder.
.PP
This encoder is the default \s-1AAC\s0 encoder, natively implemented into FFmpeg.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBb\fR" 4
.IX Item "b"
Set bit rate in bits/s. Setting this automatically activates constant bit rate
(\s-1CBR\s0) mode. If this option is unspecified it is set to 128kbps.
.IP "\fBq\fR" 4
.IX Item "q"
Set quality for variable bit rate (\s-1VBR\s0) mode. This option is valid only using
the \fBffmpeg\fR command-line tool. For library interface users, use
\&\fBglobal_quality\fR.
.IP "\fBcutoff\fR" 4
.IX Item "cutoff"
Set cutoff frequency. If unspecified will allow the encoder to dynamically
adjust the cutoff to improve clarity on low bitrates.
.IP "\fBaac_coder\fR" 4
.IX Item "aac_coder"
Set \s-1AAC\s0 encoder coding method. Possible values:
.RS 4
.IP "\fBtwoloop\fR" 4
.IX Item "twoloop"
Two loop searching (\s-1TLS\s0) method.
.Sp
This method first sets quantizers depending on band thresholds and then tries
to find an optimal combination by adding or subtracting a specific value from
all quantizers and adjusting some individual quantizer a little.  Will tune
itself based on whether \fBaac_is\fR, \fBaac_ms\fR and \fBaac_pns\fR
are enabled.
.IP "\fBanmr\fR" 4
.IX Item "anmr"
Average noise to mask ratio (\s-1ANMR\s0) trellis-based solution.
.Sp
This is an experimental coder which currently produces a lower quality, is more
unstable and is slower than the default twoloop coder but has potential.
Currently has no support for the \fBaac_is\fR or \fBaac_pns\fR options.
Not currently recommended.
.IP "\fBfast\fR" 4
.IX Item "fast"
Constant quantizer method.
.Sp
Uses a cheaper version of twoloop algorithm that doesn't try to do as many
clever adjustments. Worse with low bitrates (less than 64kbps), but is better
and much faster at higher bitrates.
This is the default choice for a coder
.RE
.RS 4
.RE
.IP "\fBaac_ms\fR" 4
.IX Item "aac_ms"
Sets mid/side coding mode. The default value of \*(L"auto\*(R" will automatically use
M/S with bands which will benefit from such coding. Can be forced for all bands
using the value \*(L"enable\*(R", which is mainly useful for debugging or disabled using
\&\*(L"disable\*(R".
.IP "\fBaac_is\fR" 4
.IX Item "aac_is"
Sets intensity stereo coding tool usage. By default, it's enabled and will
automatically toggle \s-1IS\s0 for similar pairs of stereo bands if it's beneficial.
Can be disabled for debugging by setting the value to \*(L"disable\*(R".
.IP "\fBaac_pns\fR" 4
.IX Item "aac_pns"
Uses perceptual noise substitution to replace low entropy high frequency bands
with imperceptible white noise during the decoding process. By default, it's
enabled, but can be disabled for debugging purposes by using \*(L"disable\*(R".
.IP "\fBaac_tns\fR" 4
.IX Item "aac_tns"
Enables the use of a multitap \s-1FIR\s0 filter which spans through the high frequency
bands to hide quantization noise during the encoding process and is reverted
by the decoder. As well as decreasing unpleasant artifacts in the high range
this also reduces the entropy in the high bands and allows for more bits to
be used by the mid-low bands. By default it's enabled but can be disabled for
debugging by setting the option to \*(L"disable\*(R".
.IP "\fBaac_ltp\fR" 4
.IX Item "aac_ltp"
Enables the use of the long term prediction extension which increases coding
efficiency in very low bandwidth situations such as encoding of voice or
solo piano music by extending constant harmonic peaks in bands throughout
frames. This option is implied by profile:a aac_low and is incompatible with
aac_pred. Use in conjunction with \fB\-ar\fR to decrease the samplerate.
.IP "\fBaac_pred\fR" 4
.IX Item "aac_pred"
Enables the use of a more traditional style of prediction where the spectral
coefficients transmitted are replaced by the difference of the current
coefficients minus the previous \*(L"predicted\*(R" coefficients. In theory and sometimes
in practice this can improve quality for low to mid bitrate audio.
This option implies the aac_main profile and is incompatible with aac_ltp.
.IP "\fBprofile\fR" 4
.IX Item "profile"
Sets the encoding profile, possible values:
.RS 4
.IP "\fBaac_low\fR" 4
.IX Item "aac_low"
The default, \s-1AAC\s0 \*(L"Low-complexity\*(R" profile. Is the most compatible and produces
decent quality.
.IP "\fBmpeg2_aac_low\fR" 4
.IX Item "mpeg2_aac_low"
Equivalent to \f(CW\*(C`\-profile:a aac_low \-aac_pns 0\*(C'\fR. \s-1PNS\s0 was introduced with the
\&\s-1MPEG4\s0 specifications.
.IP "\fBaac_ltp\fR" 4
.IX Item "aac_ltp"
Long term prediction profile, is enabled by and will enable the \fBaac_ltp\fR
option. Introduced in \s-1MPEG4.\s0
.IP "\fBaac_main\fR" 4
.IX Item "aac_main"
Main-type prediction profile, is enabled by and will enable the \fBaac_pred\fR
option. Introduced in \s-1MPEG2.\s0
.RE
.RS 4
.Sp
If this option is unspecified it is set to \fBaac_low\fR.
.RE
.SS "ac3 and ac3_fixed"
.IX Subsection "ac3 and ac3_fixed"
\&\s-1AC\-3\s0 audio encoders.
.PP
These encoders implement part of \s-1ATSC A/52:2010\s0 and \s-1ETSI TS 102 366,\s0 as well as
the undocumented RealAudio 3 (a.k.a. dnet).
.PP
The \fIac3\fR encoder uses floating-point math, while the \fIac3_fixed\fR
encoder only uses fixed-point integer math. This does not mean that one is
always faster, just that one or the other may be better suited to a
particular system. The \fIac3_fixed\fR encoder is not the default codec for
any of the output formats, so it must be specified explicitly using the option
\&\f(CW\*(C`\-acodec ac3_fixed\*(C'\fR in order to use it.
.PP
\fI\s-1AC\-3\s0 Metadata\fR
.IX Subsection "AC-3 Metadata"
.PP
The \s-1AC\-3\s0 metadata options are used to set parameters that describe the audio,
but in most cases do not affect the audio encoding itself. Some of the options
do directly affect or influence the decoding and playback of the resulting
bitstream, while others are just for informational purposes. A few of the
options will add bits to the output stream that could otherwise be used for
audio data, and will thus affect the quality of the output. Those will be
indicated accordingly with a note in the option list below.
.PP
These parameters are described in detail in several publicly-available
documents.
.IP "*<<\fBhttp://www.atsc.org/cms/standards/a_52\-2010.pdf\fR>>" 4
.IX Item "*<<http://www.atsc.org/cms/standards/a_52-2010.pdf>>"
.PD 0
.IP "*<<\fBhttp://www.atsc.org/cms/standards/a_54a_with_corr_1.pdf\fR>>" 4
.IX Item "*<<http://www.atsc.org/cms/standards/a_54a_with_corr_1.pdf>>"
.IP "*<<\fBhttp://www.dolby.com/uploadedFiles/zz\-_Shared_Assets/English_PDFs/Professional/18_Metadata.Guide.pdf\fR>>" 4
.IX Item "*<<http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/18_Metadata.Guide.pdf>>"
.IP "*<<\fBhttp://www.dolby.com/uploadedFiles/zz\-_Shared_Assets/English_PDFs/Professional/46_DDEncodingGuidelines.pdf\fR>>" 4
.IX Item "*<<http://www.dolby.com/uploadedFiles/zz-_Shared_Assets/English_PDFs/Professional/46_DDEncodingGuidelines.pdf>>"
.PD
.PP
Metadata Control Options
.IX Subsection "Metadata Control Options"
.IP "\fB\-per_frame_metadata\fR \fIboolean\fR" 4
.IX Item "-per_frame_metadata boolean"
Allow Per-Frame Metadata. Specifies if the encoder should check for changing
metadata for each frame.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
The metadata values set at initialization will be used for every frame in the
stream. (default)
.IP "\fB1\fR" 4
.IX Item "1"
Metadata values can be changed before encoding each frame.
.RE
.RS 4
.RE
.PP
Downmix Levels
.IX Subsection "Downmix Levels"
.IP "\fB\-center_mixlev\fR \fIlevel\fR" 4
.IX Item "-center_mixlev level"
Center Mix Level. The amount of gain the decoder should apply to the center
channel when downmixing to stereo. This field will only be written to the
bitstream if a center channel is present. The value is specified as a scale
factor. There are 3 valid values:
.RS 4
.IP "\fB0.707\fR" 4
.IX Item "0.707"
Apply \-3dB gain
.IP "\fB0.595\fR" 4
.IX Item "0.595"
Apply \-4.5dB gain (default)
.IP "\fB0.500\fR" 4
.IX Item "0.500"
Apply \-6dB gain
.RE
.RS 4
.RE
.IP "\fB\-surround_mixlev\fR \fIlevel\fR" 4
.IX Item "-surround_mixlev level"
Surround Mix Level. The amount of gain the decoder should apply to the surround
channel(s) when downmixing to stereo. This field will only be written to the
bitstream if one or more surround channels are present. The value is specified
as a scale factor.  There are 3 valid values:
.RS 4
.IP "\fB0.707\fR" 4
.IX Item "0.707"
Apply \-3dB gain
.IP "\fB0.500\fR" 4
.IX Item "0.500"
Apply \-6dB gain (default)
.IP "\fB0.000\fR" 4
.IX Item "0.000"
Silence Surround Channel(s)
.RE
.RS 4
.RE
.PP
Audio Production Information
.IX Subsection "Audio Production Information"
.PP
Audio Production Information is optional information describing the mixing
environment.  Either none or both of the fields are written to the bitstream.
.IP "\fB\-mixing_level\fR \fInumber\fR" 4
.IX Item "-mixing_level number"
Mixing Level. Specifies peak sound pressure level (\s-1SPL\s0) in the production
environment when the mix was mastered. Valid values are 80 to 111, or \-1 for
unknown or not indicated. The default value is \-1, but that value cannot be
used if the Audio Production Information is written to the bitstream. Therefore,
if the \f(CW\*(C`room_type\*(C'\fR option is not the default value, the \f(CW\*(C`mixing_level\*(C'\fR
option must not be \-1.
.IP "\fB\-room_type\fR \fItype\fR" 4
.IX Item "-room_type type"
Room Type. Describes the equalization used during the final mixing session at
the studio or on the dubbing stage. A large room is a dubbing stage with the
industry standard X\-curve equalization; a small room has flat equalization.
This field will not be written to the bitstream if both the \f(CW\*(C`mixing_level\*(C'\fR
option and the \f(CW\*(C`room_type\*(C'\fR option have the default values.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBnotindicated\fR" 4
.IX Item "notindicated"
.PD
Not Indicated (default)
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBlarge\fR" 4
.IX Item "large"
.PD
Large Room
.IP "\fB2\fR" 4
.IX Item "2"
.PD 0
.IP "\fBsmall\fR" 4
.IX Item "small"
.PD
Small Room
.RE
.RS 4
.RE
.PP
Other Metadata Options
.IX Subsection "Other Metadata Options"
.IP "\fB\-copyright\fR \fIboolean\fR" 4
.IX Item "-copyright boolean"
Copyright Indicator. Specifies whether a copyright exists for this audio.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBoff\fR" 4
.IX Item "off"
.PD
No Copyright Exists (default)
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBon\fR" 4
.IX Item "on"
.PD
Copyright Exists
.RE
.RS 4
.RE
.IP "\fB\-dialnorm\fR \fIvalue\fR" 4
.IX Item "-dialnorm value"
Dialogue Normalization. Indicates how far the average dialogue level of the
program is below digital 100% full scale (0 dBFS). This parameter determines a
level shift during audio reproduction that sets the average volume of the
dialogue to a preset level. The goal is to match volume level between program
sources. A value of \-31dB will result in no volume level change, relative to
the source volume, during audio reproduction. Valid values are whole numbers in
the range \-31 to \-1, with \-31 being the default.
.IP "\fB\-dsur_mode\fR \fImode\fR" 4
.IX Item "-dsur_mode mode"
Dolby Surround Mode. Specifies whether the stereo signal uses Dolby Surround
(Pro Logic). This field will only be written to the bitstream if the audio
stream is stereo. Using this option does \fB\s-1NOT\s0\fR mean the encoder will actually
apply Dolby Surround processing.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBnotindicated\fR" 4
.IX Item "notindicated"
.PD
Not Indicated (default)
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBoff\fR" 4
.IX Item "off"
.PD
Not Dolby Surround Encoded
.IP "\fB2\fR" 4
.IX Item "2"
.PD 0
.IP "\fBon\fR" 4
.IX Item "on"
.PD
Dolby Surround Encoded
.RE
.RS 4
.RE
.IP "\fB\-original\fR \fIboolean\fR" 4
.IX Item "-original boolean"
Original Bit Stream Indicator. Specifies whether this audio is from the
original source and not a copy.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBoff\fR" 4
.IX Item "off"
.PD
Not Original Source
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBon\fR" 4
.IX Item "on"
.PD
Original Source (default)
.RE
.RS 4
.RE
.PP
\fIExtended Bitstream Information\fR
.IX Subsection "Extended Bitstream Information"
.PP
The extended bitstream options are part of the Alternate Bit Stream Syntax as
specified in Annex D of the A/52:2010 standard. It is grouped into 2 parts.
If any one parameter in a group is specified, all values in that group will be
written to the bitstream.  Default values are used for those that are written
but have not been specified.  If the mixing levels are written, the decoder
will use these values instead of the ones specified in the \f(CW\*(C`center_mixlev\*(C'\fR
and \f(CW\*(C`surround_mixlev\*(C'\fR options if it supports the Alternate Bit Stream
Syntax.
.PP
Extended Bitstream Information \- Part 1
.IX Subsection "Extended Bitstream Information - Part 1"
.IP "\fB\-dmix_mode\fR \fImode\fR" 4
.IX Item "-dmix_mode mode"
Preferred Stereo Downmix Mode. Allows the user to select either Lt/Rt
(Dolby Surround) or Lo/Ro (normal stereo) as the preferred stereo downmix mode.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBnotindicated\fR" 4
.IX Item "notindicated"
.PD
Not Indicated (default)
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBltrt\fR" 4
.IX Item "ltrt"
.PD
Lt/Rt Downmix Preferred
.IP "\fB2\fR" 4
.IX Item "2"
.PD 0
.IP "\fBloro\fR" 4
.IX Item "loro"
.PD
Lo/Ro Downmix Preferred
.RE
.RS 4
.RE
.IP "\fB\-ltrt_cmixlev\fR \fIlevel\fR" 4
.IX Item "-ltrt_cmixlev level"
Lt/Rt Center Mix Level. The amount of gain the decoder should apply to the
center channel when downmixing to stereo in Lt/Rt mode.
.RS 4
.IP "\fB1.414\fR" 4
.IX Item "1.414"
Apply +3dB gain
.IP "\fB1.189\fR" 4
.IX Item "1.189"
Apply +1.5dB gain
.IP "\fB1.000\fR" 4
.IX Item "1.000"
Apply 0dB gain
.IP "\fB0.841\fR" 4
.IX Item "0.841"
Apply \-1.5dB gain
.IP "\fB0.707\fR" 4
.IX Item "0.707"
Apply \-3.0dB gain
.IP "\fB0.595\fR" 4
.IX Item "0.595"
Apply \-4.5dB gain (default)
.IP "\fB0.500\fR" 4
.IX Item "0.500"
Apply \-6.0dB gain
.IP "\fB0.000\fR" 4
.IX Item "0.000"
Silence Center Channel
.RE
.RS 4
.RE
.IP "\fB\-ltrt_surmixlev\fR \fIlevel\fR" 4
.IX Item "-ltrt_surmixlev level"
Lt/Rt Surround Mix Level. The amount of gain the decoder should apply to the
surround channel(s) when downmixing to stereo in Lt/Rt mode.
.RS 4
.IP "\fB0.841\fR" 4
.IX Item "0.841"
Apply \-1.5dB gain
.IP "\fB0.707\fR" 4
.IX Item "0.707"
Apply \-3.0dB gain
.IP "\fB0.595\fR" 4
.IX Item "0.595"
Apply \-4.5dB gain
.IP "\fB0.500\fR" 4
.IX Item "0.500"
Apply \-6.0dB gain (default)
.IP "\fB0.000\fR" 4
.IX Item "0.000"
Silence Surround Channel(s)
.RE
.RS 4
.RE
.IP "\fB\-loro_cmixlev\fR \fIlevel\fR" 4
.IX Item "-loro_cmixlev level"
Lo/Ro Center Mix Level. The amount of gain the decoder should apply to the
center channel when downmixing to stereo in Lo/Ro mode.
.RS 4
.IP "\fB1.414\fR" 4
.IX Item "1.414"
Apply +3dB gain
.IP "\fB1.189\fR" 4
.IX Item "1.189"
Apply +1.5dB gain
.IP "\fB1.000\fR" 4
.IX Item "1.000"
Apply 0dB gain
.IP "\fB0.841\fR" 4
.IX Item "0.841"
Apply \-1.5dB gain
.IP "\fB0.707\fR" 4
.IX Item "0.707"
Apply \-3.0dB gain
.IP "\fB0.595\fR" 4
.IX Item "0.595"
Apply \-4.5dB gain (default)
.IP "\fB0.500\fR" 4
.IX Item "0.500"
Apply \-6.0dB gain
.IP "\fB0.000\fR" 4
.IX Item "0.000"
Silence Center Channel
.RE
.RS 4
.RE
.IP "\fB\-loro_surmixlev\fR \fIlevel\fR" 4
.IX Item "-loro_surmixlev level"
Lo/Ro Surround Mix Level. The amount of gain the decoder should apply to the
surround channel(s) when downmixing to stereo in Lo/Ro mode.
.RS 4
.IP "\fB0.841\fR" 4
.IX Item "0.841"
Apply \-1.5dB gain
.IP "\fB0.707\fR" 4
.IX Item "0.707"
Apply \-3.0dB gain
.IP "\fB0.595\fR" 4
.IX Item "0.595"
Apply \-4.5dB gain
.IP "\fB0.500\fR" 4
.IX Item "0.500"
Apply \-6.0dB gain (default)
.IP "\fB0.000\fR" 4
.IX Item "0.000"
Silence Surround Channel(s)
.RE
.RS 4
.RE
.PP
Extended Bitstream Information \- Part 2
.IX Subsection "Extended Bitstream Information - Part 2"
.IP "\fB\-dsurex_mode\fR \fImode\fR" 4
.IX Item "-dsurex_mode mode"
Dolby Surround \s-1EX\s0 Mode. Indicates whether the stream uses Dolby Surround \s-1EX\s0
(7.1 matrixed to 5.1). Using this option does \fB\s-1NOT\s0\fR mean the encoder will actually
apply Dolby Surround \s-1EX\s0 processing.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBnotindicated\fR" 4
.IX Item "notindicated"
.PD
Not Indicated (default)
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBon\fR" 4
.IX Item "on"
.PD
Dolby Surround \s-1EX\s0 Off
.IP "\fB2\fR" 4
.IX Item "2"
.PD 0
.IP "\fBoff\fR" 4
.IX Item "off"
.PD
Dolby Surround \s-1EX\s0 On
.RE
.RS 4
.RE
.IP "\fB\-dheadphone_mode\fR \fImode\fR" 4
.IX Item "-dheadphone_mode mode"
Dolby Headphone Mode. Indicates whether the stream uses Dolby Headphone
encoding (multi-channel matrixed to 2.0 for use with headphones). Using this
option does \fB\s-1NOT\s0\fR mean the encoder will actually apply Dolby Headphone
processing.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBnotindicated\fR" 4
.IX Item "notindicated"
.PD
Not Indicated (default)
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBon\fR" 4
.IX Item "on"
.PD
Dolby Headphone Off
.IP "\fB2\fR" 4
.IX Item "2"
.PD 0
.IP "\fBoff\fR" 4
.IX Item "off"
.PD
Dolby Headphone On
.RE
.RS 4
.RE
.IP "\fB\-ad_conv_type\fR \fItype\fR" 4
.IX Item "-ad_conv_type type"
A/D Converter Type. Indicates whether the audio has passed through \s-1HDCD A/D\s0
conversion.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBstandard\fR" 4
.IX Item "standard"
.PD
Standard A/D Converter (default)
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBhdcd\fR" 4
.IX Item "hdcd"
.PD
\&\s-1HDCD A/D\s0 Converter
.RE
.RS 4
.RE
.PP
\fIOther \s-1AC\-3\s0 Encoding Options\fR
.IX Subsection "Other AC-3 Encoding Options"
.IP "\fB\-stereo_rematrixing\fR \fIboolean\fR" 4
.IX Item "-stereo_rematrixing boolean"
Stereo Rematrixing. Enables/Disables use of rematrixing for stereo input. This
is an optional \s-1AC\-3\s0 feature that increases quality by selectively encoding
the left/right channels as mid/side. This option is enabled by default, and it
is highly recommended that it be left as enabled except for testing purposes.
