\input texinfo @c -*- texinfo -*-
 

 @settitle ffmpeg Documentation

 @titlepage

 @center @titlefont{ffmpeg Documentation}

 @end titlepage
 

 @top
 
 @contents
 

 @chapter Synopsis
 

 ffmpeg [@var{global_options}] @{[@var{input_file_options}] -i @file{input_file}@} ... @{[@var{output_file_options}] @file{output_file}@} ...

 @chapter Description
 @c man begin DESCRIPTION

 ffmpeg is a very fast video and audio converter that can also grab from
 a live audio/video source. It can also convert between arbitrary sample
 rates and resize video on the fly with a high quality polyphase filter.

 ffmpeg reads from an arbitrary number of input "files" (which can be regular
 files, pipes, network streams, grabbing devices, etc.), specified by the
 @code{-i} option, and writes to an arbitrary number of output "files", which are

 specified by a plain output filename. Anything found on the command line which

 cannot be interpreted as an option is considered to be an output filename.
 
 Each input or output file can in principle contain any number of streams of
 different types (video/audio/subtitle/attachment/data). Allowed number and/or
 types of streams can be limited by the container format. Selecting, which
 streams from which inputs go into output, is done either automatically or with
 the @code{-map} option (see the Stream selection chapter).
 
 To refer to input files in options, you must use their indices (0-based). E.g.
 the first input file is @code{0}, the second is @code{1} etc. Similarly, streams
 within a file are referred to by their indices. E.g. @code{2:3} refers to the
 fourth stream in the third input file. See also the Stream specifiers chapter.
 

 As a general rule, options are applied to the next specified
 file. Therefore, order is important, and you can have the same
 option on the command line multiple times. Each occurrence is
 then applied to the next input or output file.

 Exceptions from this rule are the global options (e.g. verbosity level),
 which should be specified first.

 Do not mix input and output files -- first specify all input files, then all
 output files. Also do not mix options which belong to different files. All
 options apply ONLY to the next input or output file and are reset between files.
 

 @itemize
 @item
 To set the video bitrate of the output file to 64kbit/s:

 @example

 ffmpeg -i input.avi -b:v 64k -bufsize 64k output.avi

 @end example
 

 @item
 To force the frame rate of the output file to 24 fps:

 @example
 ffmpeg -i input.avi -r 24 output.avi
 @end example
 

 @item
 To force the frame rate of the input file (valid for raw formats only)

 to 1 fps and the frame rate of the output file to 24 fps:
 @example
 ffmpeg -r 1 -i input.m2v -r 24 output.avi
 @end example

 @end itemize

 
 The format option may be needed for raw input files.
 
 @c man end DESCRIPTION
 

 @chapter Detailed description
 @c man begin DETAILED DESCRIPTION
 

 The transcoding process in @command{ffmpeg} for each output can be described by

 the following diagram:
 
 @example
  _______              ______________               _________              ______________            ________
 |       |            |              |             |         |            |              |          |        |
 | input |  demuxer   | encoded data |   decoder   | decoded |  encoder   | encoded data |  muxer   | output |
 | file  | ---------> | packets      |  ---------> | frames  | ---------> | packets      | -------> | file   |
 |_______|            |______________|             |_________|            |______________|          |________|
 
 @end example
 

 @command{ffmpeg} calls the libavformat library (containing demuxers) to read

 input files and get packets containing encoded data from them. When there are

 multiple input files, @command{ffmpeg} tries to keep them synchronized by

 tracking lowest timestamp on any active input stream.
 
 Encoded packets are then passed to the decoder (unless streamcopy is selected
 for the stream, see further for a description). The decoder produces
 uncompressed frames (raw video/PCM audio/...) which can be processed further by
 filtering (see next section). After filtering the frames are passed to the
 encoder, which encodes them and outputs encoded packets again. Finally those are
 passed to the muxer, which writes the encoded packets to the output file.
 
 @section Filtering

 Before encoding, @command{ffmpeg} can process raw audio and video frames using

 filters from the libavfilter library. Several chained filters form a filter

 graph.  @command{ffmpeg} distinguishes between two types of filtergraphs -

 simple and complex.
 
 @subsection Simple filtergraphs
 Simple filtergraphs are those that have exactly one input and output, both of
 the same type. In the above diagram they can be represented by simply inserting
 an additional step between decoding and encoding:
 
 @example
  _________                        __________              ______________
 |         |                      |          |            |              |
 | decoded |  simple filtergraph  | filtered |  encoder   | encoded data |
 | frames  | -------------------> | frames   | ---------> | packets      |
 |_________|                      |__________|            |______________|
 
 @end example
 
 Simple filtergraphs are configured with the per-stream @option{-filter} option
 (with @option{-vf} and @option{-af} aliases for video and audio respectively).
 A simple filtergraph for video can look for example like this:
 
 @example
  _______        _____________        _______        _____        ________
 |       |      |             |      |       |      |     |      |        |
 | input | ---> | deinterlace | ---> | scale | ---> | fps | ---> | output |
 |_______|      |_____________|      |_______|      |_____|      |________|
 
 @end example
 
 Note that some filters change frame properties but not frame contents. E.g. the
 @code{fps} filter in the example above changes number of frames, but does not
 touch the frame contents. Another example is the @code{setpts} filter, which
 only sets timestamps and otherwise passes the frames unchanged.
 
