mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
157 lines
5.0 KiB
157 lines
5.0 KiB
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. |
|
|
|
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". |
|
|
|
@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. |
|
|
|
A stream specifier is a string generally appended to the option name and |
|
separated from it by a colon. E.g. @code{-codec:a:1 ac3} option contains |
|
@code{a:1} stream specifer, which matches the second audio stream. Therefore it |
|
would select the ac3 codec for the second audio stream. |
|
|
|
A stream specifier can match several stream, the option is then applied to all |
|
of them. E.g. the stream specifier in @code{-b:a 128k} matches all audio |
|
streams. |
|
|
|
An empty stream specifier matches all streams, for example @code{-codec copy} |
|
or @code{-codec: copy} would copy all the streams without reencoding. |
|
|
|
Possible forms of stream specifiers are: |
|
@table @option |
|
@item @var{stream_index} |
|
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, |
|
'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 |
|
@section Generic options |
|
|
|
These options are shared amongst the av* tools. |
|
|
|
@table @option |
|
|
|
@item -L |
|
Show license. |
|
|
|
@item -h, -?, -help, --help |
|
Show help. |
|
|
|
@item -version |
|
Show version. |
|
|
|
@item -formats |
|
Show available formats. |
|
|
|
The fields preceding the format names have the following meanings: |
|
@table @samp |
|
@item D |
|
Decoding available |
|
@item E |
|
Encoding available |
|
@end table |
|
|
|
@item -codecs |
|
Show available codecs. |
|
|
|
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 |
|
|
|
@item -bsfs |
|
Show available bitstream filters. |
|
|
|
@item -protocols |
|
Show available protocols. |
|
|
|
@item -filters |
|
Show available libavfilter filters. |
|
|
|
@item -pix_fmts |
|
Show available pixel formats. |
|
|
|
@item -sample_fmts |
|
Show available sample formats. |
|
|
|
@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 |
|
@item quiet |
|
@item panic |
|
@item fatal |
|
@item error |
|
@item warning |
|
@item info |
|
@item verbose |
|
@item debug |
|
@end table |
|
|
|
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}. |
|
The use of the environment variable @env{NO_COLOR} is deprecated and |
|
will be dropped in a following Libav version. |
|
|
|
@end table |
|
|
|
@section AVOptions |
|
|
|
These options are provided directly by the libavformat, libavdevice and |
|
libavcodec libraries. To see the list of available AVOptions, use the |
|
@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 |
|
AVCodecContext options for codecs. |
|
@item private |
|
These options are specific to the given container, device or codec. Private |
|
options are listed under their corresponding containers/devices/codecs. |
|
@end table |
|
|
|
For example to write an ID3v2.3 header instead of a default ID3v2.4 to |
|
an MP3 file, use the @option{id3v2_version} private option of the MP3 |
|
muxer: |
|
@example |
|
ffmpeg -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. |
|
|
|
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.
|
|
|