.IP "\fBcutoff\fR \fIfrequency\fR" 4
.IX Item "cutoff frequency"
Set lowpass cutoff frequency. If unspecified, the encoder selects a default
determined by various other encoding parameters.
.PP
\fIFloating-Point-Only \s-1AC\-3\s0 Encoding Options\fR
.IX Subsection "Floating-Point-Only AC-3 Encoding Options"
.PP
These options are only valid for the floating-point encoder and do not exist
for the fixed-point encoder due to the corresponding features not being
implemented in fixed-point.
.IP "\fB\-channel_coupling\fR \fIboolean\fR" 4
.IX Item "-channel_coupling boolean"
Enables/Disables use of channel coupling, which is an optional \s-1AC\-3\s0 feature
that increases quality by combining high frequency information from multiple
channels into a single channel. The per-channel high frequency information is
sent with less accuracy in both the frequency and time domains. This allows
more bits to be used for lower frequencies while preserving enough information
to reconstruct the high frequencies. This option is enabled by default for the
floating-point encoder and should generally be left as enabled except for
testing purposes or to increase encoding speed.
.RS 4
.IP "\fB\-1\fR" 4
.IX Item "-1"
.PD 0
.IP "\fBauto\fR" 4
.IX Item "auto"
.PD
Selected by Encoder (default)
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBoff\fR" 4
.IX Item "off"
.PD
Disable Channel Coupling
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBon\fR" 4
.IX Item "on"
.PD
Enable Channel Coupling
.RE
.RS 4
.RE
.IP "\fB\-cpl_start_band\fR \fInumber\fR" 4
.IX Item "-cpl_start_band number"
Coupling Start Band. Sets the channel coupling start band, from 1 to 15. If a
value higher than the bandwidth is used, it will be reduced to 1 less than the
coupling end band. If \fIauto\fR is used, the start band will be determined by
the encoder based on the bit rate, sample rate, and channel layout. This option
has no effect if channel coupling is disabled.
.RS 4
.IP "\fB\-1\fR" 4
.IX Item "-1"
.PD 0
.IP "\fBauto\fR" 4
.IX Item "auto"
.PD
Selected by Encoder (default)
.RE
.RS 4
.RE
.SS "flac"
.IX Subsection "flac"
\&\s-1FLAC\s0 (Free Lossless Audio Codec) Encoder
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are supported by FFmpeg's flac encoder.
.IP "\fBcompression_level\fR" 4
.IX Item "compression_level"
Sets the compression level, which chooses defaults for many other options
if they are not set explicitly. Valid values are from 0 to 12, 5 is the
default.
.IP "\fBframe_size\fR" 4
.IX Item "frame_size"
Sets the size of the frames in samples per channel.
.IP "\fBlpc_coeff_precision\fR" 4
.IX Item "lpc_coeff_precision"
Sets the \s-1LPC\s0 coefficient precision, valid values are from 1 to 15, 15 is the
default.
.IP "\fBlpc_type\fR" 4
.IX Item "lpc_type"
Sets the first stage \s-1LPC\s0 algorithm
.RS 4
.IP "\fBnone\fR" 4
.IX Item "none"
\&\s-1LPC\s0 is not used
.IP "\fBfixed\fR" 4
.IX Item "fixed"
fixed \s-1LPC\s0 coefficients
.IP "\fBlevinson\fR" 4
.IX Item "levinson"
.PD 0
.IP "\fBcholesky\fR" 4
.IX Item "cholesky"
.RE
.RS 4
.RE
.IP "\fBlpc_passes\fR" 4
.IX Item "lpc_passes"
.PD
Number of passes to use for Cholesky factorization during \s-1LPC\s0 analysis
.IP "\fBmin_partition_order\fR" 4
.IX Item "min_partition_order"
The minimum partition order
.IP "\fBmax_partition_order\fR" 4
.IX Item "max_partition_order"
The maximum partition order
.IP "\fBprediction_order_method\fR" 4
.IX Item "prediction_order_method"
.RS 4
.PD 0
.IP "\fBestimation\fR" 4
.IX Item "estimation"
.IP "\fB2level\fR" 4
.IX Item "2level"
.IP "\fB4level\fR" 4
.IX Item "4level"
.IP "\fB8level\fR" 4
.IX Item "8level"
.IP "\fBsearch\fR" 4
.IX Item "search"
.PD
Bruteforce search
.IP "\fBlog\fR" 4
.IX Item "log"
.RE
.RS 4
.RE
.PD 0
.IP "\fBch_mode\fR" 4
.IX Item "ch_mode"
.PD
Channel mode
.RS 4
.IP "\fBauto\fR" 4
.IX Item "auto"
The mode is chosen automatically for each frame
.IP "\fBindep\fR" 4
.IX Item "indep"
Channels are independently coded
.IP "\fBleft_side\fR" 4
.IX Item "left_side"
.PD 0
.IP "\fBright_side\fR" 4
.IX Item "right_side"
.IP "\fBmid_side\fR" 4
.IX Item "mid_side"
.RE
.RS 4
.RE
.IP "\fBexact_rice_parameters\fR" 4
.IX Item "exact_rice_parameters"
.PD
Chooses if rice parameters are calculated exactly or approximately.
if set to 1 then they are chosen exactly, which slows the code down slightly and
improves compression slightly.
.IP "\fBmulti_dim_quant\fR" 4
.IX Item "multi_dim_quant"
Multi Dimensional Quantization. If set to 1 then a 2nd stage \s-1LPC\s0 algorithm is
applied after the first stage to finetune the coefficients. This is quite slow
and slightly improves compression.
.SS "opus"
.IX Subsection "opus"
Opus encoder.
.PP
This is a native FFmpeg encoder for the Opus format. Currently its in development and
only implements the \s-1CELT\s0 part of the codec. Its quality is usually worse and at best
is equal to the libopus encoder.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBb\fR" 4
.IX Item "b"
Set bit rate in bits/s. If unspecified it uses the number of channels and the layout
to make a good guess.
.IP "\fBopus_delay\fR" 4
.IX Item "opus_delay"
Sets the maximum delay in milliseconds. Lower delays than 20ms will very quickly
decrease quality.
.SS "libfdk_aac"
.IX Subsection "libfdk_aac"
libfdk-aac \s-1AAC\s0 (Advanced Audio Coding) encoder wrapper.
.PP
The libfdk-aac library is based on the Fraunhofer \s-1FDK AAC\s0 code from
the Android project.
.PP
Requires the presence of the libfdk-aac headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libfdk\-aac\*(C'\fR. The library is also incompatible with \s-1GPL,\s0
so if you allow the use of \s-1GPL,\s0 you should configure with
\&\f(CW\*(C`\-\-enable\-gpl \-\-enable\-nonfree \-\-enable\-libfdk\-aac\*(C'\fR.
.PP
This encoder has support for the AAC-HE profiles.
.PP
\&\s-1VBR\s0 encoding, enabled through the \fBvbr\fR or \fBflags
+qscale\fR options, is experimental and only works with some
combinations of parameters.
.PP
Support for encoding 7.1 audio is only available with libfdk-aac 0.1.3 or
higher.
.PP
For more information see the fdk-aac project at
<\fBhttp://sourceforge.net/p/opencore\-amr/fdk\-aac/\fR>.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are mapped on the shared FFmpeg codec options.
.IP "\fBb\fR" 4
.IX Item "b"
Set bit rate in bits/s. If the bitrate is not explicitly specified, it
is automatically set to a suitable value depending on the selected
profile.
.Sp
In case \s-1VBR\s0 mode is enabled the option is ignored.
.IP "\fBar\fR" 4
.IX Item "ar"
Set audio sampling rate (in Hz).
.IP "\fBchannels\fR" 4
.IX Item "channels"
Set the number of audio channels.
.IP "\fBflags +qscale\fR" 4
.IX Item "flags +qscale"
Enable fixed quality, \s-1VBR\s0 (Variable Bit Rate) mode.
Note that \s-1VBR\s0 is implicitly enabled when the \fBvbr\fR value is
positive.
.IP "\fBcutoff\fR" 4
.IX Item "cutoff"
Set cutoff frequency. If not specified (or explicitly set to 0) it
will use a value automatically computed by the library. Default value
is 0.
.IP "\fBprofile\fR" 4
.IX Item "profile"
Set audio profile.
.Sp
The following profiles are recognized:
.RS 4
.IP "\fBaac_low\fR" 4
.IX Item "aac_low"
Low Complexity \s-1AAC\s0 (\s-1LC\s0)
.IP "\fBaac_he\fR" 4
.IX Item "aac_he"
High Efficiency \s-1AAC\s0 (HE-AAC)
.IP "\fBaac_he_v2\fR" 4
.IX Item "aac_he_v2"
High Efficiency \s-1AAC\s0 version 2 (HE\-AACv2)
.IP "\fBaac_ld\fR" 4
.IX Item "aac_ld"
Low Delay \s-1AAC\s0 (\s-1LD\s0)
.IP "\fBaac_eld\fR" 4
.IX Item "aac_eld"
Enhanced Low Delay \s-1AAC\s0 (\s-1ELD\s0)
.RE
.RS 4
.Sp
If not specified it is set to \fBaac_low\fR.
.RE
.PP
The following are private options of the libfdk_aac encoder.
.IP "\fBafterburner\fR" 4
.IX Item "afterburner"
Enable afterburner feature if set to 1, disabled if set to 0. This
improves the quality but also the required processing power.
.Sp
Default value is 1.
.IP "\fBeld_sbr\fR" 4
.IX Item "eld_sbr"
Enable \s-1SBR\s0 (Spectral Band Replication) for \s-1ELD\s0 if set to 1, disabled
if set to 0.
.Sp
Default value is 0.
.IP "\fBeld_v2\fR" 4
.IX Item "eld_v2"
Enable ELDv2 (LD-MPS extension for \s-1ELD\s0 stereo signals) for ELDv2 if set to 1,
disabled if set to 0.
.Sp
Note that option is available when fdk-aac version (\s-1AACENCODER_LIB_VL0.AACENCODER_LIB_VL1.AACENCODER_LIB_VL2\s0) > (4.0.0).
.Sp
Default value is 0.
.IP "\fBsignaling\fR" 4
.IX Item "signaling"
Set \s-1SBR/PS\s0 signaling style.
.Sp
It can assume one of the following values:
.RS 4
.IP "\fBdefault\fR" 4
.IX Item "default"
choose signaling implicitly (explicit hierarchical by default,
implicit if global header is disabled)
.IP "\fBimplicit\fR" 4
.IX Item "implicit"
implicit backwards compatible signaling
.IP "\fBexplicit_sbr\fR" 4
.IX Item "explicit_sbr"
explicit \s-1SBR,\s0 implicit \s-1PS\s0 signaling
.IP "\fBexplicit_hierarchical\fR" 4
.IX Item "explicit_hierarchical"
explicit hierarchical signaling
.RE
.RS 4
.Sp
Default value is \fBdefault\fR.
.RE
.IP "\fBlatm\fR" 4
.IX Item "latm"
Output \s-1LATM/LOAS\s0 encapsulated data if set to 1, disabled if set to 0.
.Sp
Default value is 0.
.IP "\fBheader_period\fR" 4
.IX Item "header_period"
Set StreamMuxConfig and \s-1PCE\s0 repetition period (in frames) for sending
in-band configuration buffers within \s-1LATM/LOAS\s0 transport layer.
.Sp
Must be a 16\-bits non-negative integer.
.Sp
Default value is 0.
.IP "\fBvbr\fR" 4
.IX Item "vbr"
Set \s-1VBR\s0 mode, from 1 to 5. 1 is lowest quality (though still pretty
good) and 5 is highest quality. A value of 0 will disable \s-1VBR,\s0 and \s-1CBR\s0
(Constant Bit Rate) is enabled.
.Sp
Currently only the \fBaac_low\fR profile supports \s-1VBR\s0 encoding.
.Sp
\&\s-1VBR\s0 modes 1\-5 correspond to roughly the following average bit rates:
.RS 4
.IP "\fB1\fR" 4
.IX Item "1"
32 kbps/channel
.IP "\fB2\fR" 4
.IX Item "2"
40 kbps/channel
.IP "\fB3\fR" 4
.IX Item "3"
48\-56 kbps/channel
.IP "\fB4\fR" 4
.IX Item "4"
64 kbps/channel
.IP "\fB5\fR" 4
.IX Item "5"
about 80\-96 kbps/channel
.RE
.RS 4
.Sp
Default value is 0.
.RE
.PP
\fIExamples\fR
.IX Subsection "Examples"
.IP "\(bu" 4
Use \fBffmpeg\fR to convert an audio file to \s-1VBR AAC\s0 in an M4A (\s-1MP4\s0)
container:
.Sp
.Vb 1
\&        ffmpeg \-i input.wav \-codec:a libfdk_aac \-vbr 3 output.m4a
.Ve
.IP "\(bu" 4
Use \fBffmpeg\fR to convert an audio file to \s-1CBR\s0 64k kbps \s-1AAC,\s0 using the
High-Efficiency \s-1AAC\s0 profile:
.Sp
.Vb 1
\&        ffmpeg \-i input.wav \-c:a libfdk_aac \-profile:a aac_he \-b:a 64k output.m4a
.Ve
.SS "libmp3lame"
.IX Subsection "libmp3lame"
\&\s-1LAME\s0 (Lame Ain't an \s-1MP3\s0 Encoder) \s-1MP3\s0 encoder wrapper.
.PP
Requires the presence of the libmp3lame headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libmp3lame\*(C'\fR.
.PP
See \fBlibshine\fR for a fixed-point \s-1MP3\s0 encoder, although with a
lower quality.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are supported by the libmp3lame wrapper. The
\&\fBlame\fR\-equivalent of the options are listed in parentheses.
.IP "\fBb (\fR\fI\-b\fR\fB)\fR" 4
.IX Item "b (-b)"
Set bitrate expressed in bits/s for \s-1CBR\s0 or \s-1ABR. LAME\s0 \f(CW\*(C`bitrate\*(C'\fR is
expressed in kilobits/s.
.IP "\fBq (\fR\fI\-V\fR\fB)\fR" 4
.IX Item "q (-V)"
Set constant quality setting for \s-1VBR.\s0 This option is valid only
using the \fBffmpeg\fR command-line tool. For library interface
users, use \fBglobal_quality\fR.
.IP "\fBcompression_level (\fR\fI\-q\fR\fB)\fR" 4
.IX Item "compression_level (-q)"
Set algorithm quality. Valid arguments are integers in the 0\-9 range,
with 0 meaning highest quality but slowest, and 9 meaning fastest
while producing the worst quality.
.IP "\fBcutoff (\fR\fI\-\-lowpass\fR\fB)\fR" 4
.IX Item "cutoff (--lowpass)"
Set lowpass cutoff frequency. If unspecified, the encoder dynamically
adjusts the cutoff.
.IP "\fBreservoir\fR" 4
.IX Item "reservoir"
Enable use of bit reservoir when set to 1. Default value is 1. \s-1LAME\s0
has this enabled by default, but can be overridden by use
\&\fB\-\-nores\fR option.
.IP "\fBjoint_stereo (\fR\fI\-m j\fR\fB)\fR" 4
.IX Item "joint_stereo (-m j)"
Enable the encoder to use (on a frame by frame basis) either L/R
stereo or mid/side stereo. Default value is 1.
.IP "\fBabr (\fR\fI\-\-abr\fR\fB)\fR" 4
.IX Item "abr (--abr)"
Enable the encoder to use \s-1ABR\s0 when set to 1. The \fBlame\fR
\&\fB\-\-abr\fR sets the target bitrate, while this options only
tells FFmpeg to use \s-1ABR\s0 still relies on \fBb\fR to set bitrate.
.SS "libopencore-amrnb"
.IX Subsection "libopencore-amrnb"
OpenCORE Adaptive Multi-Rate Narrowband encoder.
.PP
Requires the presence of the libopencore-amrnb headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libopencore\-amrnb \-\-enable\-version3\*(C'\fR.
.PP
This is a mono-only encoder. Officially it only supports 8000Hz sample rate,
but you can override it by setting \fBstrict\fR to \fBunofficial\fR or
lower.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBb\fR" 4
.IX Item "b"
Set bitrate in bits per second. Only the following bitrates are supported,
otherwise libavcodec will round to the nearest valid bitrate.
.RS 4
.IP "\fB4750\fR" 4
.IX Item "4750"
.PD 0
.IP "\fB5150\fR" 4
.IX Item "5150"
.IP "\fB5900\fR" 4
.IX Item "5900"
.IP "\fB6700\fR" 4
.IX Item "6700"
.IP "\fB7400\fR" 4
.IX Item "7400"
.IP "\fB7950\fR" 4
.IX Item "7950"
.IP "\fB10200\fR" 4
.IX Item "10200"
.IP "\fB12200\fR" 4
.IX Item "12200"
.RE
.RS 4
.RE
.IP "\fBdtx\fR" 4
.IX Item "dtx"
.PD
Allow discontinuous transmission (generate comfort noise) when set to 1. The
default value is 0 (disabled).
.SS "libopus"
.IX Subsection "libopus"
libopus Opus Interactive Audio Codec encoder wrapper.
.PP
Requires the presence of the libopus headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libopus\*(C'\fR.
.PP
\fIOption Mapping\fR
.IX Subsection "Option Mapping"
.PP
Most libopus options are modelled after the \fBopusenc\fR utility from
opus-tools. The following is an option mapping chart describing options
supported by the libopus wrapper, and their \fBopusenc\fR\-equivalent
in parentheses.
.IP "\fBb (\fR\fIbitrate\fR\fB)\fR" 4
.IX Item "b (bitrate)"
Set the bit rate in bits/s.  FFmpeg's \fBb\fR option is
expressed in bits/s, while \fBopusenc\fR's \fBbitrate\fR in
kilobits/s.
.IP "\fBvbr (\fR\fIvbr\fR\fB,\fR \fIhard-cbr\fR\fB, and\fR \fIcvbr\fR\fB)\fR" 4
.IX Item "vbr (vbr, hard-cbr, and cvbr)"
Set \s-1VBR\s0 mode. The FFmpeg \fBvbr\fR option has the following
valid arguments, with the \fBopusenc\fR equivalent options
in parentheses:
.RS 4
.IP "\fBoff (\fR\fIhard-cbr\fR\fB)\fR" 4
.IX Item "off (hard-cbr)"
Use constant bit rate encoding.
.IP "\fBon (\fR\fIvbr\fR\fB)\fR" 4
.IX Item "on (vbr)"
Use variable bit rate encoding (the default).
.IP "\fBconstrained (\fR\fIcvbr\fR\fB)\fR" 4
.IX Item "constrained (cvbr)"
Use constrained variable bit rate encoding.