 @subsection Complex filtergraphs
 Complex filtergraphs are those which cannot be described as simply a linear
 processing chain applied to one stream. This is the case e.g. when the graph has
 more than one input and/or output, or when output stream type is different from
 input. They can be represented with the following diagram:
 
 @example
  _________
 |         |
 | input 0 |\                    __________
 |_________| \                  |          |
              \   _________    /| output 0 |
               \ |         |  / |__________|
  _________     \| complex | /
 |         |     |         |/
 | input 1 |---->| filter  |\
 |_________|     |         | \   __________
                /| graph   |  \ |          |
               / |         |   \| output 1 |
  _________   /  |_________|    |__________|
 |         | /
 | input 2 |/
 |_________|
 
 @end example
 
 Complex filtergraphs are configured with the @option{-filter_complex} option.
 Note that this option is global, since a complex filtergraph by its nature
 cannot be unambiguously associated with a single stream or file.
 
 A trivial example of a complex filtergraph is the @code{overlay} filter, which
 has two video inputs and one video output, containing one video overlaid on top
 of the other. Its audio counterpart is the @code{amix} filter.
 
 @section Stream copy
 Stream copy is a mode selected by supplying the @code{copy} parameter to the

 @option{-codec} option. It makes @command{ffmpeg} omit the decoding and encoding

 step for the specified stream, so it does only demuxing and muxing. It is useful
 for changing the container format or modifying container-level metadata. The
 diagram above will in this case simplify to this:
 
 @example
  _______              ______________            ________
 |       |            |              |          |        |
 | input |  demuxer   | encoded data |  muxer   | output |
 | file  | ---------> | packets      | -------> | file   |
 |_______|            |______________|          |________|
 
 @end example
 
 Since there is no decoding or encoding, it is very fast and there is no quality
 loss. However it might not work in some cases because of many factors. Applying
 filters is obviously also impossible, since filters work on uncompressed data.
 
 @c man end DETAILED DESCRIPTION
 

 @chapter Stream selection
 @c man begin STREAM SELECTION
 

 By default ffmpeg includes only one stream of each type (video, audio, subtitle)
 present in the input files and adds them to each output file.  It picks the
 "best" of each based upon the following criteria; for video it is the stream
 with the highest resolution, for audio the stream with the most channels, for
 subtitle it's the first subtitle stream. In the case where several streams of
 the same type rate equally, the lowest numbered stream is chosen.

 
 You can disable some of those defaults by using @code{-vn/-an/-sn} options. For
 full manual control, use the @code{-map} option, which disables the defaults just
 described.
 
 @c man end STREAM SELECTION
 

 @chapter Options

 @c man begin OPTIONS

 @include avtools-common-opts.texi

 @section Main options
 

 @table @option

 @item -f @var{fmt} (@emph{input/output})

 Force input or output file format. The format is normally auto detected for input

 files and guessed from file extension for output files, so this option is not
 needed in most cases.

 @item -i @var{filename} (@emph{input})

 input file name

 @item -y (@emph{global})

 Overwrite output files without asking.

 @item -n (@emph{global})
 Do not overwrite output files but exit if file exists.
 

 @item -c[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
 @itemx -codec[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
 Select an encoder (when used before an output file) or a decoder (when used
 before an input file) for one or more streams. @var{codec} is the name of a
 decoder/encoder or a special value @code{copy} (output only) to indicate that

 the stream is not to be re-encoded.

 
 For example
 @example
 ffmpeg -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
 @end example
 encodes all video streams with libx264 and copies all audio streams.
 
 For each stream, the last matching @code{c} option is applied, so
 @example
 ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
 @end example
 will copy all the streams except the second video, which will be encoded with
 libx264, and the 138th audio, which will be encoded with libvorbis.
 
 @item -t @var{duration} (@emph{output})

 Stop writing the output after its duration reaches @var{duration}.
 @var{duration} may be a number in seconds, or in @code{hh:mm:ss[.xxx]} form.

 @item -fs @var{limit_size} (@emph{output})

 Set the file size limit, expressed in bytes.

 @item -ss @var{position} (@emph{input/output})
 When used as an input option (before @code{-i}), seeks in this input file to
 @var{position}. When used as an output option (before an output filename),
 decodes but discards input until the timestamps reach @var{position}. This is
 slower, but more accurate.

 @var{position} may be either in seconds or in @code{hh:mm:ss[.xxx]} form.
 
 @item -itsoffset @var{offset} (@emph{input})

 Set the input time offset in seconds.
 @code{[-]hh:mm:ss[.xxx]} syntax is also supported.
 The offset is added to the timestamps of the input files.
 Specifying a positive offset means that the corresponding

 streams are delayed by @var{offset} seconds.

