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vcodec=libvpx g=120 lag-in-frames=16 deadline=good cpu-used=0 vprofile=0 qmax=63 qmin=0 b=768k #ignored unless using -pass 2 maxrate=1.5M minrate=40k auto-alt-ref=1 arnr-maxframes=7 arnr-strength=5 arnr-type=centered
功能基本完成，接口待打磨