.RE
.RS 4
.RE
.IP "\fBcompression_level (\fR\fIcomp\fR\fB)\fR" 4
.IX Item "compression_level (comp)"
Set encoding algorithm complexity. Valid options are integers in
the 0\-10 range. 0 gives the fastest encodes but lower quality, while 10
gives the highest quality but slowest encoding. The default is 10.
.IP "\fBframe_duration (\fR\fIframesize\fR\fB)\fR" 4
.IX Item "frame_duration (framesize)"
Set maximum frame size, or duration of a frame in milliseconds. The
argument must be exactly the following: 2.5, 5, 10, 20, 40, 60. Smaller
frame sizes achieve lower latency but less quality at a given bitrate.
Sizes greater than 20ms are only interesting at fairly low bitrates.
The default is 20ms.
.IP "\fBpacket_loss (\fR\fIexpect-loss\fR\fB)\fR" 4
.IX Item "packet_loss (expect-loss)"
Set expected packet loss percentage. The default is 0.
.IP "\fBfec (\fR\fIn/a\fR\fB)\fR" 4
.IX Item "fec (n/a)"
Enable inband forward error correction. \fBpacket_loss\fR must be non-zero
to take advantage \- frequency of \s-1FEC\s0 'side\-data' is proportional to expected packet loss.
Default is disabled.
.IP "\fBapplication (N.A.)\fR" 4
.IX Item "application (N.A.)"
Set intended application type. Valid options are listed below:
.RS 4
.IP "\fBvoip\fR" 4
.IX Item "voip"
Favor improved speech intelligibility.
.IP "\fBaudio\fR" 4
.IX Item "audio"
Favor faithfulness to the input (the default).
.IP "\fBlowdelay\fR" 4
.IX Item "lowdelay"
Restrict to only the lowest delay modes.
.RE
.RS 4
.RE
.IP "\fBcutoff (N.A.)\fR" 4
.IX Item "cutoff (N.A.)"
Set cutoff bandwidth in Hz. The argument must be exactly one of the
following: 4000, 6000, 8000, 12000, or 20000, corresponding to
narrowband, mediumband, wideband, super wideband, and fullband
respectively. The default is 0 (cutoff disabled).
.IP "\fBmapping_family (\fR\fImapping_family\fR\fB)\fR" 4
.IX Item "mapping_family (mapping_family)"
Set channel mapping family to be used by the encoder. The default value of \-1
uses mapping family 0 for mono and stereo inputs, and mapping family 1
otherwise. The default also disables the surround masking and \s-1LFE\s0 bandwidth
optimzations in libopus, and requires that the input contains 8 channels or
fewer.
.Sp
Other values include 0 for mono and stereo, 1 for surround sound with masking
and \s-1LFE\s0 bandwidth optimizations, and 255 for independent streams with an
unspecified channel layout.
.IP "\fBapply_phase_inv (N.A.) (requires libopus >= 1.2)\fR" 4
.IX Item "apply_phase_inv (N.A.) (requires libopus >= 1.2)"
If set to 0, disables the use of phase inversion for intensity stereo,
improving the quality of mono downmixes, but slightly reducing normal stereo
quality. The default is 1 (phase inversion enabled).
.SS "libshine"
.IX Subsection "libshine"
Shine Fixed-Point \s-1MP3\s0 encoder wrapper.
.PP
Shine is a fixed-point \s-1MP3\s0 encoder. It has a far better performance on
platforms without an \s-1FPU,\s0 e.g. armel CPUs, and some phones and tablets.
However, as it is more targeted on performance than quality, it is not on par
with \s-1LAME\s0 and other production-grade encoders quality-wise. Also, according to
the project's homepage, this encoder may not be free of bugs as the code was
written a long time ago and the project was dead for at least 5 years.
.PP
This encoder only supports stereo and mono input. This is also CBR-only.
.PP
The original project (last updated in early 2007) is at
<\fBhttp://sourceforge.net/projects/libshine\-fxp/\fR>. We only support the
updated fork by the Savonet/Liquidsoap project at <\fBhttps://github.com/savonet/shine\fR>.
.PP
Requires the presence of the libshine headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libshine\*(C'\fR.
.PP
See also \fBlibmp3lame\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are supported by the libshine wrapper. The
\&\fBshineenc\fR\-equivalent of the options are listed in parentheses.
.IP "\fBb (\fR\fI\-b\fR\fB)\fR" 4
.IX Item "b (-b)"
Set bitrate expressed in bits/s for \s-1CBR.\s0 \fBshineenc\fR \fB\-b\fR option
is expressed in kilobits/s.
.SS "libtwolame"
.IX Subsection "libtwolame"
TwoLAME \s-1MP2\s0 encoder wrapper.
.PP
Requires the presence of the libtwolame headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libtwolame\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are supported by the libtwolame wrapper. The
\&\fBtwolame\fR\-equivalent options follow the FFmpeg ones and are in
parentheses.
.IP "\fBb (\fR\fI\-b\fR\fB)\fR" 4
.IX Item "b (-b)"
Set bitrate expressed in bits/s for \s-1CBR.\s0 \fBtwolame\fR \fBb\fR
option is expressed in kilobits/s. Default value is 128k.
.IP "\fBq (\fR\fI\-V\fR\fB)\fR" 4
.IX Item "q (-V)"
Set quality for experimental \s-1VBR\s0 support. Maximum value range is
from \-50 to 50, useful range is from \-10 to 10. The higher the
value, the better the quality. This option is valid only using the
\&\fBffmpeg\fR command-line tool. For library interface users,
use \fBglobal_quality\fR.
.IP "\fBmode (\fR\fI\-\-mode\fR\fB)\fR" 4
.IX Item "mode (--mode)"
Set the mode of the resulting audio. Possible values:
.RS 4
.IP "\fBauto\fR" 4
.IX Item "auto"
Choose mode automatically based on the input. This is the default.
.IP "\fBstereo\fR" 4
.IX Item "stereo"
Stereo
.IP "\fBjoint_stereo\fR" 4
.IX Item "joint_stereo"
Joint stereo
.IP "\fBdual_channel\fR" 4
.IX Item "dual_channel"
Dual channel
.IP "\fBmono\fR" 4
.IX Item "mono"
Mono
.RE
.RS 4
.RE
.IP "\fBpsymodel (\fR\fI\-\-psyc\-mode\fR\fB)\fR" 4
.IX Item "psymodel (--psyc-mode)"
Set psychoacoustic model to use in encoding. The argument must be
an integer between \-1 and 4, inclusive. The higher the value, the
better the quality. The default value is 3.
.IP "\fBenergy_levels (\fR\fI\-\-energy\fR\fB)\fR" 4
.IX Item "energy_levels (--energy)"
Enable energy levels extensions when set to 1. The default value is
0 (disabled).
.IP "\fBerror_protection (\fR\fI\-\-protect\fR\fB)\fR" 4
.IX Item "error_protection (--protect)"
Enable \s-1CRC\s0 error protection when set to 1. The default value is 0
(disabled).
.IP "\fBcopyright (\fR\fI\-\-copyright\fR\fB)\fR" 4
.IX Item "copyright (--copyright)"
Set \s-1MPEG\s0 audio copyright flag when set to 1. The default value is 0
(disabled).
.IP "\fBoriginal (\fR\fI\-\-original\fR\fB)\fR" 4
.IX Item "original (--original)"
Set \s-1MPEG\s0 audio original flag when set to 1. The default value is 0
(disabled).
.SS "libvo-amrwbenc"
.IX Subsection "libvo-amrwbenc"
VisualOn Adaptive Multi-Rate Wideband encoder.
.PP
Requires the presence of the libvo-amrwbenc headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libvo\-amrwbenc \-\-enable\-version3\*(C'\fR.
.PP
This is a mono-only encoder. Officially it only supports 16000Hz sample
rate, but you can override it by setting \fBstrict\fR to
\&\fBunofficial\fR or lower.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBb\fR" 4
.IX Item "b"
Set bitrate in bits/s. Only the following bitrates are supported, otherwise
libavcodec will round to the nearest valid bitrate.
.RS 4
.IP "\fB6600\fR" 4
.IX Item "6600"
.PD 0
.IP "\fB8850\fR" 4
.IX Item "8850"
.IP "\fB12650\fR" 4
.IX Item "12650"
.IP "\fB14250\fR" 4
.IX Item "14250"
.IP "\fB15850\fR" 4
.IX Item "15850"
.IP "\fB18250\fR" 4
.IX Item "18250"
.IP "\fB19850\fR" 4
.IX Item "19850"
.IP "\fB23050\fR" 4
.IX Item "23050"
.IP "\fB23850\fR" 4
.IX Item "23850"
.RE
.RS 4
.RE
.IP "\fBdtx\fR" 4
.IX Item "dtx"
.PD
Allow discontinuous transmission (generate comfort noise) when set to 1. The
default value is 0 (disabled).
.SS "libvorbis"
.IX Subsection "libvorbis"
libvorbis encoder wrapper.
.PP
Requires the presence of the libvorbisenc headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libvorbis\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are supported by the libvorbis wrapper. The
\&\fBoggenc\fR\-equivalent of the options are listed in parentheses.
.PP
To get a more accurate and extensive documentation of the libvorbis
options, consult the libvorbisenc's and \fBoggenc\fR's documentations.
See <\fBhttp://xiph.org/vorbis/\fR>,
<\fBhttp://wiki.xiph.org/Vorbis\-tools\fR>, and \fBoggenc\fR\|(1).
.IP "\fBb (\fR\fI\-b\fR\fB)\fR" 4
.IX Item "b (-b)"
Set bitrate expressed in bits/s for \s-1ABR.\s0 \fBoggenc\fR \fB\-b\fR is
expressed in kilobits/s.
.IP "\fBq (\fR\fI\-q\fR\fB)\fR" 4
.IX Item "q (-q)"
Set constant quality setting for \s-1VBR.\s0 The value should be a float
number in the range of \-1.0 to 10.0. The higher the value, the better
the quality. The default value is \fB3.0\fR.
.Sp
This option is valid only using the \fBffmpeg\fR command-line tool.
For library interface users, use \fBglobal_quality\fR.
.IP "\fBcutoff (\fR\fI\-\-advanced\-encode\-option lowpass_frequency=N\fR\fB)\fR" 4
.IX Item "cutoff (--advanced-encode-option lowpass_frequency=N)"
Set cutoff bandwidth in Hz, a value of 0 disables cutoff. \fBoggenc\fR's
related option is expressed in kHz. The default value is \fB0\fR (cutoff
disabled).
.IP "\fBminrate (\fR\fI\-m\fR\fB)\fR" 4
.IX Item "minrate (-m)"
Set minimum bitrate expressed in bits/s. \fBoggenc\fR \fB\-m\fR is
expressed in kilobits/s.
.IP "\fBmaxrate (\fR\fI\-M\fR\fB)\fR" 4
.IX Item "maxrate (-M)"
Set maximum bitrate expressed in bits/s. \fBoggenc\fR \fB\-M\fR is
expressed in kilobits/s. This only has effect on \s-1ABR\s0 mode.
.IP "\fBiblock (\fR\fI\-\-advanced\-encode\-option impulse_noisetune=N\fR\fB)\fR" 4
.IX Item "iblock (--advanced-encode-option impulse_noisetune=N)"
Set noise floor bias for impulse blocks. The value is a float number from
\&\-15.0 to 0.0. A negative bias instructs the encoder to pay special attention
to the crispness of transients in the encoded audio. The tradeoff for better
transient response is a higher bitrate.
.SS "mjpeg"
.IX Subsection "mjpeg"
Motion \s-1JPEG\s0 encoder.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBhuffman\fR" 4
.IX Item "huffman"
Set the huffman encoding strategy. Possible values:
.RS 4
.IP "\fBdefault\fR" 4
.IX Item "default"
Use the default huffman tables. This is the default strategy.
.IP "\fBoptimal\fR" 4
.IX Item "optimal"
Compute and use optimal huffman tables.
.RE
.RS 4
.RE
.SS "wavpack"
.IX Subsection "wavpack"
WavPack lossless audio encoder.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The equivalent options for \fBwavpack\fR command line utility are listed in
parentheses.
.PP
Shared options
.IX Subsection "Shared options"
.PP
The following shared options are effective for this encoder. Only special notes
about this particular encoder will be documented here. For the general meaning
of the options, see \fBthe Codec Options chapter\fR.
.IP "\fBframe_size (\fR\fI\-\-blocksize\fR\fB)\fR" 4
.IX Item "frame_size (--blocksize)"
For this encoder, the range for this option is between 128 and 131072. Default
is automatically decided based on sample rate and number of channel.
.Sp
For the complete formula of calculating default, see
\&\fIlibavcodec/wavpackenc.c\fR.
.IP "\fBcompression_level (\fR\fI\-f\fR\fB,\fR \fI\-h\fR\fB,\fR \fI\-hh\fR\fB, and\fR \fI\-x\fR\fB)\fR" 4
.IX Item "compression_level (-f, -h, -hh, and -x)"
.PP
Private options
.IX Subsection "Private options"
.IP "\fBjoint_stereo (\fR\fI\-j\fR\fB)\fR" 4
.IX Item "joint_stereo (-j)"
Set whether to enable joint stereo. Valid values are:
.RS 4
.IP "\fBon (\fR\fI1\fR\fB)\fR" 4
.IX Item "on (1)"
Force mid/side audio encoding.
.IP "\fBoff (\fR\fI0\fR\fB)\fR" 4
.IX Item "off (0)"
Force left/right audio encoding.
.IP "\fBauto\fR" 4
.IX Item "auto"
Let the encoder decide automatically.
.RE
.RS 4
.RE
.IP "\fBoptimize_mono\fR" 4
.IX Item "optimize_mono"
Set whether to enable optimization for mono. This option is only effective for
non-mono streams. Available values:
.RS 4
.IP "\fBon\fR" 4
.IX Item "on"
enabled
.IP "\fBoff\fR" 4
.IX Item "off"
disabled
.RE
.RS 4
.RE
.SH "VIDEO ENCODERS"
.IX Header "VIDEO ENCODERS"
A description of some of the currently available video encoders
follows.
.SS "\s-1GIF\s0"
.IX Subsection "GIF"
\&\s-1GIF\s0 image/animation encoder.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBgifflags\fR \fIinteger\fR" 4
.IX Item "gifflags integer"
Sets the flags used for \s-1GIF\s0 encoding.
.RS 4
.IP "\fBoffsetting\fR" 4
.IX Item "offsetting"
Enables picture offsetting.
.Sp
Default is enabled.
.IP "\fBtransdiff\fR" 4
.IX Item "transdiff"
Enables transparency detection between frames.
.Sp
Default is enabled.
.RE
.RS 4
.RE
.IP "\fBgifimage\fR \fIinteger\fR" 4
.IX Item "gifimage integer"
Enables encoding one full \s-1GIF\s0 image per frame, rather than an animated \s-1GIF.\s0
.Sp
Default value is \fB0\fR.
.IP "\fBglobal_palette\fR \fIinteger\fR" 4
.IX Item "global_palette integer"
Writes a palette to the global \s-1GIF\s0 header where feasible.
.Sp
If disabled, every frame will always have a palette written, even if there
is a global palette supplied.
.Sp
Default value is \fB1\fR.
.SS "Hap"
.IX Subsection "Hap"
Vidvox Hap video encoder.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBformat\fR \fIinteger\fR" 4
.IX Item "format integer"
Specifies the Hap format to encode.
.RS 4
.IP "\fBhap\fR" 4
.IX Item "hap"
.PD 0
.IP "\fBhap_alpha\fR" 4
.IX Item "hap_alpha"
.IP "\fBhap_q\fR" 4
.IX Item "hap_q"
.RE
.RS 4
.PD
.Sp
Default value is \fBhap\fR.
.RE
.IP "\fBchunks\fR \fIinteger\fR" 4
.IX Item "chunks integer"
Specifies the number of chunks to split frames into, between 1 and 64. This
permits multithreaded decoding of large frames, potentially at the cost of
data-rate. The encoder may modify this value to divide frames evenly.
.Sp
Default value is \fI1\fR.
.IP "\fBcompressor\fR \fIinteger\fR" 4
.IX Item "compressor integer"
Specifies the second-stage compressor to use. If set to \fBnone\fR,
\&\fBchunks\fR will be limited to 1, as chunked uncompressed frames offer no
benefit.
.RS 4
.IP "\fBnone\fR" 4
.IX Item "none"
.PD 0
.IP "\fBsnappy\fR" 4
.IX Item "snappy"
.RE
.RS 4
.PD
.Sp
Default value is \fBsnappy\fR.
.RE
.SS "jpeg2000"
.IX Subsection "jpeg2000"
The native jpeg 2000 encoder is lossy by default, the \f(CW\*(C`\-q:v\*(C'\fR
option can be used to set the encoding quality. Lossless encoding
can be selected with \f(CW\*(C`\-pred 1\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBformat\fR \fIinteger\fR" 4
.IX Item "format integer"
Can be set to either \f(CW\*(C`j2k\*(C'\fR or \f(CW\*(C`jp2\*(C'\fR (the default) that
makes it possible to store non-rgb pix_fmts.
.IP "\fBtile_width\fR \fIinteger\fR" 4
.IX Item "tile_width integer"
Sets tile width. Range is 1 to 1073741824. Default is 256.
.IP "\fBtile_height\fR \fIinteger\fR" 4
.IX Item "tile_height integer"
Sets tile height. Range is 1 to 1073741824. Default is 256.
.IP "\fBpred\fR \fIinteger\fR" 4
.IX Item "pred integer"
Allows setting the discrete wavelet transform (\s-1DWT\s0) type
.RS 4
.IP "\fBdwt97int (Lossy)\fR" 4
.IX Item "dwt97int (Lossy)"
.PD 0
.IP "\fBdwt53 (Lossless)\fR" 4
.IX Item "dwt53 (Lossless)"
.RE
.RS 4
.PD
.Sp
Default is \f(CW\*(C`dwt97int\*(C'\fR
.RE
.IP "\fBsop\fR \fIboolean\fR" 4
.IX Item "sop boolean"
Enable this to add \s-1SOP\s0 marker at the start of each packet. Disabled by default.
.IP "\fBeph\fR \fIboolean\fR" 4
.IX Item "eph boolean"
Enable this to add \s-1EPH\s0 marker at the end of each packet header. Disabled by default.
.IP "\fBprog\fR \fIinteger\fR" 4
.IX Item "prog integer"
Sets the progression order to be used by the encoder.
Possible values are:
.RS 4
.IP "\fBlrcp\fR" 4
.IX Item "lrcp"
.PD 0
.IP "\fBrlcp\fR" 4
.IX Item "rlcp"
.IP "\fBrpcl\fR" 4
.IX Item "rpcl"
.IP "\fBpcrl\fR" 4
.IX Item "pcrl"
.IP "\fBcprl\fR" 4
.IX Item "cprl"
.RE
.RS 4
.PD
.Sp
Set to \f(CW\*(C`lrcp\*(C'\fR by default.
.RE
.IP "\fBlayer_rates\fR \fIstring\fR" 4
.IX Item "layer_rates string"
By default, when this option is not used, compression is done using the quality metric.
This option allows for compression using compression ratio. The compression ratio for each
level could be specified. The compression ratio of a layer \f(CW\*(C`l\*(C'\fR species the what ratio of
total file size is contained in the first \f(CW\*(C`l\*(C'\fR layers.
.Sp
Example usage:
.Sp
.Vb 1
\&        ffmpeg \-i input.bmp \-c:v jpeg2000 \-layer_rates "100,10,1" output.j2k
.Ve
.Sp
This would compress the image to contain 3 layers, where the data contained in the
first layer would be compressed by 1000 times, compressed by 100 in the first two layers,
and shall contain all data while using all 3 layers.
.SS "librav1e"
.IX Subsection "librav1e"
rav1e \s-1AV1\s0 encoder wrapper.
.PP
Requires the presence of the rav1e headers and library during configuration.
