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135 lines
4.0 KiB
135 lines
4.0 KiB
All the numerical options, if not specified otherwise, accept in input |
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a string representing a number, which may contain one of the |
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International System number postfixes, for example 'K', 'M', 'G'. |
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If 'i' is appended after the postfix, powers of 2 are used instead of |
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powers of 10. The 'B' postfix multiplies the value for 8, and can be |
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appended after another postfix or used alone. This allows using for |
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example 'KB', 'MiB', 'G' and 'B' as postfix. |
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Options which do not take arguments are boolean options, and set the |
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corresponding value to true. They can be set to false by prefixing |
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with "no" the option name, for example using "-nofoo" in the |
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commandline will set to false the boolean option with name "foo". |
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@section Generic options |
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These options are shared amongst the ff* tools. |
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@table @option |
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@item -L |
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Show license. |
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@item -h, -?, -help, --help |
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Show help. |
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@item -version |
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Show version. |
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@item -formats |
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Show available formats. |
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The fields preceding the format names have the following meanings: |
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@table @samp |
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@item D |
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Decoding available |
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@item E |
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Encoding available |
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@end table |
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@item -codecs |
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Show available codecs. |
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The fields preceding the codec names have the following meanings: |
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@table @samp |
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@item D |
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Decoding available |
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@item E |
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Encoding available |
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@item V/A/S |
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Video/audio/subtitle codec |
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@item S |
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Codec supports slices |
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@item D |
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Codec supports direct rendering |
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@item T |
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Codec can handle input truncated at random locations instead of only at frame boundaries |
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@end table |
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@item -bsfs |
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Show available bitstream filters. |
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@item -protocols |
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Show available protocols. |
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@item -filters |
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Show available libavfilter filters. |
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@item -pix_fmts |
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Show available pixel formats. |
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@item -loglevel @var{loglevel} |
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Set the logging level used by the library. |
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@var{loglevel} is a number or a string containing one of the following values: |
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@table @samp |
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@item quiet |
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@item panic |
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@item fatal |
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@item error |
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@item warning |
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@item info |
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@item verbose |
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@item debug |
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@end table |
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By default the program logs to stderr, if coloring is supported by the |
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terminal, colors are used to mark errors and warnings. Log coloring |
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can be disabled setting the environment variable |
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@env{FFMPEG_FORCE_NOCOLOR} or @env{NO_COLOR}, or can be forced setting |
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the environment variable @env{FFMPEG_FORCE_COLOR}. |
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The use of the environment variable @env{NO_COLOR} is deprecated and |
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will be dropped in a following FFmpeg version. |
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@end table |
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@section AVOptions |
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These options are provided directly by the libavformat, libavdevice and |
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libavcodec libraries. To see the list of available AVOptions, use the |
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@option{-help} option. They are separated into two categories: |
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@table @option |
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@item generic |
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These options can be set for any container, codec or device. Generic options are |
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listed under AVFormatContext options for containers/devices and under |
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AVCodecContext options for codecs. |
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@item private |
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These options are specific to the given container, device or codec. Private |
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options are listed under their corresponding containers/devices/codecs. |
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@end table |
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For example to write an ID3v2.3 header instead of a default ID3v2.4 to |
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an MP3 file, use the @option{id3v2_version} private option of the MP3 |
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muxer: |
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@example |
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ffmpeg -i input.flac -id3v2_version 3 out.mp3 |
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@end example |
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You can precisely specify which stream(s) should the codec AVOption apply to by |
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appending a stream specifier of the form |
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@option{[:@var{stream_type}][:@var{stream_index}]} to the option name. |
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@var{stream_type} is 'v' for video, 'a' for audio and 's' for subtitle streams. |
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@var{stream_index} is a global stream index when @var{stream_type} isn't |
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given, otherwise it counts streams of the given type only. As always, the index |
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is zero-based. For example |
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@example |
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-foo -- applies to all applicable streams |
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-foo:v -- applies to all video streams |
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-foo:a:2 -- applies to the third audio stream |
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-foo:0 -- applies to the first stream |
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@end example |
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Note -nooption syntax cannot be used for boolean AVOptions, use -option |
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0/-option 1. |
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Note2 old undocumented way of specifying per-stream AVOptions by prepending |
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v/a/s to the options name is now obsolete and will be removed soon.
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