Hu Chunming / FFNvDecoder

  \input texinfo @c -*- texinfo -*-
  @documentencoding UTF-8
  
  @settitle ffprobe Documentation
  @titlepage
  @center @titlefont{ffprobe Documentation}
  @end titlepage
  
  @top
  
  @contents
  
  @chapter Synopsis
  
  ffprobe [@var{options}] [@file{input_url}]
  
  @chapter Description
  @c man begin DESCRIPTION
  
  ffprobe gathers information from multimedia streams and prints it in
  human- and machine-readable fashion.
  
  For example it can be used to check the format of the container used
  by a multimedia stream and the format and type of each media stream
  contained in it.
  
  If a url is specified in input, ffprobe will try to open and
  probe the url content. If the url cannot be opened or recognized as
  a multimedia file, a positive exit code is returned.
  
  ffprobe may be employed both as a standalone application or in
  combination with a textual filter, which may perform more
  sophisticated processing, e.g. statistical processing or plotting.
  
  Options are used to list some of the formats supported by ffprobe or
  for specifying which information to display, and for setting how
  ffprobe will show it.
  
  ffprobe output is designed to be easily parsable by a textual filter,
  and consists of one or more sections of a form defined by the selected
  writer, which is specified by the @option{print_format} option.
  
  Sections may contain other nested sections, and are identified by a
  name (which may be shared by other sections), and an unique
  name. See the output of @option{sections}.
  
  Metadata tags stored in the container or in the streams are recognized
  and printed in the corresponding "FORMAT", "STREAM" or "PROGRAM_STREAM"
  section.
  
  @c man end
  
  @chapter Options
  @c man begin OPTIONS
  
  @include fftools-common-opts.texi
  
  @section Main options
  
  @table @option
  
  @item -f @var{format}
  Force format to use.
  
  @item -unit
  Show the unit of the displayed values.
  
  @item -prefix
  Use SI prefixes for the displayed values.
  Unless the "-byte_binary_prefix" option is used all the prefixes
  are decimal.
  
  @item -byte_binary_prefix
  Force the use of binary prefixes for byte values.
  
  @item -sexagesimal
  Use sexagesimal format HH:MM:SS.MICROSECONDS for time values.
  
  @item -pretty
  Prettify the format of the displayed values, it corresponds to the
  options "-unit -prefix -byte_binary_prefix -sexagesimal".
  
  @item -of, -print_format @var{writer_name}[=@var{writer_options}]
  Set the output printing format.
  
  @var{writer_name} specifies the name of the writer, and
  @var{writer_options} specifies the options to be passed to the writer.
  
  For example for printing the output in JSON format, specify:
  @example
  -print_format json
  @end example
  
  For more details on the available output printing formats, see the
  Writers section below.
  
  @item -sections
  Print sections structure and section information, and exit. The output
  is not meant to be parsed by a machine.
  
  @item -select_streams @var{stream_specifier}
  Select only the streams specified by @var{stream_specifier}. This
  option affects only the options related to streams
  (e.g. @code{show_streams}, @code{show_packets}, etc.).
  
  For example to show only audio streams, you can use the command:
  @example
  ffprobe -show_streams -select_streams a INPUT
  @end example
  
  To show only video packets belonging to the video stream with index 1:
  @example
  ffprobe -show_packets -select_streams v:1 INPUT
  @end example
  
  @item -show_data
  Show payload data, as a hexadecimal and ASCII dump. Coupled with
  @option{-show_packets}, it will dump the packets' data. Coupled with
  @option{-show_streams}, it will dump the codec extradata.
  
  The dump is printed as the "data" field. It may contain newlines.
  
  @item -show_data_hash @var{algorithm}
  Show a hash of payload data, for packets with @option{-show_packets} and for
  codec extradata with @option{-show_streams}.
  
  @item -show_error
  Show information about the error found when trying to probe the input.
  
  The error information is printed within a section with name "ERROR".
  
  @item -show_format
  Show information about the container format of the input multimedia
  stream.
  
  All the container format information is printed within a section with
  name "FORMAT".
  