You need to explicitly configure the build with \f(CW\*(C`\-\-enable\-librav1e\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBqmax\fR" 4
.IX Item "qmax"
Sets the maximum quantizer to use when using bitrate mode.
.IP "\fBqmin\fR" 4
.IX Item "qmin"
Sets the minimum quantizer to use when using bitrate mode.
.IP "\fBqp\fR" 4
.IX Item "qp"
Uses quantizer mode to encode at the given quantizer (0\-255).
.IP "\fBspeed\fR" 4
.IX Item "speed"
Selects the speed preset (0\-10) to encode with.
.IP "\fBtiles\fR" 4
.IX Item "tiles"
Selects how many tiles to encode with.
.IP "\fBtile-rows\fR" 4
.IX Item "tile-rows"
Selects how many rows of tiles to encode with.
.IP "\fBtile-columns\fR" 4
.IX Item "tile-columns"
Selects how many columns of tiles to encode with.
.IP "\fBrav1e\-params\fR" 4
.IX Item "rav1e-params"
Set rav1e options using a list of \fIkey\fR=\fIvalue\fR pairs separated
by \*(L":\*(R". See \fBrav1e \-\-help\fR for a list of options.
.Sp
For example to specify librav1e encoding options with \fB\-rav1e\-params\fR:
.Sp
.Vb 1
\&        ffmpeg \-i input \-c:v librav1e \-b:v 500K \-rav1e\-params speed=5:low_latency=true output.mp4
.Ve
.SS "libaom\-av1"
.IX Subsection "libaom-av1"
libaom \s-1AV1\s0 encoder wrapper.
.PP
Requires the presence of the libaom headers and library during
configuration.  You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libaom\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The wrapper supports the following standard libavcodec options:
.IP "\fBb\fR" 4
.IX Item "b"
Set bitrate target in bits/second.  By default this will use
variable-bitrate mode.  If \fBmaxrate\fR and \fBminrate\fR are
also set to the same value then it will use constant-bitrate mode,
otherwise if \fBcrf\fR is set as well then it will use
constrained-quality mode.
.IP "\fBg keyint_min\fR" 4
.IX Item "g keyint_min"
Set key frame placement.  The \s-1GOP\s0 size sets the maximum distance between
key frames; if zero the output stream will be intra-only.  The minimum
distance is ignored unless it is the same as the \s-1GOP\s0 size, in which case
key frames will always appear at a fixed interval.  Not set by default,
so without this option the library has completely free choice about
where to place key frames.
.IP "\fBqmin qmax\fR" 4
.IX Item "qmin qmax"
Set minimum/maximum quantisation values.  Valid range is from 0 to 63
(warning: this does not match the quantiser values actually used by \s-1AV1\s0
\&\- divide by four to map real quantiser values to this range).  Defaults
to min/max (no constraint).
.IP "\fBminrate maxrate bufsize rc_init_occupancy\fR" 4
.IX Item "minrate maxrate bufsize rc_init_occupancy"
Set rate control buffering parameters.  Not used if not set \- defaults
to unconstrained variable bitrate.
.IP "\fBthreads\fR" 4
.IX Item "threads"
Set the number of threads to use while encoding.  This may require the
\&\fBtiles\fR or \fBrow-mt\fR options to also be set to actually
use the specified number of threads fully. Defaults to the number of
hardware threads supported by the host machine.
.IP "\fBprofile\fR" 4
.IX Item "profile"
Set the encoding profile.  Defaults to using the profile which matches
the bit depth and chroma subsampling of the input.
.PP
The wrapper also has some specific options:
.IP "\fBcpu-used\fR" 4
.IX Item "cpu-used"
Set the quality/encoding speed tradeoff.  Valid range is from 0 to 8,
higher numbers indicating greater speed and lower quality.  The default
value is 1, which will be slow and high quality.
.IP "\fBauto-alt-ref\fR" 4
.IX Item "auto-alt-ref"
Enable use of alternate reference frames.  Defaults to the internal
default of the library.
.IP "\fBarnr-max-frames (\fR\fIframes\fR\fB)\fR" 4
.IX Item "arnr-max-frames (frames)"
Set altref noise reduction max frame count. Default is \-1.
.IP "\fBarnr-strength (\fR\fIstrength\fR\fB)\fR" 4
.IX Item "arnr-strength (strength)"
Set altref noise reduction filter strength. Range is \-1 to 6. Default is \-1.
.IP "\fBaq-mode (\fR\fIaq-mode\fR\fB)\fR" 4
.IX Item "aq-mode (aq-mode)"
Set adaptive quantization mode. Possible values:
.RS 4
.IP "\fBnone (\fR\fI0\fR\fB)\fR" 4
.IX Item "none (0)"
Disabled.
.IP "\fBvariance (\fR\fI1\fR\fB)\fR" 4
.IX Item "variance (1)"
Variance-based.
.IP "\fBcomplexity (\fR\fI2\fR\fB)\fR" 4
.IX Item "complexity (2)"
Complexity-based.
.IP "\fBcyclic (\fR\fI3\fR\fB)\fR" 4
.IX Item "cyclic (3)"
Cyclic refresh.
.RE
.RS 4
.RE
.IP "\fBtune (\fR\fItune\fR\fB)\fR" 4
.IX Item "tune (tune)"
Set the distortion metric the encoder is tuned with. Default is \f(CW\*(C`psnr\*(C'\fR.
.RS 4
.IP "\fBpsnr (\fR\fI0\fR\fB)\fR" 4
.IX Item "psnr (0)"
.PD 0
.IP "\fBssim (\fR\fI1\fR\fB)\fR" 4
.IX Item "ssim (1)"
.RE
.RS 4
.RE
.IP "\fBlag-in-frames\fR" 4
.IX Item "lag-in-frames"
.PD
Set the maximum number of frames which the encoder may keep in flight
at any one time for lookahead purposes.  Defaults to the internal
default of the library.
.IP "\fBerror-resilience\fR" 4
.IX Item "error-resilience"
Enable error resilience features:
.RS 4
.IP "\fBdefault\fR" 4
.IX Item "default"
Improve resilience against losses of whole frames.
.RE
.RS 4
.Sp
Not enabled by default.
.RE
.IP "\fBcrf\fR" 4
.IX Item "crf"
Set the quality/size tradeoff for constant-quality (no bitrate target)
and constrained-quality (with maximum bitrate target) modes. Valid
range is 0 to 63, higher numbers indicating lower quality and smaller
output size.  Only used if set; by default only the bitrate target is
used.
.IP "\fBstatic-thresh\fR" 4
.IX Item "static-thresh"
Set a change threshold on blocks below which they will be skipped by
the encoder.  Defined in arbitrary units as a nonnegative integer,
defaulting to zero (no blocks are skipped).
.IP "\fBdrop-threshold\fR" 4
.IX Item "drop-threshold"
Set a threshold for dropping frames when close to rate control bounds.
Defined as a percentage of the target buffer \- when the rate control
buffer falls below this percentage, frames will be dropped until it
has refilled above the threshold.  Defaults to zero (no frames are
dropped).
.IP "\fBdenoise-noise-level (\fR\fIlevel\fR\fB)\fR" 4
.IX Item "denoise-noise-level (level)"
Amount of noise to be removed for grain synthesis. Grain synthesis is disabled if
this option is not set or set to 0.
.IP "\fBdenoise-block-size (\fR\fIpixels\fR\fB)\fR" 4
.IX Item "denoise-block-size (pixels)"
Block size used for denoising for grain synthesis. If not set, \s-1AV1\s0 codec
uses the default value of 32.
.IP "\fBundershoot-pct (\fR\fIpct\fR\fB)\fR" 4
.IX Item "undershoot-pct (pct)"
Set datarate undershoot (min) percentage of the target bitrate. Range is \-1 to 100.
Default is \-1.
.IP "\fBovershoot-pct (\fR\fIpct\fR\fB)\fR" 4
.IX Item "overshoot-pct (pct)"
Set datarate overshoot (max) percentage of the target bitrate. Range is \-1 to 1000.
Default is \-1.
.IP "\fBminsection-pct (\fR\fIpct\fR\fB)\fR" 4
.IX Item "minsection-pct (pct)"
Minimum percentage variation of the \s-1GOP\s0 bitrate from the target bitrate. If minsection-pct
is not set, the libaomenc wrapper computes it as follows: \f(CW\*(C`(minrate * 100 / bitrate)\*(C'\fR.
Range is \-1 to 100. Default is \-1 (unset).
.IP "\fBmaxsection-pct (\fR\fIpct\fR\fB)\fR" 4
.IX Item "maxsection-pct (pct)"
Maximum percentage variation of the \s-1GOP\s0 bitrate from the target bitrate. If maxsection-pct
is not set, the libaomenc wrapper computes it as follows: \f(CW\*(C`(maxrate * 100 / bitrate)\*(C'\fR.
Range is \-1 to 5000. Default is \-1 (unset).
.IP "\fBframe-parallel (\fR\fIboolean\fR\fB)\fR" 4
.IX Item "frame-parallel (boolean)"
Enable frame parallel decodability features. Default is true.
.IP "\fBtiles\fR" 4
.IX Item "tiles"
Set the number of tiles to encode the input video with, as columns x
rows.  Larger numbers allow greater parallelism in both encoding and
decoding, but may decrease coding efficiency.  Defaults to the minimum
number of tiles required by the size of the input video (this is 1x1
(that is, a single tile) for sizes up to and including 4K).
.IP "\fBtile-columns tile-rows\fR" 4
.IX Item "tile-columns tile-rows"
Set the number of tiles as log2 of the number of tile rows and columns.
Provided for compatibility with libvpx/VP9.
.IP "\fBrow-mt (Requires libaom >= 1.0.0\-759\-g90a15f4f2)\fR" 4
.IX Item "row-mt (Requires libaom >= 1.0.0-759-g90a15f4f2)"
Enable row based multi-threading. Disabled by default.
.IP "\fBenable-cdef (\fR\fIboolean\fR\fB)\fR" 4
.IX Item "enable-cdef (boolean)"
Enable Constrained Directional Enhancement Filter. The libaom\-av1
encoder enables \s-1CDEF\s0 by default.
.IP "\fBenable-restoration (\fR\fIboolean\fR\fB)\fR" 4
.IX Item "enable-restoration (boolean)"
Enable Loop Restoration Filter. Default is true for libaom\-av1.
.IP "\fBenable-global-motion (\fR\fIboolean\fR\fB)\fR" 4
.IX Item "enable-global-motion (boolean)"
Enable the use of global motion for block prediction. Default is true.
.IP "\fBenable-intrabc (\fR\fIboolean\fR\fB)\fR" 4
.IX Item "enable-intrabc (boolean)"
Enable block copy mode for intra block prediction. This mode is
useful for screen content. Default is true.
.IP "\fBenable-rect-partitions (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-rect-partitions (boolean) (Requires libaom >= v2.0.0)"
Enable rectangular partitions. Default is true.
.IP "\fBenable\-1to4\-partitions (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-1to4-partitions (boolean) (Requires libaom >= v2.0.0)"
Enable 1:4/4:1 partitions. Default is true.
.IP "\fBenable-ab-partitions (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-ab-partitions (boolean) (Requires libaom >= v2.0.0)"
Enable \s-1AB\s0 shape partitions. Default is true.
.IP "\fBenable-angle-delta (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-angle-delta (boolean) (Requires libaom >= v2.0.0)"
Enable angle delta intra prediction. Default is true.
.IP "\fBenable-cfl-intra (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-cfl-intra (boolean) (Requires libaom >= v2.0.0)"
Enable chroma predicted from luma intra prediction. Default is true.
.IP "\fBenable-filter-intra (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-filter-intra (boolean) (Requires libaom >= v2.0.0)"
Enable filter intra predictor. Default is true.
.IP "\fBenable-intra-edge-filter (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-intra-edge-filter (boolean) (Requires libaom >= v2.0.0)"
Enable intra edge filter. Default is true.
.IP "\fBenable-smooth-intra (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-smooth-intra (boolean) (Requires libaom >= v2.0.0)"
Enable smooth intra prediction mode. Default is true.
.IP "\fBenable-paeth-intra (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-paeth-intra (boolean) (Requires libaom >= v2.0.0)"
Enable paeth predictor in intra prediction. Default is true.
.IP "\fBenable-palette (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-palette (boolean) (Requires libaom >= v2.0.0)"
Enable palette prediction mode. Default is true.
.IP "\fBenable-flip-idtx (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-flip-idtx (boolean) (Requires libaom >= v2.0.0)"
Enable extended transform type, including \s-1FLIPADST_DCT, DCT_FLIPADST,
FLIPADST_FLIPADST, ADST_FLIPADST, FLIPADST_ADST, IDTX, V_DCT, H_DCT,
V_ADST, H_ADST, V_FLIPADST, H_FLIPADST.\s0 Default is true.
.IP "\fBenable\-tx64 (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-tx64 (boolean) (Requires libaom >= v2.0.0)"
Enable 64\-pt transform. Default is true.
.IP "\fBreduced-tx-type-set (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "reduced-tx-type-set (boolean) (Requires libaom >= v2.0.0)"
Use reduced set of transform types. Default is false.
.IP "\fBuse-intra-dct-only (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "use-intra-dct-only (boolean) (Requires libaom >= v2.0.0)"
Use \s-1DCT\s0 only for \s-1INTRA\s0 modes. Default is false.
.IP "\fBuse-inter-dct-only (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "use-inter-dct-only (boolean) (Requires libaom >= v2.0.0)"
Use \s-1DCT\s0 only for \s-1INTER\s0 modes. Default is false.
.IP "\fBuse-intra-default-tx-only (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "use-intra-default-tx-only (boolean) (Requires libaom >= v2.0.0)"
Use Default-transform only for \s-1INTRA\s0 modes. Default is false.
.IP "\fBenable-ref-frame-mvs (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-ref-frame-mvs (boolean) (Requires libaom >= v2.0.0)"
Enable temporal mv prediction. Default is true.
.IP "\fBenable-reduced-reference-set (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-reduced-reference-set (boolean) (Requires libaom >= v2.0.0)"
Use reduced set of single and compound references. Default is false.
.IP "\fBenable-obmc (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-obmc (boolean) (Requires libaom >= v2.0.0)"
Enable obmc. Default is true.
.IP "\fBenable-dual-filter (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-dual-filter (boolean) (Requires libaom >= v2.0.0)"
Enable dual filter. Default is true.
.IP "\fBenable-diff-wtd-comp (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-diff-wtd-comp (boolean) (Requires libaom >= v2.0.0)"
Enable difference-weighted compound. Default is true.
.IP "\fBenable-dist-wtd-comp (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-dist-wtd-comp (boolean) (Requires libaom >= v2.0.0)"
Enable distance-weighted compound. Default is true.
.IP "\fBenable-onesided-comp (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-onesided-comp (boolean) (Requires libaom >= v2.0.0)"
Enable one sided compound. Default is true.
.IP "\fBenable-interinter-wedge (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-interinter-wedge (boolean) (Requires libaom >= v2.0.0)"
Enable interinter wedge compound. Default is true.
.IP "\fBenable-interintra-wedge (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-interintra-wedge (boolean) (Requires libaom >= v2.0.0)"
Enable interintra wedge compound. Default is true.
.IP "\fBenable-masked-comp (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-masked-comp (boolean) (Requires libaom >= v2.0.0)"
Enable masked compound. Default is true.
.IP "\fBenable-interintra-comp (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-interintra-comp (boolean) (Requires libaom >= v2.0.0)"
Enable interintra compound. Default is true.
.IP "\fBenable-smooth-interintra (\fR\fIboolean\fR\fB) (Requires libaom >= v2.0.0)\fR" 4
.IX Item "enable-smooth-interintra (boolean) (Requires libaom >= v2.0.0)"
Enable smooth interintra mode. Default is true.
.IP "\fBaom-params\fR" 4
.IX Item "aom-params"
Set libaom options using a list of \fIkey\fR=\fIvalue\fR pairs separated
by \*(L":\*(R". For a list of supported options, see \fBaomenc \-\-help\fR under the
section \*(L"\s-1AV1\s0 Specific Options\*(R".
.Sp
For example to specify libaom encoding options with \fB\-aom\-params\fR:
.Sp
.Vb 1
\&        ffmpeg \-i input \-c:v libaom\-av1 \-b:v 500K \-aom\-params tune=psnr:enable\-tpl\-model=1 output.mp4
.Ve
.SS "libsvtav1"
.IX Subsection "libsvtav1"
\&\s-1SVT\-AV1\s0 encoder wrapper.
.PP
Requires the presence of the \s-1SVT\-AV1\s0 headers and library during configuration.
You need to explicitly configure the build with \f(CW\*(C`\-\-enable\-libsvtav1\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBprofile\fR" 4
.IX Item "profile"
Set the encoding profile.
.IP "\fBlevel\fR" 4
.IX Item "level"
Set the operating point level.
.IP "\fBtier\fR" 4
.IX Item "tier"
Set the operating point tier.
.IP "\fBrc\fR" 4
.IX Item "rc"
Set the rate control mode to use.
.Sp
Possible modes:
.RS 4
.IP "\fBcqp\fR" 4
.IX Item "cqp"
Constant quantizer: use fixed values of qindex (dependent on the frame type)
throughout the stream.  This mode is the default.
.IP "\fBvbr\fR" 4
.IX Item "vbr"
Variable bitrate: use a target bitrate for the whole stream.
.IP "\fBcvbr\fR" 4
.IX Item "cvbr"
Constrained variable bitrate: use a target bitrate for each \s-1GOP.\s0
.RE
.RS 4
.RE
.IP "\fBqmax\fR" 4
.IX Item "qmax"
Set the maximum quantizer to use when using a bitrate mode.
.IP "\fBqmin\fR" 4
.IX Item "qmin"
Set the minimum quantizer to use when using a bitrate mode.
.IP "\fBqp\fR" 4
.IX Item "qp"
Set the quantizer used in cqp rate control mode (0\-63).
.IP "\fBsc_detection\fR" 4
.IX Item "sc_detection"
Enable scene change detection.
.IP "\fBla_depth\fR" 4
.IX Item "la_depth"
Set number of frames to look ahead (0\-120).
.IP "\fBpreset\fR" 4
.IX Item "preset"
Set the quality-speed tradeoff, in the range 0 to 8.  Higher values are
faster but lower quality.  Defaults to 8 (highest speed).
.IP "\fBtile_rows\fR" 4
.IX Item "tile_rows"
Set log2 of the number of rows of tiles to use (0\-6).
.IP "\fBtile_columns\fR" 4
.IX Item "tile_columns"
Set log2 of the number of columns of tiles to use (0\-4).
.SS "libkvazaar"
.IX Subsection "libkvazaar"
Kvazaar H.265/HEVC encoder.
.PP
Requires the presence of the libkvazaar headers and library during
configuration. You need to explicitly configure the build with
\&\fB\-\-enable\-libkvazaar\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBb\fR" 4
.IX Item "b"
Set target video bitrate in bit/s and enable rate control.
.IP "\fBkvazaar-params\fR" 4
.IX Item "kvazaar-params"
Set kvazaar parameters as a list of \fIname\fR=\fIvalue\fR pairs separated
by commas (,). See kvazaar documentation for a list of options.
.SS "libopenh264"
.IX Subsection "libopenh264"
Cisco libopenh264 H.264/MPEG\-4 \s-1AVC\s0 encoder wrapper.
.PP
This encoder requires the presence of the libopenh264 headers and
library during configuration. You need to explicitly configure the
build with \f(CW\*(C`\-\-enable\-libopenh264\*(C'\fR. The library is detected using
\&\fBpkg-config\fR.
.PP
For more information about the library see
<\fBhttp://www.openh264.org\fR>.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following FFmpeg global options affect the configurations of the
libopenh264 encoder.
.IP "\fBb\fR" 4
.IX Item "b"
Set the bitrate (as a number of bits per second).
.IP "\fBg\fR" 4
.IX Item "g"
Set the \s-1GOP\s0 size.
.IP "\fBmaxrate\fR" 4
.IX Item "maxrate"
Set the max bitrate (as a number of bits per second).
