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Currently when specifying the program id you can only decide to select all stream of the specified program (e.g. p:103 will select all streams of program 103) or narrow the selection to a specific stream sub index (e.g. p:145:1 will select 2nd stream of program 145.) But you can not specify like all audio streams of program 145 or 3rd video stream of program 311. In some case, mainly working with multiprogram mpeg-ts containers as input, this feature would be handy. This patch makes it possible to narrow the stream selection among streams of the specified program by stream type and optionally its index. Handled types: a, v, s, d. Examples: p:601:a will select all audio streams of program 601, p:603:a:1 will select 2nd audio streams of program 603, p:604:v:0 will select first video stream of program 604. Signed-off-by: Bela Bodecs <bodecsb@vivanet.hu> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
376 lines
12 KiB
Plaintext
376 lines
12 KiB
Plaintext
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.
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@item @var{stream_type}[:@var{stream_index}]
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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{stream_index} is given, then it matches
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stream number @var{stream_index} of this type. Otherwise, it matches all
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streams of this type.
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@item p:@var{program_id}[:@var{stream_index}] or p:@var{program_id}[:@var{stream_type}[:@var{stream_index}]]
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In first version, if @var{stream_index} is given, then it matches the stream with number @var{stream_index}
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in the program with the id @var{program_id}. Otherwise, it matches all streams in the
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program. In the latter version, @var{stream_type} is one of following: 'v' for video, 'a' for audio, 's'
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for subtitle, 'd' for data. If @var{stream_index} is also given, then it matches
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stream number @var{stream_index} of this type in the program with the id @var{program_id}.
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Otherwise, if only @var{stream_type} is given, it matches all
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streams of this type in the program with the id @var{program_id}.
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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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@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 @env{NO_COLOR}, or can be forced setting
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the environment variable @env{AV_LOG_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 future FFmpeg version.
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@item -report
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Dump full command line and console 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 verbose}.
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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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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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