388 lines
13 KiB
Text
Executable file
388 lines
13 KiB
Text
Executable file
All the numerical options, if not specified otherwise, accept a string
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representing a number as input, which may be followed by one of the SI
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unit prefixes, for example: 'K', 'M', or 'G'.
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If 'i' is appended to the SI unit prefix, the complete prefix will be
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interpreted as a unit prefix for binary multiples, which are based on
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powers of 1024 instead of powers of 1000. Appending 'B' to the SI unit
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prefix multiplies the value by 8. This allows using, for example:
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'KB', 'MiB', 'G' and 'B' as number suffixes.
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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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the option name with "no". For example using "-nofoo"
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will set the boolean option with name "foo" to false.
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@anchor{Stream specifiers}
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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) a given option belongs 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} contains the
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@code{a:1} stream specifier, 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 streams, so that the option is 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. If @var{stream_index} is used as an
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additional stream specifier (see below), then it selects stream number
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@var{stream_index} from the matching streams. Stream numbering is based on the
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order of the streams as detected by libavformat except when a program ID is
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also specified. In this case it is based on the ordering of the streams in the
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program.
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@item @var{stream_type}[:@var{additional_stream_specifier}]
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@var{stream_type} is one of following: 'v' or 'V' for video, 'a' for audio, 's'
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for subtitle, 'd' for data, and 't' for attachments. 'v' matches all video
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streams, 'V' only matches video streams which are not attached pictures, video
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thumbnails or cover arts. If @var{additional_stream_specifier} is used, then
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it matches streams which both have this type and match the
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@var{additional_stream_specifier}. Otherwise, it matches all streams of the
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specified type.
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@item p:@var{program_id}[:@var{additional_stream_specifier}]
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Matches streams which are in the program with the id @var{program_id}. If
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@var{additional_stream_specifier} is used, then it matches streams which both
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are part of the program and match the @var{additional_stream_specifier}.
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@item #@var{stream_id} or i:@var{stream_id}
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Match the stream by stream id (e.g. PID in MPEG-TS container).
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@item m:@var{key}[:@var{value}]
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Matches streams with the metadata tag @var{key} having the specified value. If
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@var{value} is not given, matches streams that contain the given tag with any
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value.
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@item u
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Matches streams with usable configuration, the codec must be defined and the
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essential information such as video dimension or audio sample rate must be present.
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Note that in @command{ffmpeg}, matching by metadata will only work properly for
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input files.
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@end table
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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 [@var{arg}]
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Show help. An optional parameter may be specified to print help about a specific
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item. If no argument is specified, only basic (non advanced) tool
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options are shown.
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Possible values of @var{arg} are:
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@table @option
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@item long
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Print advanced tool options in addition to the basic tool options.
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@item full
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Print complete list of options, including shared and private options
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for encoders, decoders, demuxers, muxers, filters, etc.
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@item decoder=@var{decoder_name}
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Print detailed information about the decoder named @var{decoder_name}. Use the
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@option{-decoders} option to get a list of all decoders.
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@item encoder=@var{encoder_name}
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Print detailed information about the encoder named @var{encoder_name}. Use the
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@option{-encoders} option to get a list of all encoders.
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@item demuxer=@var{demuxer_name}
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Print detailed information about the demuxer named @var{demuxer_name}. Use the
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@option{-formats} option to get a list of all demuxers and muxers.
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@item muxer=@var{muxer_name}
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Print detailed information about the muxer named @var{muxer_name}. Use the
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@option{-formats} option to get a list of all muxers and demuxers.
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@item filter=@var{filter_name}
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Print detailed information about the filter name @var{filter_name}. Use the
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@option{-filters} option to get a list of all filters.
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@item bsf=@var{bitstream_filter_name}
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Print detailed information about the bitstream filter name @var{bitstream_filter_name}.
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Use the @option{-bsfs} option to get a list of all bitstream filters.
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@end table
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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 (including devices).
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@item -demuxers
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Show available demuxers.
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@item -muxers
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Show available muxers.
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@item -devices
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Show available devices.
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@item -codecs
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Show all codecs known to libavcodec.
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Note that the term 'codec' is used throughout this documentation as a shortcut
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for what is more correctly called a media bitstream format.
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@item -decoders
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Show available decoders.
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@item -encoders
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Show all available encoders.
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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 -layouts
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Show channel names and standard channel layouts.
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@item -colors
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Show recognized color names.
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@item -sources @var{device}[,@var{opt1}=@var{val1}[,@var{opt2}=@var{val2}]...]
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Show autodetected sources of the input device.
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Some devices may provide system-dependent source names that cannot be autodetected.
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The returned list cannot be assumed to be always complete.
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@example
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ffmpeg -sources pulse,server=192.168.0.4
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@end example
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@item -sinks @var{device}[,@var{opt1}=@var{val1}[,@var{opt2}=@var{val2}]...]
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Show autodetected sinks of the output device.
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Some devices may provide system-dependent sink names that cannot be autodetected.
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The returned list cannot be assumed to be always complete.
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@example
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ffmpeg -sinks pulse,server=192.168.0.4
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@end example
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@item -loglevel [@var{flags}+]@var{loglevel} | -v [@var{flags}+]@var{loglevel}
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Set logging level and flags used by the library.
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The optional @var{flags} prefix can consist of the following values:
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@table @samp
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@item repeat
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Indicates that repeated log output should not be compressed to the first line
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and the "Last message repeated n times" line will be omitted.