.IP "\fBflags +global_header\fR" 4
.IX Item "flags +global_header"
Set global header in the bitstream.
.IP "\fBslices\fR" 4
.IX Item "slices"
Set the number of slices, used in parallelized encoding. Default value
is 0. This is only used when \fBslice_mode\fR is set to
\&\fBfixed\fR.
.IP "\fBslice_mode\fR" 4
.IX Item "slice_mode"
Set slice mode. Can assume one of the following possible values:
.RS 4
.IP "\fBfixed\fR" 4
.IX Item "fixed"
a fixed number of slices
.IP "\fBrowmb\fR" 4
.IX Item "rowmb"
one slice per row of macroblocks
.IP "\fBauto\fR" 4
.IX Item "auto"
automatic number of slices according to number of threads
.IP "\fBdyn\fR" 4
.IX Item "dyn"
dynamic slicing
.RE
.RS 4
.Sp
Default value is \fBauto\fR.
.RE
.IP "\fBloopfilter\fR" 4
.IX Item "loopfilter"
Enable loop filter, if set to 1 (automatically enabled). To disable
set a value of 0.
.IP "\fBprofile\fR" 4
.IX Item "profile"
Set profile restrictions. If set to the value of \fBmain\fR enable
\&\s-1CABAC\s0 (set the \f(CW\*(C`SEncParamExt.iEntropyCodingModeFlag\*(C'\fR flag to 1).
.IP "\fBmax_nal_size\fR" 4
.IX Item "max_nal_size"
Set maximum \s-1NAL\s0 size in bytes.
.IP "\fBallow_skip_frames\fR" 4
.IX Item "allow_skip_frames"
Allow skipping frames to hit the target bitrate if set to 1.
.SS "libtheora"
.IX Subsection "libtheora"
libtheora Theora encoder wrapper.
.PP
Requires the presence of the libtheora headers and library during
configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libtheora\*(C'\fR.
.PP
For more information about the libtheora project see
<\fBhttp://www.theora.org/\fR>.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following global options are mapped to internal libtheora options
which affect the quality and the bitrate of the encoded stream.
.IP "\fBb\fR" 4
.IX Item "b"
Set the video bitrate in bit/s for \s-1CBR\s0 (Constant Bit Rate) mode.  In
case \s-1VBR\s0 (Variable Bit Rate) mode is enabled this option is ignored.
.IP "\fBflags\fR" 4
.IX Item "flags"
Used to enable constant quality mode (\s-1VBR\s0) encoding through the
\&\fBqscale\fR flag, and to enable the \f(CW\*(C`pass1\*(C'\fR and \f(CW\*(C`pass2\*(C'\fR
modes.
.IP "\fBg\fR" 4
.IX Item "g"
Set the \s-1GOP\s0 size.
.IP "\fBglobal_quality\fR" 4
.IX Item "global_quality"
Set the global quality as an integer in lambda units.
.Sp
Only relevant when \s-1VBR\s0 mode is enabled with \f(CW\*(C`flags +qscale\*(C'\fR. The
value is converted to \s-1QP\s0 units by dividing it by \f(CW\*(C`FF_QP2LAMBDA\*(C'\fR,
clipped in the [0 \- 10] range, and then multiplied by 6.3 to get a
value in the native libtheora range [0\-63]. A higher value corresponds
to a higher quality.
.IP "\fBq\fR" 4
.IX Item "q"
Enable \s-1VBR\s0 mode when set to a non-negative value, and set constant
quality value as a double floating point value in \s-1QP\s0 units.
.Sp
The value is clipped in the [0\-10] range, and then multiplied by 6.3
to get a value in the native libtheora range [0\-63].
.Sp
This option is valid only using the \fBffmpeg\fR command-line
tool. For library interface users, use \fBglobal_quality\fR.
.PP
\fIExamples\fR
.IX Subsection "Examples"
.IP "\(bu" 4
Set maximum constant quality (\s-1VBR\s0) encoding with \fBffmpeg\fR:
.Sp
.Vb 1
\&        ffmpeg \-i INPUT \-codec:v libtheora \-q:v 10 OUTPUT.ogg
.Ve
.IP "\(bu" 4
Use \fBffmpeg\fR to convert a \s-1CBR 1000\s0 kbps Theora video stream:
.Sp
.Vb 1
\&        ffmpeg \-i INPUT \-codec:v libtheora \-b:v 1000k OUTPUT.ogg
.Ve
.SS "libvpx"
.IX Subsection "libvpx"
\&\s-1VP8/VP9\s0 format supported through libvpx.
.PP
Requires the presence of the libvpx headers and library during configuration.
You need to explicitly configure the build with \f(CW\*(C`\-\-enable\-libvpx\*(C'\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are supported by the libvpx wrapper. The
\&\fBvpxenc\fR\-equivalent options or values are listed in parentheses
for easy migration.
.PP
To reduce the duplication of documentation, only the private options
and some others requiring special attention are documented here. For
the documentation of the undocumented generic options, see
\&\fBthe Codec Options chapter\fR.
.PP
To get more documentation of the libvpx options, invoke the command
\&\fBffmpeg \-h encoder=libvpx\fR, \fBffmpeg \-h encoder=libvpx\-vp9\fR or
\&\fBvpxenc \-\-help\fR. Further information is available in the libvpx \s-1API\s0
documentation.
.IP "\fBb (\fR\fItarget-bitrate\fR\fB)\fR" 4
.IX Item "b (target-bitrate)"
Set bitrate in bits/s. Note that FFmpeg's \fBb\fR option is
expressed in bits/s, while \fBvpxenc\fR's \fBtarget-bitrate\fR is in
kilobits/s.
.IP "\fBg (\fR\fIkf-max-dist\fR\fB)\fR" 4
.IX Item "g (kf-max-dist)"
.PD 0
.IP "\fBkeyint_min (\fR\fIkf-min-dist\fR\fB)\fR" 4
.IX Item "keyint_min (kf-min-dist)"
.IP "\fBqmin (\fR\fImin-q\fR\fB)\fR" 4
.IX Item "qmin (min-q)"
.IP "\fBqmax (\fR\fImax-q\fR\fB)\fR" 4
.IX Item "qmax (max-q)"
.IP "\fBbufsize (\fR\fIbuf-sz\fR\fB,\fR \fIbuf-optimal-sz\fR\fB)\fR" 4
.IX Item "bufsize (buf-sz, buf-optimal-sz)"
.PD
Set ratecontrol buffer size (in bits). Note \fBvpxenc\fR's options are
specified in milliseconds, the libvpx wrapper converts this value as follows:
\&\f(CW\*(C`buf\-sz = bufsize * 1000 / bitrate\*(C'\fR,
\&\f(CW\*(C`buf\-optimal\-sz = bufsize * 1000 / bitrate * 5 / 6\*(C'\fR.
.IP "\fBrc_init_occupancy (\fR\fIbuf-initial-sz\fR\fB)\fR" 4
.IX Item "rc_init_occupancy (buf-initial-sz)"
Set number of bits which should be loaded into the rc buffer before decoding
starts. Note \fBvpxenc\fR's option is specified in milliseconds, the libvpx
wrapper converts this value as follows:
\&\f(CW\*(C`rc_init_occupancy * 1000 / bitrate\*(C'\fR.
.IP "\fBundershoot-pct\fR" 4
.IX Item "undershoot-pct"
Set datarate undershoot (min) percentage of the target bitrate.
.IP "\fBovershoot-pct\fR" 4
.IX Item "overshoot-pct"
Set datarate overshoot (max) percentage of the target bitrate.
.IP "\fBskip_threshold (\fR\fIdrop-frame\fR\fB)\fR" 4
.IX Item "skip_threshold (drop-frame)"
.PD 0
.IP "\fBqcomp (\fR\fIbias-pct\fR\fB)\fR" 4
.IX Item "qcomp (bias-pct)"
.IP "\fBmaxrate (\fR\fImaxsection-pct\fR\fB)\fR" 4
.IX Item "maxrate (maxsection-pct)"
.PD
Set \s-1GOP\s0 max bitrate in bits/s. Note \fBvpxenc\fR's option is specified as a
percentage of the target bitrate, the libvpx wrapper converts this value as
follows: \f(CW\*(C`(maxrate * 100 / bitrate)\*(C'\fR.
.IP "\fBminrate (\fR\fIminsection-pct\fR\fB)\fR" 4
.IX Item "minrate (minsection-pct)"
Set \s-1GOP\s0 min bitrate in bits/s. Note \fBvpxenc\fR's option is specified as a
percentage of the target bitrate, the libvpx wrapper converts this value as
follows: \f(CW\*(C`(minrate * 100 / bitrate)\*(C'\fR.
.IP "\fBminrate, maxrate, b\fR \fIend\-usage=cbr\fR" 4
.IX Item "minrate, maxrate, b end-usage=cbr"
\&\f(CW\*(C`(minrate == maxrate == bitrate)\*(C'\fR.
.IP "\fBcrf (\fR\fIend\-usage=cq\fR\fB,\fR \fIcq-level\fR\fB)\fR" 4
.IX Item "crf (end-usage=cq, cq-level)"
.PD 0
.IP "\fBtune (\fR\fItune\fR\fB)\fR" 4
.IX Item "tune (tune)"
.RS 4
.IP "\fBpsnr (\fR\fIpsnr\fR\fB)\fR" 4
.IX Item "psnr (psnr)"
.IP "\fBssim (\fR\fIssim\fR\fB)\fR" 4
.IX Item "ssim (ssim)"
.RE
.RS 4
.RE
.IP "\fBquality, deadline (\fR\fIdeadline\fR\fB)\fR" 4
.IX Item "quality, deadline (deadline)"
.RS 4
.IP "\fBbest\fR" 4
.IX Item "best"
.PD
Use best quality deadline. Poorly named and quite slow, this option should be
avoided as it may give worse quality output than good.
.IP "\fBgood\fR" 4
.IX Item "good"
Use good quality deadline. This is a good trade-off between speed and quality
when used with the \fBcpu-used\fR option.
.IP "\fBrealtime\fR" 4
.IX Item "realtime"
Use realtime quality deadline.
.RE
.RS 4
.RE
.IP "\fBspeed, cpu-used (\fR\fIcpu-used\fR\fB)\fR" 4
.IX Item "speed, cpu-used (cpu-used)"
Set quality/speed ratio modifier. Higher values speed up the encode at the cost
of quality.
.IP "\fBnr (\fR\fInoise-sensitivity\fR\fB)\fR" 4
.IX Item "nr (noise-sensitivity)"
.PD 0
.IP "\fBstatic-thresh\fR" 4
.IX Item "static-thresh"
.PD
Set a change threshold on blocks below which they will be skipped by the
encoder.
.IP "\fBslices (\fR\fItoken-parts\fR\fB)\fR" 4
.IX Item "slices (token-parts)"
Note that FFmpeg's \fBslices\fR option gives the total number of partitions,
while \fBvpxenc\fR's \fBtoken-parts\fR is given as
\&\f(CW\*(C`log2(partitions)\*(C'\fR.
.IP "\fBmax-intra-rate\fR" 4
.IX Item "max-intra-rate"
Set maximum I\-frame bitrate as a percentage of the target bitrate. A value of 0
means unlimited.
.IP "\fBforce_key_frames\fR" 4
.IX Item "force_key_frames"
\&\f(CW\*(C`VPX_EFLAG_FORCE_KF\*(C'\fR
.IP "\fBAlternate reference frame related\fR" 4
.IX Item "Alternate reference frame related"
.RS 4
.PD 0
.IP "\fBauto-alt-ref\fR" 4
.IX Item "auto-alt-ref"
.PD
Enable use of alternate reference frames (2\-pass only).
Values greater than 1 enable multi-layer alternate reference frames (\s-1VP9\s0 only).
.IP "\fBarnr-maxframes\fR" 4
.IX Item "arnr-maxframes"
Set altref noise reduction max frame count.
.IP "\fBarnr-type\fR" 4
.IX Item "arnr-type"
Set altref noise reduction filter type: backward, forward, centered.
.IP "\fBarnr-strength\fR" 4
.IX Item "arnr-strength"
Set altref noise reduction filter strength.
.IP "\fBrc-lookahead, lag-in-frames (\fR\fIlag-in-frames\fR\fB)\fR" 4
.IX Item "rc-lookahead, lag-in-frames (lag-in-frames)"
Set number of frames to look ahead for frametype and ratecontrol.
.RE
.RS 4
.RE
.IP "\fBerror-resilient\fR" 4
.IX Item "error-resilient"
Enable error resiliency features.
.IP "\fBsharpness\fR \fIinteger\fR" 4
.IX Item "sharpness integer"
Increase sharpness at the expense of lower \s-1PSNR.\s0
The valid range is [0, 7].
.IP "\fBts-parameters\fR" 4
.IX Item "ts-parameters"
Sets the temporal scalability configuration using a :\-separated list of
key=value pairs. For example, to specify temporal scalability parameters
with \f(CW\*(C`ffmpeg\*(C'\fR:
.Sp
.Vb 3
\&        ffmpeg \-i INPUT \-c:v libvpx \-ts\-parameters ts_number_layers=3:\e
\&        ts_target_bitrate=250,500,1000:ts_rate_decimator=4,2,1:\e
\&        ts_periodicity=4:ts_layer_id=0,2,1,2:ts_layering_mode=3 OUTPUT
.Ve
.Sp
Below is a brief explanation of each of the parameters, please
refer to \f(CW\*(C`struct vpx_codec_enc_cfg\*(C'\fR in \f(CW\*(C`vpx/vpx_encoder.h\*(C'\fR for more
details.
.RS 4
.IP "\fBts_number_layers\fR" 4
.IX Item "ts_number_layers"
Number of temporal coding layers.
.IP "\fBts_target_bitrate\fR" 4
.IX Item "ts_target_bitrate"
Target bitrate for each temporal layer (in kbps).
(bitrate should be inclusive of the lower temporal layer).
.IP "\fBts_rate_decimator\fR" 4
.IX Item "ts_rate_decimator"
Frame rate decimation factor for each temporal layer.
.IP "\fBts_periodicity\fR" 4
.IX Item "ts_periodicity"
Length of the sequence defining frame temporal layer membership.
.IP "\fBts_layer_id\fR" 4
.IX Item "ts_layer_id"
Template defining the membership of frames to temporal layers.
.IP "\fBts_layering_mode\fR" 4
.IX Item "ts_layering_mode"
(optional) Selecting the temporal structure from a set of pre-defined temporal layering modes.
Currently supports the following options.
.RS 4
.IP "\fB0\fR" 4
.IX Item "0"
No temporal layering flags are provided internally,
relies on flags being passed in using \f(CW\*(C`metadata\*(C'\fR field in \f(CW\*(C`AVFrame\*(C'\fR
with following keys.
.RS 4
.IP "\fBvp8\-flags\fR" 4
.IX Item "vp8-flags"
Sets the flags passed into the encoder to indicate the referencing scheme for
the current frame.
Refer to function \f(CW\*(C`vpx_codec_encode\*(C'\fR in \f(CW\*(C`vpx/vpx_encoder.h\*(C'\fR for more
details.
.IP "\fBtemporal_id\fR" 4
.IX Item "temporal_id"
Explicitly sets the temporal id of the current frame to encode.
.RE
.RS 4
.RE
.IP "\fB2\fR" 4
.IX Item "2"
Two temporal layers. 0\-1...
.IP "\fB3\fR" 4
.IX Item "3"
Three temporal layers. 0\-2\-1\-2...; with single reference frame.
.IP "\fB4\fR" 4
.IX Item "4"
Same as option \*(L"3\*(R", except there is a dependency between
the two temporal layer 2 frames within the temporal period.
.RE
.RS 4
.RE
.RE
.RS 4
.RE
.IP "\fBVP9\-specific options\fR" 4
.IX Item "VP9-specific options"
.RS 4
.PD 0
.IP "\fBlossless\fR" 4
.IX Item "lossless"
.PD
Enable lossless mode.
.IP "\fBtile-columns\fR" 4
.IX Item "tile-columns"
Set number of tile columns to use. Note this is given as
\&\f(CW\*(C`log2(tile_columns)\*(C'\fR. For example, 8 tile columns would be requested by
setting the \fBtile-columns\fR option to 3.
.IP "\fBtile-rows\fR" 4
.IX Item "tile-rows"
Set number of tile rows to use. Note this is given as \f(CW\*(C`log2(tile_rows)\*(C'\fR.
For example, 4 tile rows would be requested by setting the \fBtile-rows\fR
option to 2.
.IP "\fBframe-parallel\fR" 4
.IX Item "frame-parallel"
Enable frame parallel decodability features.
.IP "\fBaq-mode\fR" 4
.IX Item "aq-mode"
Set adaptive quantization mode (0: off (default), 1: variance 2: complexity, 3:
cyclic refresh, 4: equator360).
.IP "\fBcolorspace\fR \fIcolor-space\fR" 4
.IX Item "colorspace color-space"
Set input color space. The \s-1VP9\s0 bitstream supports signaling the following
colorspaces:
.RS 4
.IP "\fB\fBrgb\fB \f(BIsRGB\fB\fR" 4
.IX Item "rgb sRGB"
.PD 0
.IP "\fB\fBbt709\fB \f(BIbt709\fB\fR" 4
.IX Item "bt709 bt709"
.IP "\fB\fBunspecified\fB \f(BIunknown\fB\fR" 4
.IX Item "unspecified unknown"
.IP "\fB\fBbt470bg\fB \f(BIbt601\fB\fR" 4
.IX Item "bt470bg bt601"
.IP "\fB\fBsmpte170m\fB \f(BIsmpte170\fB\fR" 4
.IX Item "smpte170m smpte170"
.IP "\fB\fBsmpte240m\fB \f(BIsmpte240\fB\fR" 4
.IX Item "smpte240m smpte240"
.IP "\fB\fBbt2020_ncl\fB \f(BIbt2020\fB\fR" 4
.IX Item "bt2020_ncl bt2020"
.RE
.RS 4
.RE
.IP "\fBrow-mt\fR \fIboolean\fR" 4
.IX Item "row-mt boolean"
.PD
Enable row based multi-threading.
.IP "\fBtune-content\fR" 4
.IX Item "tune-content"
Set content type: default (0), screen (1), film (2).
.IP "\fBcorpus-complexity\fR" 4
.IX Item "corpus-complexity"
Corpus \s-1VBR\s0 mode is a variant of standard \s-1VBR\s0 where the complexity distribution
midpoint is passed in rather than calculated for a specific clip or chunk.
.Sp
The valid range is [0, 10000]. 0 (default) uses standard \s-1VBR.\s0
.IP "\fBenable-tpl\fR \fIboolean\fR" 4
.IX Item "enable-tpl boolean"
Enable temporal dependency model.
.IP "\fBref-frame-config\fR" 4
.IX Item "ref-frame-config"
Using per-frame metadata, set members of the structure \f(CW\*(C`vpx_svc_ref_frame_config_t\*(C'\fR in \f(CW\*(C`vpx/vp8cx.h\*(C'\fR to fine-control referencing schemes and frame buffer management.
Use a :\-separated list of key=value pairs.