  @item -show_format_entry @var{name}
  Like @option{-show_format}, but only prints the specified entry of the
  container format information, rather than all. This option may be given more
  than once, then all specified entries will be shown.
  
  This option is deprecated, use @code{show_entries} instead.
  
  @item -show_entries @var{section_entries}
  Set list of entries to show.
  
  Entries are specified according to the following
  syntax. @var{section_entries} contains a list of section entries
  separated by @code{:}. Each section entry is composed by a section
  name (or unique name), optionally followed by a list of entries local
  to that section, separated by @code{,}.
  
  If section name is specified but is followed by no @code{=}, all
  entries are printed to output, together with all the contained
  sections. Otherwise only the entries specified in the local section
  entries list are printed. In particular, if @code{=} is specified but
  the list of local entries is empty, then no entries will be shown for
  that section.
  
  Note that the order of specification of the local section entries is
  not honored in the output, and the usual display order will be
  retained.
  
  The formal syntax is given by:
  @example
  @var{LOCAL_SECTION_ENTRIES} ::= @var{SECTION_ENTRY_NAME}[,@var{LOCAL_SECTION_ENTRIES}]
  @var{SECTION_ENTRY}         ::= @var{SECTION_NAME}[=[@var{LOCAL_SECTION_ENTRIES}]]
  @var{SECTION_ENTRIES}       ::= @var{SECTION_ENTRY}[:@var{SECTION_ENTRIES}]
  @end example
  
  For example, to show only the index and type of each stream, and the PTS
  time, duration time, and stream index of the packets, you can specify
  the argument:
  @example
  packet=pts_time,duration_time,stream_index : stream=index,codec_type
  @end example
  
  To show all the entries in the section "format", but only the codec
  type in the section "stream", specify the argument:
  @example
  format : stream=codec_type
  @end example
  
  To show all the tags in the stream and format sections:
  @example
  stream_tags : format_tags
  @end example
  
  To show only the @code{title} tag (if available) in the stream
  sections:
  @example
  stream_tags=title
  @end example
  
  @item -show_packets
  Show information about each packet contained in the input multimedia
  stream.
  
  The information for each single packet is printed within a dedicated
  section with name "PACKET".
  
  @item -show_frames
  Show information about each frame and subtitle contained in the input
  multimedia stream.
  
  The information for each single frame is printed within a dedicated
  section with name "FRAME" or "SUBTITLE".
  
  @item -show_log @var{loglevel}
  Show logging information from the decoder about each frame according to
  the value set in @var{loglevel}, (see @code{-loglevel}). This option requires @code{-show_frames}.
  
  The information for each log message is printed within a dedicated
  section with name "LOG".
  
  @item -show_streams
  Show information about each media stream contained in the input
  multimedia stream.
  
  Each media stream information is printed within a dedicated section
  with name "STREAM".
  
  @item -show_programs
  Show information about programs and their streams contained in the input
  multimedia stream.
  
  Each media stream information is printed within a dedicated section
  with name "PROGRAM_STREAM".
  
  @item -show_chapters
  Show information about chapters stored in the format.
  
  Each chapter is printed within a dedicated section with name "CHAPTER".
  
  @item -count_frames
  Count the number of frames per stream and report it in the
  corresponding stream section.
  
  @item -count_packets
  Count the number of packets per stream and report it in the
  corresponding stream section.
  
  @item -read_intervals @var{read_intervals}
  
  Read only the specified intervals. @var{read_intervals} must be a
  sequence of interval specifications separated by ",".
  @command{ffprobe} will seek to the interval starting point, and will
  continue reading from that.
  
  Each interval is specified by two optional parts, separated by "%".
  
  The first part specifies the interval start position. It is
  interpreted as an absolute position, or as a relative offset from the
  current position if it is preceded by the "+" character. If this first
  part is not specified, no seeking will be performed when reading this
  interval.
  
  The second part specifies the interval end position. It is interpreted
  as an absolute position, or as a relative offset from the current
  position if it is preceded by the "+" character. If the offset
  specification starts with "#", it is interpreted as the number of
  packets to read (not including the flushing packets) from the interval
  start. If no second part is specified, the program will read until the
  end of the input.
  