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@item level
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Indicates that log output should add a @code{[level]} prefix to each message
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line. This can be used as an alternative to log coloring, e.g. when dumping the
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log to file.
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@end table
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Flags can also be used alone by adding a '+'/'-' prefix to set/reset a single
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flag without affecting other @var{flags} or changing @var{loglevel}. When
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setting both @var{flags} and @var{loglevel}, a '+' separator is expected
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between the last @var{flags} value and before @var{loglevel}.
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@var{loglevel} is a string or a number containing one of the following values:
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@table @samp
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@item quiet, -8
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Show nothing at all; be silent.
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@item panic, 0
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Only show fatal errors which could lead the process to crash, such as
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an assertion failure. This is not currently used for anything.
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@item fatal, 8
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Only show fatal errors. These are errors after which the process absolutely
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cannot continue.
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@item error, 16
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Show all errors, including ones which can be recovered from.
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@item warning, 24
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Show all warnings and errors. Any message related to possibly
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incorrect or unexpected events will be shown.
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@item info, 32
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Show informative messages during processing. This is in addition to
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warnings and errors. This is the default value.
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@item verbose, 40
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Same as @code{info}, except more verbose.
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@item debug, 48
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Show everything, including debugging information.
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@item trace, 56
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@end table
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For example to enable repeated log output, add the @code{level} prefix, and set
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@var{loglevel} to @code{verbose}:
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@example
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ffmpeg -loglevel repeat+level+verbose -i input output
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@end example
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Another example that enables repeated log output without affecting current
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state of @code{level} prefix flag or @var{loglevel}:
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@example
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ffmpeg [...] -loglevel +repeat
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@end example
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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{AV_LOG_FORCE_NOCOLOR}, or can be forced setting
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the environment variable @env{AV_LOG_FORCE_COLOR}.
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@item -report
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Dump full command line and log output to a file named
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@code{@var{program}-@var{YYYYMMDD}-@var{HHMMSS}.log} in the current
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directory.
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This file can be useful for bug reports.
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It also implies @code{-loglevel debug}.
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Setting the environment variable @env{FFREPORT} to any value has the
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same effect. If the value is a ':'-separated key=value sequence, these
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options will affect the report; option values must be escaped if they
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contain special characters or the options delimiter ':' (see the
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``Quoting and escaping'' section in the ffmpeg-utils manual).
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The following options are recognized:
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@table @option
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@item file
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set the file name to use for the report; @code{%p} is expanded to the name
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of the program, @code{%t} is expanded to a timestamp, @code{%%} is expanded
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to a plain @code{%}
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@item level
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set the log verbosity level using a numerical value (see @code{-loglevel}).
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@end table
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For example, to output a report to a file named @file{ffreport.log}
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using a log level of @code{32} (alias for log level @code{info}):
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@example
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FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output
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@end example
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Errors in parsing the environment variable are not fatal, and will not
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appear in the report.
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@item -hide_banner
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Suppress printing banner.
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All FFmpeg tools will normally show a copyright notice, build options
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and library versions. This option can be used to suppress printing
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this information.
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@item -cpuflags flags (@emph{global})
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Allows setting and clearing cpu flags. This option is intended
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for testing. Do not use it unless you know what you're doing.
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@example
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ffmpeg -cpuflags -sse+mmx ...
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ffmpeg -cpuflags mmx ...
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ffmpeg -cpuflags 0 ...
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@end example
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Possible flags for this option are:
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@table @samp
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@item x86
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@table @samp
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@item mmx
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@item mmxext
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@item sse
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@item sse2
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@item sse2slow
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@item sse3
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@item sse3slow
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@item ssse3
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@item atom
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@item sse4.1
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@item sse4.2
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@item avx
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@item avx2
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@item xop
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@item fma3
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@item fma4
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@item 3dnow
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@item 3dnowext
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@item bmi1
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@item bmi2
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@item cmov
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@end table
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@item ARM
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@table @samp
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@item armv5te
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@item armv6
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@item armv6t2
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@item vfp
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@item vfpv3
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@item neon
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@item setend
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@end table
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@item AArch64
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@table @samp
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@item armv8
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@item vfp
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@item neon
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@end table
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@item PowerPC
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@table @samp
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@item altivec
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@end table
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@item Specific Processors
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@table @samp
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@item pentium2
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@item pentium3
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@item pentium4
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@item k6
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@item k62
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@item athlon
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@item athlonxp
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@item k8
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@end table
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@end table
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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
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are 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 per-stream, and thus a stream specifier
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should be attached to them:
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@example
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ffmpeg -i multichannel.mxf -map 0:v:0 -map 0:a:0 -map 0:a:0 -c:a:0 ac3 -b:a:0 640k -ac:a:1 2 -c:a:1 aac -b:2 128k out.mp4
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@end example
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In the above example, a multichannel audio stream is mapped twice for output.
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The first instance is encoded with codec ac3 and bitrate 640k.
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The second instance is downmixed to 2 channels and encoded with codec aac. A bitrate of 128k is specified for it using
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absolute index of the output stream.
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Note: the @option{-nooption} syntax cannot be used for boolean
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AVOptions, use @option{-option 0}/@option{-option 1}.
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Note: the old undocumented way of specifying per-stream AVOptions by
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prepending v/a/s to the options name is now obsolete and will be
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removed soon.
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