For example,
.Sp
.Vb 2
\&        av_dict_set(&av_frame\->metadata, "ref\-frame\-config", \e
\&        "rfc_update_buffer_slot=7:rfc_lst_fb_idx=0:rfc_gld_fb_idx=1:rfc_alt_fb_idx=2:rfc_reference_last=0:rfc_reference_golden=0:rfc_reference_alt_ref=0");
.Ve
.RS 4
.IP "\fBrfc_update_buffer_slot\fR" 4
.IX Item "rfc_update_buffer_slot"
Indicates the buffer slot number to update
.IP "\fBrfc_update_last\fR" 4
.IX Item "rfc_update_last"
Indicates whether to update the \s-1LAST\s0 frame
.IP "\fBrfc_update_golden\fR" 4
.IX Item "rfc_update_golden"
Indicates whether to update \s-1GOLDEN\s0 frame
.IP "\fBrfc_update_alt_ref\fR" 4
.IX Item "rfc_update_alt_ref"
Indicates whether to update \s-1ALT_REF\s0 frame
.IP "\fBrfc_lst_fb_idx\fR" 4
.IX Item "rfc_lst_fb_idx"
\&\s-1LAST\s0 frame buffer index
.IP "\fBrfc_gld_fb_idx\fR" 4
.IX Item "rfc_gld_fb_idx"
\&\s-1GOLDEN\s0 frame buffer index
.IP "\fBrfc_alt_fb_idx\fR" 4
.IX Item "rfc_alt_fb_idx"
\&\s-1ALT_REF\s0 frame buffer index
.IP "\fBrfc_reference_last\fR" 4
.IX Item "rfc_reference_last"
Indicates whether to reference \s-1LAST\s0 frame
.IP "\fBrfc_reference_golden\fR" 4
.IX Item "rfc_reference_golden"
Indicates whether to reference \s-1GOLDEN\s0 frame
.IP "\fBrfc_reference_alt_ref\fR" 4
.IX Item "rfc_reference_alt_ref"
Indicates whether to reference \s-1ALT_REF\s0 frame
.IP "\fBrfc_reference_duration\fR" 4
.IX Item "rfc_reference_duration"
Indicates frame duration
.RE
.RS 4
.RE
.RE
.RS 4
.RE
.PP
For more information about libvpx see:
<\fBhttp://www.webmproject.org/\fR>
.SS "libwebp"
.IX Subsection "libwebp"
libwebp WebP Image encoder wrapper
.PP
libwebp is Google's official encoder for WebP images. It can encode in either
lossy or lossless mode. Lossy images are essentially a wrapper around a \s-1VP8\s0
frame. Lossless images are a separate codec developed by Google.
.PP
\fIPixel Format\fR
.IX Subsection "Pixel Format"
.PP
Currently, libwebp only supports \s-1YUV420\s0 for lossy and \s-1RGB\s0 for lossless due
to limitations of the format and libwebp. Alpha is supported for either mode.
Because of \s-1API\s0 limitations, if \s-1RGB\s0 is passed in when encoding lossy or \s-1YUV\s0 is
passed in for encoding lossless, the pixel format will automatically be
converted using functions from libwebp. This is not ideal and is done only for
convenience.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fB\-lossless\fR \fIboolean\fR" 4
.IX Item "-lossless boolean"
Enables/Disables use of lossless mode. Default is 0.
.IP "\fB\-compression_level\fR \fIinteger\fR" 4
.IX Item "-compression_level integer"
For lossy, this is a quality/speed tradeoff. Higher values give better quality
for a given size at the cost of increased encoding time. For lossless, this is
a size/speed tradeoff. Higher values give smaller size at the cost of increased
encoding time. More specifically, it controls the number of extra algorithms
and compression tools used, and varies the combination of these tools. This
maps to the \fImethod\fR option in libwebp. The valid range is 0 to 6.
Default is 4.
.IP "\fB\-qscale\fR \fIfloat\fR" 4
.IX Item "-qscale float"
For lossy encoding, this controls image quality, 0 to 100. For lossless
encoding, this controls the effort and time spent at compressing more. The
default value is 75. Note that for usage via libavcodec, this option is called
\&\fIglobal_quality\fR and must be multiplied by \fI\s-1FF_QP2LAMBDA\s0\fR.
.IP "\fB\-preset\fR \fItype\fR" 4
.IX Item "-preset type"
Configuration preset. This does some automatic settings based on the general
type of the image.
.RS 4
.IP "\fBnone\fR" 4
.IX Item "none"
Do not use a preset.
.IP "\fBdefault\fR" 4
.IX Item "default"
Use the encoder default.
.IP "\fBpicture\fR" 4
.IX Item "picture"
Digital picture, like portrait, inner shot
.IP "\fBphoto\fR" 4
.IX Item "photo"
Outdoor photograph, with natural lighting
.IP "\fBdrawing\fR" 4
.IX Item "drawing"
Hand or line drawing, with high-contrast details
.IP "\fBicon\fR" 4
.IX Item "icon"
Small-sized colorful images
.IP "\fBtext\fR" 4
.IX Item "text"
Text-like
.RE
.RS 4
.RE
.SS "libx264, libx264rgb"
.IX Subsection "libx264, libx264rgb"
x264 H.264/MPEG\-4 \s-1AVC\s0 encoder wrapper.
.PP
This encoder requires the presence of the libx264 headers and library
during configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libx264\*(C'\fR.
.PP
libx264 supports an impressive number of features, including 8x8 and
4x4 adaptive spatial transform, adaptive B\-frame placement, \s-1CAVLC/CABAC\s0
entropy coding, interlacing (\s-1MBAFF\s0), lossless mode, psy optimizations
for detail retention (adaptive quantization, psy-RD, psy-trellis).
.PP
Many libx264 encoder options are mapped to FFmpeg global codec
options, while unique encoder options are provided through private
options. Additionally the \fBx264opts\fR and \fBx264\-params\fR
private options allows one to pass a list of key=value tuples as accepted
by the libx264 \f(CW\*(C`x264_param_parse\*(C'\fR function.
.PP
The x264 project website is at
<\fBhttp://www.videolan.org/developers/x264.html\fR>.
.PP
The libx264rgb encoder is the same as libx264, except it accepts packed \s-1RGB\s0
pixel formats as input instead of \s-1YUV.\s0
.PP
\fISupported Pixel Formats\fR
.IX Subsection "Supported Pixel Formats"
.PP
x264 supports 8\- to 10\-bit color spaces. The exact bit depth is controlled at
x264's configure time.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are supported by the libx264 wrapper. The
\&\fBx264\fR\-equivalent options or values are listed in parentheses
for easy migration.
.PP
To reduce the duplication of documentation, only the private options
and some others requiring special attention are documented here. For
the documentation of the undocumented generic options, see
\&\fBthe Codec Options chapter\fR.
.PP
To get a more accurate and extensive documentation of the libx264
options, invoke the command \fBx264 \-\-fullhelp\fR or consult
the libx264 documentation.
.IP "\fBb (\fR\fIbitrate\fR\fB)\fR" 4
.IX Item "b (bitrate)"
Set bitrate in bits/s. Note that FFmpeg's \fBb\fR option is
expressed in bits/s, while \fBx264\fR's \fBbitrate\fR is in
kilobits/s.
.IP "\fBbf (\fR\fIbframes\fR\fB)\fR" 4
.IX Item "bf (bframes)"
.PD 0
.IP "\fBg (\fR\fIkeyint\fR\fB)\fR" 4
.IX Item "g (keyint)"
.IP "\fBqmin (\fR\fIqpmin\fR\fB)\fR" 4
.IX Item "qmin (qpmin)"
.PD
Minimum quantizer scale.
.IP "\fBqmax (\fR\fIqpmax\fR\fB)\fR" 4
.IX Item "qmax (qpmax)"
Maximum quantizer scale.
.IP "\fBqdiff (\fR\fIqpstep\fR\fB)\fR" 4
.IX Item "qdiff (qpstep)"
Maximum difference between quantizer scales.
.IP "\fBqblur (\fR\fIqblur\fR\fB)\fR" 4
.IX Item "qblur (qblur)"
Quantizer curve blur
.IP "\fBqcomp (\fR\fIqcomp\fR\fB)\fR" 4
.IX Item "qcomp (qcomp)"
Quantizer curve compression factor
.IP "\fBrefs (\fR\fIref\fR\fB)\fR" 4
.IX Item "refs (ref)"
Number of reference frames each P\-frame can use. The range is from \fI0\-16\fR.
.IP "\fBsc_threshold (\fR\fIscenecut\fR\fB)\fR" 4
.IX Item "sc_threshold (scenecut)"
Sets the threshold for the scene change detection.
.IP "\fBtrellis (\fR\fItrellis\fR\fB)\fR" 4
.IX Item "trellis (trellis)"
Performs Trellis quantization to increase efficiency. Enabled by default.
.IP "\fBnr  (\fR\fInr\fR\fB)\fR" 4
.IX Item "nr (nr)"
.PD 0
.IP "\fBme_range (\fR\fImerange\fR\fB)\fR" 4
.IX Item "me_range (merange)"
.PD
Maximum range of the motion search in pixels.
.IP "\fBme_method (\fR\fIme\fR\fB)\fR" 4
.IX Item "me_method (me)"
Set motion estimation method. Possible values in the decreasing order
of speed:
.RS 4
.IP "\fBdia (\fR\fIdia\fR\fB)\fR" 4
.IX Item "dia (dia)"
.PD 0
.IP "\fBepzs (\fR\fIdia\fR\fB)\fR" 4
.IX Item "epzs (dia)"
.PD
Diamond search with radius 1 (fastest). \fBepzs\fR is an alias for
\&\fBdia\fR.
.IP "\fBhex (\fR\fIhex\fR\fB)\fR" 4
.IX Item "hex (hex)"
Hexagonal search with radius 2.
.IP "\fBumh (\fR\fIumh\fR\fB)\fR" 4
.IX Item "umh (umh)"
Uneven multi-hexagon search.
.IP "\fBesa (\fR\fIesa\fR\fB)\fR" 4
.IX Item "esa (esa)"
Exhaustive search.
.IP "\fBtesa (\fR\fItesa\fR\fB)\fR" 4
.IX Item "tesa (tesa)"
Hadamard exhaustive search (slowest).
.RE
.RS 4
.RE
.IP "\fBforced-idr\fR" 4
.IX Item "forced-idr"
Normally, when forcing a I\-frame type, the encoder can select any type
of I\-frame. This option forces it to choose an IDR-frame.
.IP "\fBsubq (\fR\fIsubme\fR\fB)\fR" 4
.IX Item "subq (subme)"
Sub-pixel motion estimation method.
.IP "\fBb_strategy (\fR\fIb\-adapt\fR\fB)\fR" 4
.IX Item "b_strategy (b-adapt)"
Adaptive B\-frame placement decision algorithm. Use only on first-pass.
.IP "\fBkeyint_min (\fR\fImin-keyint\fR\fB)\fR" 4
.IX Item "keyint_min (min-keyint)"
Minimum \s-1GOP\s0 size.
.IP "\fBcoder\fR" 4
.IX Item "coder"
Set entropy encoder. Possible values:
.RS 4
.IP "\fBac\fR" 4
.IX Item "ac"
Enable \s-1CABAC.\s0
.IP "\fBvlc\fR" 4
.IX Item "vlc"
Enable \s-1CAVLC\s0 and disable \s-1CABAC.\s0 It generates the same effect as
\&\fBx264\fR's \fB\-\-no\-cabac\fR option.
.RE
.RS 4
.RE
.IP "\fBcmp\fR" 4
.IX Item "cmp"
Set full pixel motion estimation comparison algorithm. Possible values:
.RS 4
.IP "\fBchroma\fR" 4
.IX Item "chroma"
Enable chroma in motion estimation.
.IP "\fBsad\fR" 4
.IX Item "sad"
Ignore chroma in motion estimation. It generates the same effect as
\&\fBx264\fR's \fB\-\-no\-chroma\-me\fR option.
.RE
.RS 4
.RE
.IP "\fBthreads (\fR\fIthreads\fR\fB)\fR" 4
.IX Item "threads (threads)"
Number of encoding threads.
.IP "\fBthread_type\fR" 4
.IX Item "thread_type"
Set multithreading technique. Possible values:
.RS 4
.IP "\fBslice\fR" 4
.IX Item "slice"
Slice-based multithreading. It generates the same effect as
\&\fBx264\fR's \fB\-\-sliced\-threads\fR option.
.IP "\fBframe\fR" 4
.IX Item "frame"
Frame-based multithreading.
.RE
.RS 4
.RE
.IP "\fBflags\fR" 4
.IX Item "flags"
Set encoding flags. It can be used to disable closed \s-1GOP\s0 and enable
open \s-1GOP\s0 by setting it to \f(CW\*(C`\-cgop\*(C'\fR. The result is similar to
the behavior of \fBx264\fR's \fB\-\-open\-gop\fR option.
.IP "\fBrc_init_occupancy (\fR\fIvbv-init\fR\fB)\fR" 4
.IX Item "rc_init_occupancy (vbv-init)"
.PD 0
.IP "\fBpreset (\fR\fIpreset\fR\fB)\fR" 4
.IX Item "preset (preset)"
.PD
Set the encoding preset.
.IP "\fBtune (\fR\fItune\fR\fB)\fR" 4
.IX Item "tune (tune)"
Set tuning of the encoding params.
.IP "\fBprofile (\fR\fIprofile\fR\fB)\fR" 4
.IX Item "profile (profile)"
Set profile restrictions.
.IP "\fBfastfirstpass\fR" 4
.IX Item "fastfirstpass"
Enable fast settings when encoding first pass, when set to 1. When set
to 0, it has the same effect of \fBx264\fR's
\&\fB\-\-slow\-firstpass\fR option.
.IP "\fBcrf (\fR\fIcrf\fR\fB)\fR" 4
.IX Item "crf (crf)"
Set the quality for constant quality mode.
.IP "\fBcrf_max (\fR\fIcrf-max\fR\fB)\fR" 4
.IX Item "crf_max (crf-max)"
In \s-1CRF\s0 mode, prevents \s-1VBV\s0 from lowering quality beyond this point.
.IP "\fBqp (\fR\fIqp\fR\fB)\fR" 4
.IX Item "qp (qp)"
Set constant quantization rate control method parameter.
.IP "\fBaq-mode (\fR\fIaq-mode\fR\fB)\fR" 4
.IX Item "aq-mode (aq-mode)"
Set \s-1AQ\s0 method. Possible values:
.RS 4
.IP "\fBnone (\fR\fI0\fR\fB)\fR" 4
.IX Item "none (0)"
Disabled.
.IP "\fBvariance (\fR\fI1\fR\fB)\fR" 4
.IX Item "variance (1)"
Variance \s-1AQ\s0 (complexity mask).
.IP "\fBautovariance (\fR\fI2\fR\fB)\fR" 4
.IX Item "autovariance (2)"
Auto-variance \s-1AQ\s0 (experimental).
.RE
.RS 4
.RE
.IP "\fBaq-strength (\fR\fIaq-strength\fR\fB)\fR" 4
.IX Item "aq-strength (aq-strength)"
Set \s-1AQ\s0 strength, reduce blocking and blurring in flat and textured areas.
.IP "\fBpsy\fR" 4
.IX Item "psy"
Use psychovisual optimizations when set to 1. When set to 0, it has the
same effect as \fBx264\fR's \fB\-\-no\-psy\fR option.
.IP "\fBpsy-rd  (\fR\fIpsy-rd\fR\fB)\fR" 4
.IX Item "psy-rd (psy-rd)"
Set strength of psychovisual optimization, in
\&\fIpsy-rd\fR:\fIpsy-trellis\fR format.
.IP "\fBrc-lookahead (\fR\fIrc-lookahead\fR\fB)\fR" 4
.IX Item "rc-lookahead (rc-lookahead)"
Set number of frames to look ahead for frametype and ratecontrol.
.IP "\fBweightb\fR" 4
.IX Item "weightb"
Enable weighted prediction for B\-frames when set to 1. When set to 0,
it has the same effect as \fBx264\fR's \fB\-\-no\-weightb\fR option.
.IP "\fBweightp (\fR\fIweightp\fR\fB)\fR" 4
.IX Item "weightp (weightp)"
Set weighted prediction method for P\-frames. Possible values:
.RS 4
.IP "\fBnone (\fR\fI0\fR\fB)\fR" 4
.IX Item "none (0)"
Disabled
.IP "\fBsimple (\fR\fI1\fR\fB)\fR" 4
.IX Item "simple (1)"
Enable only weighted refs
.IP "\fBsmart (\fR\fI2\fR\fB)\fR" 4
.IX Item "smart (2)"
Enable both weighted refs and duplicates
.RE
.RS 4
.RE
.IP "\fBssim (\fR\fIssim\fR\fB)\fR" 4
.IX Item "ssim (ssim)"
Enable calculation and printing \s-1SSIM\s0 stats after the encoding.
.IP "\fBintra-refresh (\fR\fIintra-refresh\fR\fB)\fR" 4
.IX Item "intra-refresh (intra-refresh)"
Enable the use of Periodic Intra Refresh instead of \s-1IDR\s0 frames when set
to 1.
.IP "\fBavcintra-class (\fR\fIclass\fR\fB)\fR" 4
.IX Item "avcintra-class (class)"
Configure the encoder to generate AVC-Intra.
Valid values are 50,100 and 200
.IP "\fBbluray-compat (\fR\fIbluray-compat\fR\fB)\fR" 4
.IX Item "bluray-compat (bluray-compat)"
Configure the encoder to be compatible with the bluray standard.
It is a shorthand for setting \*(L"bluray\-compat=1 force\-cfr=1\*(R".
.IP "\fBb\-bias (\fR\fIb\-bias\fR\fB)\fR" 4
.IX Item "b-bias (b-bias)"
Set the influence on how often B\-frames are used.
.IP "\fBb\-pyramid (\fR\fIb\-pyramid\fR\fB)\fR" 4
.IX Item "b-pyramid (b-pyramid)"
Set method for keeping of some B\-frames as references. Possible values:
.RS 4
.IP "\fBnone (\fR\fInone\fR\fB)\fR" 4
.IX Item "none (none)"
Disabled.
.IP "\fBstrict (\fR\fIstrict\fR\fB)\fR" 4
.IX Item "strict (strict)"
Strictly hierarchical pyramid.
.IP "\fBnormal (\fR\fInormal\fR\fB)\fR" 4
.IX Item "normal (normal)"
Non-strict (not Blu-ray compatible).
.RE
.RS 4
.RE
.IP "\fBmixed-refs\fR" 4
.IX Item "mixed-refs"
Enable the use of one reference per partition, as opposed to one
reference per macroblock when set to 1. When set to 0, it has the
same effect as \fBx264\fR's \fB\-\-no\-mixed\-refs\fR option.
.IP "\fB8x8dct\fR" 4
.IX Item "8x8dct"
Enable adaptive spatial transform (high profile 8x8 transform)
when set to 1. When set to 0, it has the same effect as
\&\fBx264\fR's \fB\-\-no\-8x8dct\fR option.
.IP "\fBfast-pskip\fR" 4
.IX Item "fast-pskip"
Enable early \s-1SKIP\s0 detection on P\-frames when set to 1. When set
to 0, it has the same effect as \fBx264\fR's
\&\fB\-\-no\-fast\-pskip\fR option.
.IP "\fBaud (\fR\fIaud\fR\fB)\fR" 4
.IX Item "aud (aud)"
Enable use of access unit delimiters when set to 1.
.IP "\fBmbtree\fR" 4
.IX Item "mbtree"
Enable use macroblock tree ratecontrol when set to 1. When set
to 0, it has the same effect as \fBx264\fR's
\&\fB\-\-no\-mbtree\fR option.
.IP "\fBdeblock (\fR\fIdeblock\fR\fB)\fR" 4
.IX Item "deblock (deblock)"
Set loop filter parameters, in \fIalpha\fR:\fIbeta\fR form.
.IP "\fBcplxblur (\fR\fIcplxblur\fR\fB)\fR" 4
.IX Item "cplxblur (cplxblur)"
Set fluctuations reduction in \s-1QP\s0 (before curve compression).
.IP "\fBpartitions (\fR\fIpartitions\fR\fB)\fR" 4
.IX Item "partitions (partitions)"
Set partitions to consider as a comma-separated list of. Possible
values in the list:
.RS 4
.IP "\fBp8x8\fR" 4
.IX Item "p8x8"
8x8 P\-frame partition.
.IP "\fBp4x4\fR" 4
.IX Item "p4x4"
4x4 P\-frame partition.
.IP "\fBb8x8\fR" 4
.IX Item "b8x8"
4x4 B\-frame partition.
.IP "\fBi8x8\fR" 4
.IX Item "i8x8"
8x8 I\-frame partition.
.IP "\fBi4x4\fR" 4
.IX Item "i4x4"
4x4 I\-frame partition.