  Note that seeking is not accurate, thus the actual interval start
  point may be different from the specified position. Also, when an
  interval duration is specified, the absolute end time will be computed
  by adding the duration to the interval start point found by seeking
  the file, rather than to the specified start value.
  
  The formal syntax is given by:
  @example
  @var{INTERVAL}  ::= [@var{START}|+@var{START_OFFSET}][%[@var{END}|+@var{END_OFFSET}]]
  @var{INTERVALS} ::= @var{INTERVAL}[,@var{INTERVALS}]
  @end example
  
  A few examples follow.
  @itemize
  @item
  Seek to time 10, read packets until 20 seconds after the found seek
  point, then seek to position @code{01:30} (1 minute and thirty
  seconds) and read packets until position @code{01:45}.
  @example
  10%+20,01:30%01:45
  @end example
  
  @item
  Read only 42 packets after seeking to position @code{01:23}:
  @example
  01:23%+#42
  @end example
  
  @item
  Read only the first 20 seconds from the start:
  @example
  %+20
  @end example
  
  @item
  Read from the start until position @code{02:30}:
  @example
  %02:30
  @end example
  @end itemize
  
  @item -show_private_data, -private
  Show private data, that is data depending on the format of the
  particular shown element.
  This option is enabled by default, but you may need to disable it
  for specific uses, for example when creating XSD-compliant XML output.
  
  @item -show_program_version
  Show information related to program version.
  
  Version information is printed within a section with name
  "PROGRAM_VERSION".
  
  @item -show_library_versions
  Show information related to library versions.
  
  Version information for each library is printed within a section with
  name "LIBRARY_VERSION".
  
  @item -show_versions
  Show information related to program and library versions. This is the
  equivalent of setting both @option{-show_program_version} and
  @option{-show_library_versions} options.
  
  @item -show_pixel_formats
  Show information about all pixel formats supported by FFmpeg.
  
  Pixel format information for each format is printed within a section
  with name "PIXEL_FORMAT".
  
  @item -bitexact
  Force bitexact output, useful to produce output which is not dependent
  on the specific build.
  
  @item -i @var{input_url}
  Read @var{input_url}.
  
  @end table
  @c man end
  
  @chapter Writers
  @c man begin WRITERS
  
  A writer defines the output format adopted by @command{ffprobe}, and will be
  used for printing all the parts of the output.
  
  A writer may accept one or more arguments, which specify the options
  to adopt. The options are specified as a list of @var{key}=@var{value}
  pairs, separated by ":".
  
  All writers support the following options:
  
  @table @option
  @item string_validation, sv
  Set string validation mode.
  
  The following values are accepted.
  @table @samp
  @item fail
  The writer will fail immediately in case an invalid string (UTF-8)
  sequence or code point is found in the input. This is especially
  useful to validate input metadata.
  
  @item ignore
  Any validation error will be ignored. This will result in possibly
  broken output, especially with the json or xml writer.
  
  @item replace
  The writer will substitute invalid UTF-8 sequences or code points with
  the string specified with the @option{string_validation_replacement}.
  @end table
  
  Default value is @samp{replace}.
  
  @item string_validation_replacement, svr
  Set replacement string to use in case @option{string_validation} is
  set to @samp{replace}.
  
  In case the option is not specified, the writer will assume the empty
  string, that is it will remove the invalid sequences from the input
  strings.
  @end table
  
  A description of the currently available writers follows.
  
  @section default
  Default format.
  
  Print each section in the form:
  @example
  [SECTION]
  key1=val1
  ...
  keyN=valN
  [/SECTION]
  @end example
  
  Metadata tags are printed as a line in the corresponding FORMAT, STREAM or
  PROGRAM_STREAM section, and are prefixed by the string "TAG:".
  
  A description of the accepted options follows.
  
  @table @option
  
  @item nokey, nk
  If set to 1 specify not to print the key of each field. Default value
  is 0.
  
  @item noprint_wrappers, nw
  If set to 1 specify not to print the section header and footer.
  Default value is 0.
  @end table
  
  @section compact, csv
  Compact and CSV format.
  
