All the numerical options, if not specified otherwise, accept in input
 a string representing a number, which may contain one of the

 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

 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.
 
 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 specifier, which matches the second audio stream. Therefore it

 would select the ac3 codec for the second audio stream.
 

 A stream specifier can match several streams, 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.

 @item #@var{stream_id}
 Matches the stream by format-specific ID.

 @end table

 @section Generic options
 

 These options are shared amongst the av* tools.

 
 @table @option
 

 @item -L
 Show license.
 

 @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.
 
 @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 all codecs known to libavcodec.

 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 -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 -layouts
 Show channel names and standard channel layouts.
 

 @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{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 FFmpeg version.

 @item -report
 Dump full command line and console output to a file named
 @code{@var{program}-@var{YYYYMMDD}-@var{HHMMSS}.log} in the current
 directory.
 This file can be useful for bug reports.
 It also implies @code{-loglevel verbose}.
 

 Setting the environment variable @code{FFREPORT} to any value has the
 same effect. If the value is a ':'-separated key=value sequence, these
 options will affect the report; options values must be escaped if they
 contain special characters or the options delimiter ':' (see the
 ``Quoting and escaping'' section in the ffmpeg-utils manual). The
 following option is recognized:

 @table @option
 @item file
 set the file name to use for the report; @code{%p} is expanded to the name
 of the program, @code{%t} is expanded to a timestamp, @code{%%} is expanded
 to a plain @code{%}
 @end table
 
 Errors in parsing the environment variable are not fatal, and will not
 appear in the report.

 @item -cpuflags flags (@emph{global})
 Allows setting and clearing cpu flags. This option is intended
 for testing. Do not use it unless you know what you're doing.

 @example
 ffmpeg -cpuflags -sse+mmx ...
 ffmpeg -cpuflags mmx ...
 ffmpeg -cpuflags 0 ...
 @end example

 @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 @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.