(Enabling \fBp4x4\fR requires \fBp8x8\fR to be enabled. Enabling
\&\fBi8x8\fR requires adaptive spatial transform (\fB8x8dct\fR
option) to be enabled.)
.IP "\fBnone (\fR\fInone\fR\fB)\fR" 4
.IX Item "none (none)"
Do not consider any partitions.
.IP "\fBall (\fR\fIall\fR\fB)\fR" 4
.IX Item "all (all)"
Consider every partition.
.RE
.RS 4
.RE
.IP "\fBdirect-pred (\fR\fIdirect\fR\fB)\fR" 4
.IX Item "direct-pred (direct)"
Set direct \s-1MV\s0 prediction mode. Possible values:
.RS 4
.IP "\fBnone (\fR\fInone\fR\fB)\fR" 4
.IX Item "none (none)"
Disable \s-1MV\s0 prediction.
.IP "\fBspatial (\fR\fIspatial\fR\fB)\fR" 4
.IX Item "spatial (spatial)"
Enable spatial predicting.
.IP "\fBtemporal (\fR\fItemporal\fR\fB)\fR" 4
.IX Item "temporal (temporal)"
Enable temporal predicting.
.IP "\fBauto (\fR\fIauto\fR\fB)\fR" 4
.IX Item "auto (auto)"
Automatically decided.
.RE
.RS 4
.RE
.IP "\fBslice-max-size (\fR\fIslice-max-size\fR\fB)\fR" 4
.IX Item "slice-max-size (slice-max-size)"
Set the limit of the size of each slice in bytes. If not specified
but \s-1RTP\s0 payload size (\fBps\fR) is specified, that is used.
.IP "\fBstats (\fR\fIstats\fR\fB)\fR" 4
.IX Item "stats (stats)"
Set the file name for multi-pass stats.
.IP "\fBnal-hrd (\fR\fInal-hrd\fR\fB)\fR" 4
.IX Item "nal-hrd (nal-hrd)"
Set signal \s-1HRD\s0 information (requires \fBvbv-bufsize\fR to be set).
Possible values:
.RS 4
.IP "\fBnone (\fR\fInone\fR\fB)\fR" 4
.IX Item "none (none)"
Disable \s-1HRD\s0 information signaling.
.IP "\fBvbr (\fR\fIvbr\fR\fB)\fR" 4
.IX Item "vbr (vbr)"
Variable bit rate.
.IP "\fBcbr (\fR\fIcbr\fR\fB)\fR" 4
.IX Item "cbr (cbr)"
Constant bit rate (not allowed in \s-1MP4\s0 container).
.RE
.RS 4
.RE
.IP "\fBx264opts (N.A.)\fR" 4
.IX Item "x264opts (N.A.)"
Set any x264 option, see \fBx264 \-\-fullhelp\fR for a list.
.Sp
Argument is a list of \fIkey\fR=\fIvalue\fR couples separated by
\&\*(L":\*(R". In \fIfilter\fR and \fIpsy-rd\fR options that use \*(L":\*(R" as a separator
themselves, use \*(L",\*(R" instead. They accept it as well since long ago but this
is kept undocumented for some reason.
.Sp
For example to specify libx264 encoding options with \fBffmpeg\fR:
.Sp
.Vb 1
\&        ffmpeg \-i foo.mpg \-c:v libx264 \-x264opts keyint=123:min\-keyint=20 \-an out.mkv
.Ve
.IP "\fBa53cc\fR \fIboolean\fR" 4
.IX Item "a53cc boolean"
Import closed captions (which must be \s-1ATSC\s0 compatible format) into output.
Only the mpeg2 and h264 decoders provide these. Default is 1 (on).
.IP "\fBx264\-params (N.A.)\fR" 4
.IX Item "x264-params (N.A.)"
Override the x264 configuration using a :\-separated list of key=value
parameters.
.Sp
This option is functionally the same as the \fBx264opts\fR, but is
duplicated for compatibility with the Libav fork.
.Sp
For example to specify libx264 encoding options with \fBffmpeg\fR:
.Sp
.Vb 3
\&        ffmpeg \-i INPUT \-c:v libx264 \-x264\-params level=30:bframes=0:weightp=0:\e
\&        cabac=0:ref=1:vbv\-maxrate=768:vbv\-bufsize=2000:analyse=all:me=umh:\e
\&        no\-fast\-pskip=1:subq=6:8x8dct=0:trellis=0 OUTPUT
.Ve
.PP
Encoding ffpresets for common usages are provided so they can be used with the
general presets system (e.g. passing the \fBpre\fR option).
.SS "libx265"
.IX Subsection "libx265"
x265 H.265/HEVC encoder wrapper.
.PP
This encoder requires the presence of the libx265 headers and library
during configuration. You need to explicitly configure the build with
\&\fB\-\-enable\-libx265\fR.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBb\fR" 4
.IX Item "b"
Sets target video bitrate.
.IP "\fBbf\fR" 4
.IX Item "bf"
.PD 0
.IP "\fBg\fR" 4
.IX Item "g"
.PD
Set the \s-1GOP\s0 size.
.IP "\fBkeyint_min\fR" 4
.IX Item "keyint_min"
Minimum \s-1GOP\s0 size.
.IP "\fBrefs\fR" 4
.IX Item "refs"
Number of reference frames each P\-frame can use. The range is from \fI1\-16\fR.
.IP "\fBpreset\fR" 4
.IX Item "preset"
Set the x265 preset.
.IP "\fBtune\fR" 4
.IX Item "tune"
Set the x265 tune parameter.
.IP "\fBprofile\fR" 4
.IX Item "profile"
Set profile restrictions.
.IP "\fBcrf\fR" 4
.IX Item "crf"
Set the quality for constant quality mode.
.IP "\fBqp\fR" 4
.IX Item "qp"
Set constant quantization rate control method parameter.
.IP "\fBqmin\fR" 4
.IX Item "qmin"
Minimum quantizer scale.
.IP "\fBqmax\fR" 4
.IX Item "qmax"
Maximum quantizer scale.
.IP "\fBqdiff\fR" 4
.IX Item "qdiff"
Maximum difference between quantizer scales.
.IP "\fBqblur\fR" 4
.IX Item "qblur"
Quantizer curve blur
.IP "\fBqcomp\fR" 4
.IX Item "qcomp"
Quantizer curve compression factor
.IP "\fBi_qfactor\fR" 4
.IX Item "i_qfactor"
.PD 0
.IP "\fBb_qfactor\fR" 4
.IX Item "b_qfactor"
.IP "\fBforced-idr\fR" 4
.IX Item "forced-idr"
.PD
Normally, when forcing a I\-frame type, the encoder can select any type
of I\-frame. This option forces it to choose an IDR-frame.
.IP "\fBx265\-params\fR" 4
.IX Item "x265-params"
Set x265 options using a list of \fIkey\fR=\fIvalue\fR couples separated
by \*(L":\*(R". See \fBx265 \-\-help\fR for a list of options.
.Sp
For example to specify libx265 encoding options with \fB\-x265\-params\fR:
.Sp
.Vb 1
\&        ffmpeg \-i input \-c:v libx265 \-x265\-params crf=26:psy\-rd=1 output.mp4
.Ve
.SS "libxavs2"
.IX Subsection "libxavs2"
xavs2 \s-1AVS2\-P2/IEEE1857.4\s0 encoder wrapper.
.PP
This encoder requires the presence of the libxavs2 headers and library
during configuration. You need to explicitly configure the build with
\&\fB\-\-enable\-libxavs2\fR.
.PP
The following standard libavcodec options are used:
.IP "\(bu" 4
\&\fBb\fR / \fBbit_rate\fR
.IP "\(bu" 4
\&\fBg\fR / \fBgop_size\fR
.IP "\(bu" 4
\&\fBbf\fR / \fBmax_b_frames\fR
.PP
The encoder also has its own specific options:
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBlcu_row_threads\fR" 4
.IX Item "lcu_row_threads"
Set the number of parallel threads for rows from 1 to 8 (default 5).
.IP "\fBinitial_qp\fR" 4
.IX Item "initial_qp"
Set the xavs2 quantization parameter from 1 to 63 (default 34). This is
used to set the initial qp for the first frame.
.IP "\fBqp\fR" 4
.IX Item "qp"
Set the xavs2 quantization parameter from 1 to 63 (default 34). This is
used to set the qp value under constant-QP mode.
.IP "\fBmax_qp\fR" 4
.IX Item "max_qp"
Set the max qp for rate control from 1 to 63 (default 55).
.IP "\fBmin_qp\fR" 4
.IX Item "min_qp"
Set the min qp for rate control from 1 to 63 (default 20).
.IP "\fBspeed_level\fR" 4
.IX Item "speed_level"
Set the Speed level from 0 to 9 (default 0). Higher is better but slower.
.IP "\fBlog_level\fR" 4
.IX Item "log_level"
Set the log level from \-1 to 3 (default 0). \-1: none, 0: error,
1: warning, 2: info, 3: debug.
.IP "\fBxavs2\-params\fR" 4
.IX Item "xavs2-params"
Set xavs2 options using a list of \fIkey\fR=\fIvalue\fR couples separated
by \*(L":\*(R".
.Sp
For example to specify libxavs2 encoding options with \fB\-xavs2\-params\fR:
.Sp
.Vb 1
\&        ffmpeg \-i input \-c:v libxavs2 \-xavs2\-params RdoqLevel=0 output.avs2
.Ve
.SS "libxvid"
.IX Subsection "libxvid"
Xvid \s-1MPEG\-4\s0 Part 2 encoder wrapper.
.PP
This encoder requires the presence of the libxvidcore headers and library
during configuration. You need to explicitly configure the build with
\&\f(CW\*(C`\-\-enable\-libxvid \-\-enable\-gpl\*(C'\fR.
.PP
The native \f(CW\*(C`mpeg4\*(C'\fR encoder supports the \s-1MPEG\-4\s0 Part 2 format, so
users can encode to this format without this library.
.PP
\fIOptions\fR
.IX Subsection "Options"
.PP
The following options are supported by the libxvid wrapper. Some of
the following options are listed but are not documented, and
correspond to shared codec options. See \fBthe Codec
Options chapter\fR for their documentation. The other shared options
which are not listed have no effect for the libxvid encoder.
.IP "\fBb\fR" 4
.IX Item "b"
.PD 0
.IP "\fBg\fR" 4
.IX Item "g"
.IP "\fBqmin\fR" 4
.IX Item "qmin"
.IP "\fBqmax\fR" 4
.IX Item "qmax"
.IP "\fBmpeg_quant\fR" 4
.IX Item "mpeg_quant"
.IP "\fBthreads\fR" 4
.IX Item "threads"
.IP "\fBbf\fR" 4
.IX Item "bf"
.IP "\fBb_qfactor\fR" 4
.IX Item "b_qfactor"
.IP "\fBb_qoffset\fR" 4
.IX Item "b_qoffset"
.IP "\fBflags\fR" 4
.IX Item "flags"
.PD
Set specific encoding flags. Possible values:
.RS 4
.IP "\fBmv4\fR" 4
.IX Item "mv4"
Use four motion vector by macroblock.
.IP "\fBaic\fR" 4
.IX Item "aic"
Enable high quality \s-1AC\s0 prediction.
.IP "\fBgray\fR" 4
.IX Item "gray"
Only encode grayscale.
.IP "\fBgmc\fR" 4
.IX Item "gmc"
Enable the use of global motion compensation (\s-1GMC\s0).
.IP "\fBqpel\fR" 4
.IX Item "qpel"
Enable quarter-pixel motion compensation.
.IP "\fBcgop\fR" 4
.IX Item "cgop"
Enable closed \s-1GOP.\s0
.IP "\fBglobal_header\fR" 4
.IX Item "global_header"
Place global headers in extradata instead of every keyframe.
.RE
.RS 4
.RE
.IP "\fBtrellis\fR" 4
.IX Item "trellis"
.PD 0
.IP "\fBme_method\fR" 4
.IX Item "me_method"
.PD
Set motion estimation method. Possible values in decreasing order of
speed and increasing order of quality:
.RS 4
.IP "\fBzero\fR" 4
.IX Item "zero"
Use no motion estimation (default).
.IP "\fBphods\fR" 4
.IX Item "phods"
.PD 0
.IP "\fBx1\fR" 4
.IX Item "x1"
.IP "\fBlog\fR" 4
.IX Item "log"
.PD
Enable advanced diamond zonal search for 16x16 blocks and half-pixel
refinement for 16x16 blocks. \fBx1\fR and \fBlog\fR are aliases for
\&\fBphods\fR.
.IP "\fBepzs\fR" 4
.IX Item "epzs"
Enable all of the things described above, plus advanced diamond zonal
search for 8x8 blocks, half-pixel refinement for 8x8 blocks, and motion
estimation on chroma planes.
.IP "\fBfull\fR" 4
.IX Item "full"
Enable all of the things described above, plus extended 16x16 and 8x8
blocks search.
.RE
.RS 4
.RE
.IP "\fBmbd\fR" 4
.IX Item "mbd"
Set macroblock decision algorithm. Possible values in the increasing
order of quality:
.RS 4
.IP "\fBsimple\fR" 4
.IX Item "simple"
Use macroblock comparing function algorithm (default).
.IP "\fBbits\fR" 4
.IX Item "bits"
Enable rate distortion-based half pixel and quarter pixel refinement for
16x16 blocks.
.IP "\fBrd\fR" 4
.IX Item "rd"
Enable all of the things described above, plus rate distortion-based
half pixel and quarter pixel refinement for 8x8 blocks, and rate
distortion-based search using square pattern.
.RE
.RS 4
.RE
.IP "\fBlumi_aq\fR" 4
.IX Item "lumi_aq"
Enable lumi masking adaptive quantization when set to 1. Default is 0
(disabled).
.IP "\fBvariance_aq\fR" 4
.IX Item "variance_aq"
Enable variance adaptive quantization when set to 1. Default is 0
(disabled).
.Sp
When combined with \fBlumi_aq\fR, the resulting quality will not
be better than any of the two specified individually. In other
words, the resulting quality will be the worse one of the two
effects.
.IP "\fBssim\fR" 4
.IX Item "ssim"
Set structural similarity (\s-1SSIM\s0) displaying method. Possible values:
.RS 4
.IP "\fBoff\fR" 4
.IX Item "off"
Disable displaying of \s-1SSIM\s0 information.
.IP "\fBavg\fR" 4
.IX Item "avg"
Output average \s-1SSIM\s0 at the end of encoding to stdout. The format of
showing the average \s-1SSIM\s0 is:
.Sp
.Vb 1
\&        Average SSIM: %f
.Ve
.Sp
For users who are not familiar with C, \f(CW%f\fR means a float number, or
a decimal (e.g. 0.939232).
.IP "\fBframe\fR" 4
.IX Item "frame"
Output both per-frame \s-1SSIM\s0 data during encoding and average \s-1SSIM\s0 at
the end of encoding to stdout. The format of per-frame information
is:
.Sp
.Vb 1
\&               SSIM: avg: %1.3f min: %1.3f max: %1.3f
.Ve
.Sp
For users who are not familiar with C, \f(CW%1\fR.3f means a float number
rounded to 3 digits after the dot (e.g. 0.932).
.RE
.RS 4
.RE
.IP "\fBssim_acc\fR" 4
.IX Item "ssim_acc"
Set \s-1SSIM\s0 accuracy. Valid options are integers within the range of
0\-4, while 0 gives the most accurate result and 4 computes the
fastest.
.SS "MediaFoundation"
.IX Subsection "MediaFoundation"
This provides wrappers to encoders (both audio and video) in the
MediaFoundation framework. It can access both \s-1SW\s0 and \s-1HW\s0 encoders.
Video encoders can take input in either of nv12 or yuv420p form
(some encoders support both, some support only either \- in practice,
nv12 is the safer choice, especially among \s-1HW\s0 encoders).
.SS "mpeg2"
.IX Subsection "mpeg2"
\&\s-1MPEG\-2\s0 video encoder.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBprofile\fR" 4
.IX Item "profile"
Select the mpeg2 profile to encode:
.RS 4
.IP "\fB422\fR" 4
.IX Item "422"
.PD 0
.IP "\fBhigh\fR" 4
.IX Item "high"
.IP "\fBss\fR" 4
.IX Item "ss"
.PD
Spatially Scalable
.IP "\fBsnr\fR" 4
.IX Item "snr"
\&\s-1SNR\s0 Scalable
.IP "\fBmain\fR" 4
.IX Item "main"
.PD 0
.IP "\fBsimple\fR" 4
.IX Item "simple"
.RE
.RS 4
.RE
.IP "\fBlevel\fR" 4
.IX Item "level"
.PD
Select the mpeg2 level to encode:
.RS 4
.IP "\fBhigh\fR" 4
.IX Item "high"
.PD 0
.IP "\fBhigh1440\fR" 4
.IX Item "high1440"
.IP "\fBmain\fR" 4
.IX Item "main"
.IP "\fBlow\fR" 4
.IX Item "low"
.RE
.RS 4
.RE
.IP "\fBseq_disp_ext\fR \fIinteger\fR" 4
.IX Item "seq_disp_ext integer"
.PD
Specifies if the encoder should write a sequence_display_extension to the
output.
.RS 4
.IP "\fB\-1\fR" 4
.IX Item "-1"
.PD 0
.IP "\fBauto\fR" 4
.IX Item "auto"
.PD
Decide automatically to write it or not (this is the default) by checking if
the data to be written is different from the default or unspecified values.
.IP "\fB0\fR" 4
.IX Item "0"
.PD 0
.IP "\fBnever\fR" 4
.IX Item "never"
.PD
Never write it.
.IP "\fB1\fR" 4
.IX Item "1"
.PD 0
.IP "\fBalways\fR" 4
.IX Item "always"
.PD
Always write it.
.RE
.RS 4
.RE
.IP "\fBvideo_format\fR \fIinteger\fR" 4
.IX Item "video_format integer"
Specifies the video_format written into the sequence display extension
indicating the source of the video pictures. The default is \fBunspecified\fR,
can be \fBcomponent\fR, \fBpal\fR, \fBntsc\fR, \fBsecam\fR or \fBmac\fR.
For maximum compatibility, use \fBcomponent\fR.
.IP "\fBa53cc\fR \fIboolean\fR" 4
.IX Item "a53cc boolean"
Import closed captions (which must be \s-1ATSC\s0 compatible format) into output.
Default is 1 (on).
.SS "png"
.IX Subsection "png"
\&\s-1PNG\s0 image encoder.
.PP
\fIPrivate options\fR
.IX Subsection "Private options"
.IP "\fBdpi\fR \fIinteger\fR" 4
.IX Item "dpi integer"
Set physical density of pixels, in dots per inch, unset by default
.IP "\fBdpm\fR \fIinteger\fR" 4
.IX Item "dpm integer"
Set physical density of pixels, in dots per meter, unset by default
.SS "ProRes"
.IX Subsection "ProRes"
Apple ProRes encoder.
.PP
FFmpeg contains 2 ProRes encoders, the prores-aw and prores-ks encoder.
The used encoder can be chosen with the \f(CW\*(C`\-vcodec\*(C'\fR option.
.PP
\fIPrivate Options for prores-ks\fR
.IX Subsection "Private Options for prores-ks"
.IP "\fBprofile\fR \fIinteger\fR" 4
.IX Item "profile integer"
Select the ProRes profile to encode
.RS 4
.IP "\fBproxy\fR" 4
.IX Item "proxy"
.PD 0
.IP "\fBlt\fR" 4
.IX Item "lt"
.IP "\fBstandard\fR" 4
.IX Item "standard"
.IP "\fBhq\fR" 4
.IX Item "hq"
.IP "\fB4444\fR" 4
.IX Item "4444"
.IP "\fB4444xq\fR" 4
.IX Item "4444xq"
.RE
.RS 4
.RE
.IP "\fBquant_mat\fR \fIinteger\fR" 4
.IX Item "quant_mat integer"
.PD
Select quantization matrix.