  The @code{csv} writer is equivalent to @code{compact}, but supports
  different defaults.
  
  Each section is printed on a single line.
  If no option is specified, the output has the form:
  @example
  section|key1=val1| ... |keyN=valN
  @end example
  
  Metadata tags are printed in the corresponding "format" or "stream"
  section. A metadata tag key, if printed, is prefixed by the string
  "tag:".
  
  The description of the accepted options follows.
  
  @table @option
  
  @item item_sep, s
  Specify the character to use for separating fields in the output line.
  It must be a single printable character, it is "|" by default ("," for
  the @code{csv} writer).
  
  @item nokey, nk
  If set to 1 specify not to print the key of each field. Its default
  value is 0 (1 for the @code{csv} writer).
  
  @item escape, e
  Set the escape mode to use, default to "c" ("csv" for the @code{csv}
  writer).
  
  It can assume one of the following values:
  @table @option
  @item c
  Perform C-like escaping. Strings containing a newline (@samp{\n}), carriage
  return (@samp{\r}), a tab (@samp{\t}), a form feed (@samp{\f}), the escaping
  character (@samp{\}) or the item separator character @var{SEP} are escaped
  using C-like fashioned escaping, so that a newline is converted to the
  sequence @samp{\n}, a carriage return to @samp{\r}, @samp{\} to @samp{\\} and
  the separator @var{SEP} is converted to @samp{\@var{SEP}}.
  
  @item csv
  Perform CSV-like escaping, as described in RFC4180.  Strings
  containing a newline (@samp{\n}), a carriage return (@samp{\r}), a double quote
  (@samp{"}), or @var{SEP} are enclosed in double-quotes.
  
  @item none
  Perform no escaping.
  @end table
  
  @item print_section, p
  Print the section name at the beginning of each line if the value is
  @code{1}, disable it with value set to @code{0}. Default value is
  @code{1}.
  
  @end table
  
  @section flat
  Flat format.
  
  A free-form output where each line contains an explicit key=value, such as
  "streams.stream.3.tags.foo=bar". The output is shell escaped, so it can be
  directly embedded in sh scripts as long as the separator character is an
  alphanumeric character or an underscore (see @var{sep_char} option).
  
  The description of the accepted options follows.
  
  @table @option
  @item sep_char, s
  Separator character used to separate the chapter, the section name, IDs and
  potential tags in the printed field key.
  
  Default value is @samp{.}.
  
  @item hierarchical, h
  Specify if the section name specification should be hierarchical. If
  set to 1, and if there is more than one section in the current
  chapter, the section name will be prefixed by the name of the
  chapter. A value of 0 will disable this behavior.
  
  Default value is 1.
  @end table
  
  @section ini
  INI format output.
  
  Print output in an INI based format.
  
  The following conventions are adopted:
  
  @itemize
  @item
  all key and values are UTF-8
  @item
  @samp{.} is the subgroup separator
  @item
  newline, @samp{\t}, @samp{\f}, @samp{\b} and the following characters are
  escaped
  @item
  @samp{\} is the escape character
  @item
  @samp{#} is the comment indicator
  @item
  @samp{=} is the key/value separator
  @item
  @samp{:} is not used but usually parsed as key/value separator
  @end itemize
  
  This writer accepts options as a list of @var{key}=@var{value} pairs,
  separated by @samp{:}.
  
  The description of the accepted options follows.
  
  @table @option
  @item hierarchical, h
  Specify if the section name specification should be hierarchical. If
  set to 1, and if there is more than one section in the current
  chapter, the section name will be prefixed by the name of the
  chapter. A value of 0 will disable this behavior.
  
  Default value is 1.
  @end table
  
  @section json
  JSON based format.
  
  Each section is printed using JSON notation.
  
  The description of the accepted options follows.
  
  @table @option
  
  @item compact, c
  If set to 1 enable compact output, that is each section will be
  printed on a single line. Default value is 0.
  @end table
  
  For more information about JSON, see @url{http://www.json.org/}.
  
  @section xml
  XML based format.
  
