All the numerical options, if not specified otherwise, accept in input
a string representing a number, which may contain one of the
-International System number postfixes, for example 'K', 'M', 'G'.
-If 'i' is appended after the postfix, powers of 2 are used instead of
-powers of 10. The 'B' postfix multiplies the value for 8, and can be
-appended after another postfix or used alone. This allows using for
-example 'KB', 'MiB', 'G' and 'B' as postfix.
+SI unit prefixes, for example 'K', 'M', 'G'.
+If 'i' is appended after the prefix, binary prefixes are used,
+which are based on powers of 1024 instead of powers of 1000.
+The 'B' postfix multiplies the value by 8, and can be
+appended after a unit prefix or used alone. This allows using for
+example 'KB', 'MiB', 'G' and 'B' as number postfix.
Options which do not take arguments are boolean options, and set the
corresponding value to true. They can be set to false by prefixing
with "no" the option name, for example using "-nofoo" in the
-commandline will set to false the boolean option with name "foo".
+command line will set to false the boolean option with name "foo".
+@anchor{Stream specifiers}
@section Stream specifiers
Some options are applied per-stream, e.g. bitrate or codec. Stream specifiers
are used to precisely specify which stream(s) does a given option belong to.
Matches the stream with this index. E.g. @code{-threads:1 4} would set the
thread count for the second stream to 4.
@item @var{stream_type}[:@var{stream_index}]
-@var{stream_type} is one of: 'v' for video, 'a' for audio, 's' for subtitle and
-'d' for data. If @var{stream_index} is given, then matches stream number
-@var{stream_index} of this type. Otherwise matches all streams of this type.
-@item @var{program_id}[:@var{stream_index}]
+@var{stream_type} is one of: 'v' for video, 'a' for audio, 's' for subtitle,
+'d' for data and 't' for attachments. If @var{stream_index} is given, then
+matches stream number @var{stream_index} of this type. Otherwise matches all
+streams of this type.
+@item p:@var{program_id}[:@var{stream_index}]
If @var{stream_index} is given, then matches stream number @var{stream_index} in
program with id @var{program_id}. Otherwise matches all streams in this program.
@end table
@item -L
Show license.
-@item -h, -?, -help, --help
-Show help.
+@item -h, -?, -help, --help [@var{arg}]
+Show help. An optional parameter may be specified to print help about a specific
+item.
+
+Possible values of @var{arg} are:
+@table @option
+@item decoder=@var{decoder_name}
+Print detailed information about the decoder named @var{decoder_name}. Use the
+@option{-decoders} option to get a list of all decoders.
+
+@item encoder=@var{encoder_name}
+Print detailed information about the encoder named @var{encoder_name}. Use the
+@option{-encoders} option to get a list of all encoders.
+
+@item demuxer=@var{demuxer_name}
+Print detailed information about the demuxer named @var{demuxer_name}. Use the
+@option{-formats} option to get a list of all demuxers and muxers.
+
+@item muxer=@var{muxer_name}
+Print detailed information about the muxer named @var{muxer_name}. Use the
+@option{-formats} option to get a list of all muxers and demuxers.
+
+@end table
@item -version
Show version.
@end table
@item -codecs
-Show available codecs.
+Show all codecs known to libavcodec.
-The fields preceding the codec names have the following meanings:
-@table @samp
-@item D
-Decoding available
-@item E
-Encoding available
-@item V/A/S
-Video/audio/subtitle codec
-@item S
-Codec supports slices
-@item D
-Codec supports direct rendering
-@item T
-Codec can handle input truncated at random locations instead of only at frame boundaries
-@end table
+Note that the term 'codec' is used throughout this documentation as a shortcut
+for what is more correctly called a media bitstream format.
+
+@item -decoders
+Show available decoders.
+
+@item -encoders
+Show all available encoders.
@item -bsfs
Show available bitstream filters.
@item -sample_fmts
Show available sample formats.
-@item -loglevel @var{loglevel}
+@item -loglevel @var{loglevel} | -v @var{loglevel}
Set the logging level used by the library.
@var{loglevel} is a number or a string containing one of the following values:
@table @samp
By default the program logs to stderr, if coloring is supported by the
terminal, colors are used to mark errors and warnings. Log coloring
can be disabled setting the environment variable
-@env{FFMPEG_FORCE_NOCOLOR} or @env{NO_COLOR}, or can be forced setting
-the environment variable @env{FFMPEG_FORCE_COLOR}.
+@env{AV_LOG_FORCE_NOCOLOR} or @env{NO_COLOR}, or can be forced setting
+the environment variable @env{AV_LOG_FORCE_COLOR}.
The use of the environment variable @env{NO_COLOR} is deprecated and
will be dropped in a following Libav version.
@option{-help} option. They are separated into two categories:
@table @option
@item generic
-These options can be set for any container, codec or device. Generic options are
-listed under AVFormatContext options for containers/devices and under
+These options can be set for any container, codec or device. Generic options
+are listed under AVFormatContext options for containers/devices and under
AVCodecContext options for codecs.
@item private
These options are specific to the given container, device or codec. Private
an MP3 file, use the @option{id3v2_version} private option of the MP3
muxer:
@example
-ffmpeg -i input.flac -id3v2_version 3 out.mp3
+avconv -i input.flac -id3v2_version 3 out.mp3
@end example
All codec AVOptions are obviously per-stream, so the chapter on stream
specifiers applies to them
-Note -nooption syntax cannot be used for boolean AVOptions, use -option
-0/-option 1.
+Note @option{-nooption} syntax cannot be used for boolean AVOptions,
+use @option{-option 0}/@option{-option 1}.
Note2 old undocumented way of specifying per-stream AVOptions by prepending
v/a/s to the options name is now obsolete and will be removed soon.
+
+@include avoptions_codec.texi
+@include avoptions_format.texi
projects / ffmpeg / blobdiff