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5.0 KiB
157 lines
5.0 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 Stream specifiers |
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Some options are applied per-stream, e.g. bitrate or codec. Stream specifiers |
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are used to precisely specify which stream(s) does a given option belong to. |
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A stream specifier is a string generally appended to the option name and |
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separated from it by a colon. E.g. @code{-codec:a:1 ac3} option contains |
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@code{a:1} stream specifer, which matches the second audio stream. Therefore it |
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would select the ac3 codec for the second audio stream. |
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A stream specifier can match several stream, the option is then applied to all |
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of them. E.g. the stream specifier in @code{-b:a 128k} matches all audio |
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streams. |
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An empty stream specifier matches all streams, for example @code{-codec copy} |
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or @code{-codec: copy} would copy all the streams without reencoding. |
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Possible forms of stream specifiers are: |
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@table @option |
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@item @var{stream_index} |
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Matches the stream with this index. E.g. @code{-threads:1 4} would set the |
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thread count for the second stream to 4. |
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@item @var{stream_type}[:@var{stream_index}] |
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@var{stream_type} is one of: 'v' for video, 'a' for audio, 's' for subtitle, |
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'd' for data and 't' for attachments. If @var{stream_index} is given, then |
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matches stream number @var{stream_index} of this type. Otherwise matches all |
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streams of this type. |
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@item p:@var{program_id}[:@var{stream_index}] |
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If @var{stream_index} is given, then matches stream number @var{stream_index} in |
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program with id @var{program_id}. Otherwise matches all streams in this program. |
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@end table |
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@section Generic options |
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These options are shared amongst the av* 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 -sample_fmts |
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Show available sample formats. |
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@item -loglevel @var{loglevel} | -v @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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All codec AVOptions are obviously per-stream, so the chapter on stream |
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specifiers applies to them |
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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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