.RS 4
.IP "\fBauto\fR" 4
.IX Item "auto"
.PD 0
.IP "\fBdefault\fR" 4
.IX Item "default"
.IP "\fBproxy\fR" 4
.IX Item "proxy"
.IP "\fBlt\fR" 4
.IX Item "lt"
.IP "\fBstandard\fR" 4
.IX Item "standard"
.IP "\fBhq\fR" 4
.IX Item "hq"
.RE
.RS 4
.PD
.Sp
If set to \fIauto\fR, the matrix matching the profile will be picked.
If not set, the matrix providing the highest quality, \fIdefault\fR, will be
picked.
.RE
.IP "\fBbits_per_mb\fR \fIinteger\fR" 4
.IX Item "bits_per_mb integer"
How many bits to allot for coding one macroblock. Different profiles use
between 200 and 2400 bits per macroblock, the maximum is 8000.
.IP "\fBmbs_per_slice\fR \fIinteger\fR" 4
.IX Item "mbs_per_slice integer"
Number of macroblocks in each slice (1\-8); the default value (8)
should be good in almost all situations.
.IP "\fBvendor\fR \fIstring\fR" 4
.IX Item "vendor string"
Override the 4\-byte vendor \s-1ID.
A\s0 custom vendor \s-1ID\s0 like \fIapl0\fR would claim the stream was produced by
the Apple encoder.
.IP "\fBalpha_bits\fR \fIinteger\fR" 4
.IX Item "alpha_bits integer"
Specify number of bits for alpha component.
Possible values are \fI0\fR, \fI8\fR and \fI16\fR.
Use \fI0\fR to disable alpha plane coding.
.PP
\fISpeed considerations\fR
.IX Subsection "Speed considerations"
.PP
In the default mode of operation the encoder has to honor frame constraints
(i.e. not produce frames with size bigger than requested) while still making
output picture as good as possible.
A frame containing a lot of small details is harder to compress and the encoder
would spend more time searching for appropriate quantizers for each slice.
.PP
Setting a higher \fBbits_per_mb\fR limit will improve the speed.
.PP
For the fastest encoding speed set the \fBqscale\fR parameter (4 is the
recommended value) and do not set a size constraint.
.SS "\s-1QSV\s0 encoders"
.IX Subsection "QSV encoders"
The family of Intel QuickSync Video encoders (\s-1MPEG\-2, H.264, HEVC, JPEG/MJPEG\s0 and \s-1VP9\s0)
.PP
The ratecontrol method is selected as follows:
.IP "\(bu" 4
When \fBglobal_quality\fR is specified, a quality-based mode is used.
Specifically this means either
.RS 4
.IP "\-" 4
\&\fI\s-1CQP\s0\fR \- constant quantizer scale, when the \fBqscale\fR codec flag is
also set (the \fB\-qscale\fR ffmpeg option).
.IP "\-" 4
\&\fI\s-1LA_ICQ\s0\fR \- intelligent constant quality with lookahead, when the
\&\fBlook_ahead\fR option is also set.
.IP "\-" 4
\&\fI\s-1ICQ\s0\fR \*(-- intelligent constant quality otherwise.
.RE
.RS 4
.RE
.IP "\(bu" 4
Otherwise, a bitrate-based mode is used. For all of those, you should specify at
least the desired average bitrate with the \fBb\fR option.
.RS 4
.IP "\-" 4
\&\fI\s-1LA\s0\fR \- \s-1VBR\s0 with lookahead, when the \fBlook_ahead\fR option is specified.
.IP "\-" 4
\&\fI\s-1VCM\s0\fR \- video conferencing mode, when the \fBvcm\fR option is set.
.IP "\-" 4
\&\fI\s-1CBR\s0\fR \- constant bitrate, when \fBmaxrate\fR is specified and equal to
the average bitrate.
.IP "\-" 4
\&\fI\s-1VBR\s0\fR \- variable bitrate, when \fBmaxrate\fR is specified, but is higher
than the average bitrate.
.IP "\-" 4
\&\fI\s-1AVBR\s0\fR \- average \s-1VBR\s0 mode, when \fBmaxrate\fR is not specified. This mode
is further configured by the \fBavbr_accuracy\fR and
\&\fBavbr_convergence\fR options.
.RE
.RS 4
.RE
.PP
Note that depending on your system, a different mode than the one you specified
may be selected by the encoder. Set the verbosity level to \fIverbose\fR or
higher to see the actual settings used by the \s-1QSV\s0 runtime.
.PP
Additional libavcodec global options are mapped to \s-1MSDK\s0 options as follows:
.IP "\(bu" 4
\&\fBg/gop_size\fR \-> \fBGopPicSize\fR
.IP "\(bu" 4
\&\fBbf/max_b_frames\fR+1 \-> \fBGopRefDist\fR
.IP "\(bu" 4
\&\fBrc_init_occupancy/rc_initial_buffer_occupancy\fR \->
\&\fBInitialDelayInKB\fR
.IP "\(bu" 4
\&\fBslices\fR \-> \fBNumSlice\fR
.IP "\(bu" 4
\&\fBrefs\fR \-> \fBNumRefFrame\fR
.IP "\(bu" 4
\&\fBb_strategy/b_frame_strategy\fR \-> \fBBRefType\fR
.IP "\(bu" 4
\&\fBcgop/CLOSED_GOP\fR codec flag \-> \fBGopOptFlag\fR
.IP "\(bu" 4
For the \fI\s-1CQP\s0\fR mode, the \fBi_qfactor/i_qoffset\fR and
\&\fBb_qfactor/b_qoffset\fR set the difference between \fI\s-1QPP\s0\fR and \fI\s-1QPI\s0\fR,
and \fI\s-1QPP\s0\fR and \fI\s-1QPB\s0\fR respectively.
.IP "\(bu" 4
Setting the \fBcoder\fR option to the value \fIvlc\fR will make the H.264
encoder use \s-1CAVLC\s0 instead of \s-1CABAC.\s0
.SS "snow"
.IX Subsection "snow"
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBiterative_dia_size\fR" 4
.IX Item "iterative_dia_size"
dia size for the iterative motion estimation
.SS "\s-1VAAPI\s0 encoders"
.IX Subsection "VAAPI encoders"
Wrappers for hardware encoders accessible via \s-1VAAPI.\s0
.PP
These encoders only accept input in \s-1VAAPI\s0 hardware surfaces.  If you have input
in software frames, use the \fBhwupload\fR filter to upload them to the \s-1GPU.\s0
.PP
The following standard libavcodec options are used:
.IP "\(bu" 4
\&\fBg\fR / \fBgop_size\fR
.IP "\(bu" 4
\&\fBbf\fR / \fBmax_b_frames\fR
.IP "\(bu" 4
\&\fBprofile\fR
.Sp
If not set, this will be determined automatically from the format of the input
frames and the profiles supported by the driver.
.IP "\(bu" 4
\&\fBlevel\fR
.IP "\(bu" 4
\&\fBb\fR / \fBbit_rate\fR
.IP "\(bu" 4
\&\fBmaxrate\fR / \fBrc_max_rate\fR
.IP "\(bu" 4
\&\fBbufsize\fR / \fBrc_buffer_size\fR
.IP "\(bu" 4
\&\fBrc_init_occupancy\fR / \fBrc_initial_buffer_occupancy\fR
.IP "\(bu" 4
\&\fBcompression_level\fR
.Sp
Speed / quality tradeoff: higher values are faster / worse quality.
.IP "\(bu" 4
\&\fBq\fR / \fBglobal_quality\fR
.Sp
Size / quality tradeoff: higher values are smaller / worse quality.
.IP "\(bu" 4
\&\fBqmin\fR
.IP "\(bu" 4
\&\fBqmax\fR
.IP "\(bu" 4
\&\fBi_qfactor\fR / \fBi_quant_factor\fR
.IP "\(bu" 4
\&\fBi_qoffset\fR / \fBi_quant_offset\fR
.IP "\(bu" 4
\&\fBb_qfactor\fR / \fBb_quant_factor\fR
.IP "\(bu" 4
\&\fBb_qoffset\fR / \fBb_quant_offset\fR
.IP "\(bu" 4
\&\fBslices\fR
.PP
All encoders support the following options:
.IP "\fBlow_power\fR" 4
.IX Item "low_power"
Some drivers/platforms offer a second encoder for some codecs intended to use
less power than the default encoder; setting this option will attempt to use
that encoder.  Note that it may support a reduced feature set, so some other
options may not be available in this mode.
.IP "\fBidr_interval\fR" 4
.IX Item "idr_interval"
Set the number of normal intra frames between full-refresh (\s-1IDR\s0) frames in
open-GOP mode.  The intra frames are still IRAPs, but will not include global
headers and may have non-decodable leading pictures.
.IP "\fBb_depth\fR" 4
.IX Item "b_depth"
Set the B\-frame reference depth.  When set to one (the default), all B\-frames
will refer only to P\- or I\-frames.  When set to greater values multiple layers
of B\-frames will be present, frames in each layer only referring to frames in
higher layers.
.IP "\fBrc_mode\fR" 4
.IX Item "rc_mode"
Set the rate control mode to use.  A given driver may only support a subset of
modes.
.Sp
Possible modes:
.RS 4
.IP "\fBauto\fR" 4
.IX Item "auto"
Choose the mode automatically based on driver support and the other options.
This is the default.
.IP "\fB\s-1CQP\s0\fR" 4
.IX Item "CQP"
Constant-quality.
.IP "\fB\s-1CBR\s0\fR" 4
.IX Item "CBR"
Constant-bitrate.
.IP "\fB\s-1VBR\s0\fR" 4
.IX Item "VBR"
Variable-bitrate.
.IP "\fB\s-1ICQ\s0\fR" 4
.IX Item "ICQ"
Intelligent constant-quality.
.IP "\fB\s-1QVBR\s0\fR" 4
.IX Item "QVBR"
Quality-defined variable-bitrate.
.IP "\fB\s-1AVBR\s0\fR" 4
.IX Item "AVBR"
Average variable bitrate.
.RE
.RS 4
.RE
.PP
Each encoder also has its own specific options:
.IP "\fBh264_vaapi\fR" 4
.IX Item "h264_vaapi"
\&\fBprofile\fR sets the value of \fIprofile_idc\fR and the \fIconstraint_set*_flag\fRs.
\&\fBlevel\fR sets the value of \fIlevel_idc\fR.
.RS 4
.IP "\fBcoder\fR" 4
.IX Item "coder"
Set entropy encoder (default is \fIcabac\fR).  Possible values:
.RS 4
.IP "\fBac\fR" 4
.IX Item "ac"
.PD 0
.IP "\fBcabac\fR" 4
.IX Item "cabac"
.PD
Use \s-1CABAC.\s0
.IP "\fBvlc\fR" 4
.IX Item "vlc"
.PD 0
.IP "\fBcavlc\fR" 4
.IX Item "cavlc"
.PD
Use \s-1CAVLC.\s0
.RE
.RS 4
.RE
.IP "\fBaud\fR" 4
.IX Item "aud"
Include access unit delimiters in the stream (not included by default).
.IP "\fBsei\fR" 4
.IX Item "sei"
Set \s-1SEI\s0 message types to include.
Some combination of the following values:
.RS 4
.IP "\fBidentifier\fR" 4
.IX Item "identifier"
Include a \fIuser_data_unregistered\fR message containing information about
the encoder.
.IP "\fBtiming\fR" 4
.IX Item "timing"
Include picture timing parameters (\fIbuffering_period\fR and
\&\fIpic_timing\fR messages).
.IP "\fBrecovery_point\fR" 4
.IX Item "recovery_point"
Include recovery points where appropriate (\fIrecovery_point\fR messages).
.RE
.RS 4
.RE
.RE
.RS 4
.RE
.IP "\fBhevc_vaapi\fR" 4
.IX Item "hevc_vaapi"
\&\fBprofile\fR and \fBlevel\fR set the values of
\&\fIgeneral_profile_idc\fR and \fIgeneral_level_idc\fR respectively.
.RS 4
.IP "\fBaud\fR" 4
.IX Item "aud"
Include access unit delimiters in the stream (not included by default).
.IP "\fBtier\fR" 4
.IX Item "tier"
Set \fIgeneral_tier_flag\fR.  This may affect the level chosen for the stream
if it is not explicitly specified.
.IP "\fBsei\fR" 4
.IX Item "sei"
Set \s-1SEI\s0 message types to include.
Some combination of the following values:
.RS 4
.IP "\fBhdr\fR" 4
.IX Item "hdr"
Include \s-1HDR\s0 metadata if the input frames have it
(\fImastering_display_colour_volume\fR and \fIcontent_light_level\fR
messages).
.RE
.RS 4
.RE
.IP "\fBtiles\fR" 4
.IX Item "tiles"
Set the number of tiles to encode the input video with, as columns x rows.
Larger numbers allow greater parallelism in both encoding and decoding, but
may decrease coding efficiency.
.RE
.RS 4
.RE
.IP "\fBmjpeg_vaapi\fR" 4
.IX Item "mjpeg_vaapi"
Only baseline \s-1DCT\s0 encoding is supported.  The encoder always uses the standard
quantisation and huffman tables \- \fBglobal_quality\fR scales the standard
quantisation table (range 1\-100).
.Sp
For \s-1YUV, 4:2:0, 4:2:2\s0 and 4:4:4 subsampling modes are supported.  \s-1RGB\s0 is also
supported, and will create an \s-1RGB JPEG.\s0
.RS 4
.IP "\fBjfif\fR" 4
.IX Item "jfif"
Include \s-1JFIF\s0 header in each frame (not included by default).
.IP "\fBhuffman\fR" 4
.IX Item "huffman"
Include standard huffman tables (on by default).  Turning this off will save
a few hundred bytes in each output frame, but may lose compatibility with some
\&\s-1JPEG\s0 decoders which don't fully handle \s-1MJPEG.\s0
.RE
.RS 4
.RE
.IP "\fBmpeg2_vaapi\fR" 4
.IX Item "mpeg2_vaapi"
\&\fBprofile\fR and \fBlevel\fR set the value of \fIprofile_and_level_indication\fR.
.IP "\fBvp8_vaapi\fR" 4
.IX Item "vp8_vaapi"
B\-frames are not supported.
.Sp
\&\fBglobal_quality\fR sets the \fIq_idx\fR used for non-key frames (range 0\-127).
.RS 4
.IP "\fBloop_filter_level\fR" 4
.IX Item "loop_filter_level"
.PD 0
.IP "\fBloop_filter_sharpness\fR" 4
.IX Item "loop_filter_sharpness"
.PD
Manually set the loop filter parameters.
.RE
.RS 4
.RE
.IP "\fBvp9_vaapi\fR" 4
.IX Item "vp9_vaapi"
\&\fBglobal_quality\fR sets the \fIq_idx\fR used for P\-frames (range 0\-255).
.RS 4
.IP "\fBloop_filter_level\fR" 4
.IX Item "loop_filter_level"
.PD 0
.IP "\fBloop_filter_sharpness\fR" 4
.IX Item "loop_filter_sharpness"
.PD
Manually set the loop filter parameters.
.RE
.RS 4
.Sp
B\-frames are supported, but the output stream is always in encode order rather than display
order.  If B\-frames are enabled, it may be necessary to use the \fBvp9_raw_reorder\fR
bitstream filter to modify the output stream to display frames in the correct order.
.Sp
Only normal frames are produced \- the \fBvp9_superframe\fR bitstream filter may be
required to produce a stream usable with all decoders.
.RE
.SS "vc2"
.IX Subsection "vc2"
\&\s-1SMPTE VC\-2\s0 (previously \s-1BBC\s0 Dirac Pro). This codec was primarily aimed at
professional broadcasting but since it supports yuv420, yuv422 and yuv444 at
8 (limited range or full range), 10 or 12 bits, this makes it suitable for
other tasks which require low overhead and low compression (like screen
recording).
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBb\fR" 4
.IX Item "b"
Sets target video bitrate. Usually that's around 1:6 of the uncompressed
video bitrate (e.g. for 1920x1080 50fps yuv422p10 that's around 400Mbps). Higher
values (close to the uncompressed bitrate) turn on lossless compression mode.
.IP "\fBfield_order\fR" 4
.IX Item "field_order"
Enables field coding when set (e.g. to tt \- top field first) for interlaced
inputs. Should increase compression with interlaced content as it splits the
fields and encodes each separately.
.IP "\fBwavelet_depth\fR" 4
.IX Item "wavelet_depth"
Sets the total amount of wavelet transforms to apply, between 1 and 5 (default).
Lower values reduce compression and quality. Less capable decoders may not be
able to handle values of \fBwavelet_depth\fR over 3.
.IP "\fBwavelet_type\fR" 4
.IX Item "wavelet_type"
Sets the transform type. Currently only \fI5_3\fR (LeGall) and \fI9_7\fR
(Deslauriers-Dubuc)
are implemented, with 9_7 being the one with better compression and thus
is the default.
.IP "\fBslice_width\fR" 4
.IX Item "slice_width"
.PD 0
.IP "\fBslice_height\fR" 4
.IX Item "slice_height"
.PD
Sets the slice size for each slice. Larger values result in better compression.
For compatibility with other more limited decoders use \fBslice_width\fR of
32 and \fBslice_height\fR of 8.
.IP "\fBtolerance\fR" 4
.IX Item "tolerance"
Sets the undershoot tolerance of the rate control system in percent. This is
to prevent an expensive search from being run.
.IP "\fBqm\fR" 4
.IX Item "qm"
Sets the quantization matrix preset to use by default or when \fBwavelet_depth\fR
is set to 5
.RS 4
.IP "\-" 4
\&\fIdefault\fR
Uses the default quantization matrix from the specifications, extended with
values for the fifth level. This provides a good balance between keeping detail
and omitting artifacts.
.IP "\-" 4
\&\fIflat\fR
Use a completely zeroed out quantization matrix. This increases \s-1PSNR\s0 but might
reduce perception. Use in bogus benchmarks.
.IP "\-" 4
\&\fIcolor\fR
Reduces detail but attempts to preserve color at extremely low bitrates.
.RE
.RS 4
.RE
.SH "SUBTITLES ENCODERS"
.IX Header "SUBTITLES ENCODERS"
.SS "dvdsub"
.IX Subsection "dvdsub"
This codec encodes the bitmap subtitle format that is used in DVDs.
Typically they are stored in \s-1VOBSUB\s0 file pairs (*.idx + *.sub),
and they can also be used in Matroska files.
.PP
\fIOptions\fR
.IX Subsection "Options"
.IP "\fBpalette\fR" 4
.IX Item "palette"
Specify the global palette used by the bitmaps.
.Sp
The format for this option is a string containing 16 24\-bits hexadecimal
numbers (without 0x prefix) separated by commas, for example \f(CW\*(C`0d00ee,
ee450d, 101010, eaeaea, 0ce60b, ec14ed, ebff0b, 0d617a, 7b7b7b, d1d1d1,
7b2a0e, 0d950c, 0f007b, cf0dec, cfa80c, 7c127b\*(C'\fR.
.IP "\fBeven_rows_fix\fR" 4
.IX Item "even_rows_fix"
When set to 1, enable a work-around that makes the number of pixel rows
even in all subtitles.  This fixes a problem with some players that
cut off the bottom row if the number is odd.  The work-around just adds
a fully transparent row if needed.  The overhead is low, typically
one byte per subtitle on average.
.Sp
By default, this work-around is disabled.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBffmpeg\fR\|(1), \fBffplay\fR\|(1), \fBffprobe\fR\|(1), \fBlibavcodec\fR\|(3)
.SH "AUTHORS"
.IX Header "AUTHORS"
The FFmpeg developers.
.PP
For details about the authorship, see the Git history of the project
(https://git.ffmpeg.org/ffmpeg), e.g. by typing the command
\&\fBgit log\fR in the FFmpeg source directory, or browsing the
online repository at <\fBhttps://git.ffmpeg.org/ffmpeg\fR>.
.PP
Maintainers for the specific components are listed in the file
\&\fI\s-1MAINTAINERS\s0\fR in the source code tree.