  The XML output is described in the XML schema description file
  @file{ffprobe.xsd} installed in the FFmpeg datadir.
  
  An updated version of the schema can be retrieved at the url
  @url{http://www.ffmpeg.org/schema/ffprobe.xsd}, which redirects to the
  latest schema committed into the FFmpeg development source code tree.
  
  Note that the output issued will be compliant to the
  @file{ffprobe.xsd} schema only when no special global output options
  (@option{unit}, @option{prefix}, @option{byte_binary_prefix},
  @option{sexagesimal} etc.) are specified.
  
  The description of the accepted options follows.
  
  @table @option
  
  @item fully_qualified, q
  If set to 1 specify if the output should be fully qualified. Default
  value is 0.
  This is required for generating an XML file which can be validated
  through an XSD file.
  
  @item xsd_strict, x
  If set to 1 perform more checks for ensuring that the output is XSD
  compliant. Default value is 0.
  This option automatically sets @option{fully_qualified} to 1.
  @end table
  
  For more information about the XML format, see
  @url{https://www.w3.org/XML/}.
  @c man end WRITERS
  
  @chapter Timecode
  @c man begin TIMECODE
  
  @command{ffprobe} supports Timecode extraction:
  
  @itemize
  
  @item
  MPEG1/2 timecode is extracted from the GOP, and is available in the video
  stream details (@option{-show_streams}, see @var{timecode}).
  
  @item
  MOV timecode is extracted from tmcd track, so is available in the tmcd
  stream metadata (@option{-show_streams}, see @var{TAG:timecode}).
  
  @item
  DV, GXF and AVI timecodes are available in format metadata
  (@option{-show_format}, see @var{TAG:timecode}).
  
  @end itemize
  @c man end TIMECODE
  
  @include config.texi
  @ifset config-all
  @set config-readonly
  @ifset config-avutil
  @include utils.texi
  @end ifset
  @ifset config-avcodec
  @include codecs.texi
  @include bitstream_filters.texi
  @end ifset
  @ifset config-avformat
  @include formats.texi
  @include protocols.texi
  @end ifset
  @ifset config-avdevice
  @include devices.texi
  @end ifset
  @ifset config-swresample
  @include resampler.texi
  @end ifset
  @ifset config-swscale
  @include scaler.texi
  @end ifset
  @ifset config-avfilter
  @include filters.texi
  @end ifset
  @end ifset
  
  @chapter See Also
  
  @ifhtml
  @ifset config-all
  @url{ffprobe.html,ffprobe},
  @end ifset
  @ifset config-not-all
  @url{ffprobe-all.html,ffprobe-all},
  @end ifset
  @url{ffmpeg.html,ffmpeg}, @url{ffplay.html,ffplay},
  @url{ffmpeg-utils.html,ffmpeg-utils},
  @url{ffmpeg-scaler.html,ffmpeg-scaler},
  @url{ffmpeg-resampler.html,ffmpeg-resampler},
  @url{ffmpeg-codecs.html,ffmpeg-codecs},
  @url{ffmpeg-bitstream-filters.html,ffmpeg-bitstream-filters},
  @url{ffmpeg-formats.html,ffmpeg-formats},
  @url{ffmpeg-devices.html,ffmpeg-devices},
  @url{ffmpeg-protocols.html,ffmpeg-protocols},
  @url{ffmpeg-filters.html,ffmpeg-filters}
  @end ifhtml
  
  @ifnothtml
  @ifset config-all
  ffprobe(1),
  @end ifset
  @ifset config-not-all
  ffprobe-all(1),
  @end ifset
  ffmpeg(1), ffplay(1),
  ffmpeg-utils(1), ffmpeg-scaler(1), ffmpeg-resampler(1),
  ffmpeg-codecs(1), ffmpeg-bitstream-filters(1), ffmpeg-formats(1),
  ffmpeg-devices(1), ffmpeg-protocols(1), ffmpeg-filters(1)
  @end ifnothtml
  
  @include authors.texi
  
  @ignore
  
  @setfilename ffprobe
  @settitle ffprobe media prober
  
  @end ignore
  
  @bye