 @item -timestamp @var{time} (@emph{output})

 Set the recording timestamp in the container.
 The syntax for @var{time} is:
 @example

 now|([(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...])|(HHMMSS[.m...]))[Z|z])

 @end example
 If the value is "now" it takes the current time.
 Time is local time unless 'Z' or 'z' is appended, in which case it is
 interpreted as UTC.
 If the year-month-day part is not specified it takes the current
 year-month-day.

 @item -metadata[:metadata_specifier] @var{key}=@var{value} (@emph{output,per-metadata})

 Set a metadata key/value pair.

 An optional @var{metadata_specifier} may be given to set metadata
 on streams or chapters. See @code{-map_metadata} documentation for
 details.
 
 This option overrides metadata set with @code{-map_metadata}. It is
 also possible to delete metadata by using an empty value.
 

 For example, for setting the title in the output file:

 @example

 ffmpeg -i in.avi -metadata title="my title" out.flv

 @end example

 To set the language of the first audio stream:

 @example

 ffmpeg -i INPUT -metadata:s:a:1 language=eng OUTPUT

 @end example
 
 @item -target @var{type} (@emph{output})

 Specify target file type (@code{vcd}, @code{svcd}, @code{dvd}, @code{dv},
 @code{dv50}). @var{type} may be prefixed with @code{pal-}, @code{ntsc-} or
 @code{film-} to use the corresponding standard. All the format options
 (bitrate, codecs, buffer sizes) are then set automatically. You can just type:

 
 @example
 ffmpeg -i myfile.avi -target vcd /tmp/vcd.mpg
 @end example
 

 Nevertheless you can specify additional options as long as you know
 they do not conflict with the standard, as in:

 
 @example
 ffmpeg -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
 @end example
 

 @item -dframes @var{number} (@emph{output})
 Set the number of data frames to record. This is an alias for @code{-frames:d}.

 @item -frames[:@var{stream_specifier}] @var{framecount} (@emph{output,per-stream})
 Stop writing to the stream after @var{framecount} frames.

 @item -q[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
 @itemx -qscale[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
 Use fixed quality scale (VBR). The meaning of @var{q} is
 codec-dependent.

 @item -filter[:@var{stream_specifier}] @var{filter_graph} (@emph{output,per-stream})

 @var{filter_graph} is a description of the filter graph to apply to
 the stream. Use @code{-filters} to show all the available filters
 (including also sources and sinks).

 
 See also the @option{-filter_complex} option if you want to create filter graphs
 with multiple inputs and/or outputs.

 @item -pre[:@var{stream_specifier}] @var{preset_name} (@emph{output,per-stream})
 Specify the preset for matching stream(s).
 
 @item -stats (@emph{global})
 Print encoding progress/statistics. On by default.
 

 @item -progress @var{url} (@emph{global})
 Send program-friendly progress information to @var{url}.
 
 Progress information is written approximately every second and at the end of
 the encoding process. It is made of "@var{key}=@var{value}" lines. @var{key}
 consists of only alphanumeric characters. The last key of a sequence of
 progress information is always "progress".
 

 @item -stdin
 Enable interaction on standard input. On by default unless standard input is

 used as an input. To explicitly disable interaction you need to specify
 @code{-nostdin}.

 Disabling interaction on standard input is useful, for example, if
 ffmpeg is in the background process group. Roughly the same result can
 be achieved with @code{ffmpeg ... < /dev/null} but it requires a
 shell.

 @item -debug_ts (@emph{global})
 Print timestamp information. It is off by default. This option is
 mostly useful for testing and debugging purposes, and the output
 format may change from one version to another, so it should not be
 employed by portable scripts.
 
 See also the option @code{-fdebug ts}.
 

 @item -attach @var{filename} (@emph{output})
 Add an attachment to the output file. This is supported by a few formats
 like Matroska for e.g. fonts used in rendering subtitles. Attachments
 are implemented as a specific type of stream, so this option will add
 a new stream to the file. It is then possible to use per-stream options
 on this stream in the usual way. Attachment streams created with this
 option will be created after all the other streams (i.e. those created
 with @code{-map} or automatic mappings).
 
 Note that for Matroska you also have to set the mimetype metadata tag:
 @example
 ffmpeg -i INPUT -attach DejaVuSans.ttf -metadata:s:2 mimetype=application/x-truetype-font out.mkv
 @end example
 (assuming that the attachment stream will be third in the output file).
 
 @item -dump_attachment[:@var{stream_specifier}] @var{filename} (@emph{input,per-stream})
 Extract the matching attachment stream into a file named @var{filename}. If
 @var{filename} is empty, then the value of the @code{filename} metadata tag
 will be used.
 
 E.g. to extract the first attachment to a file named 'out.ttf':
 @example
 ffmpeg -dump_attachment:t:0 out.ttf INPUT
 @end example
 To extract all attachments to files determined by the @code{filename} tag:
 @example
 ffmpeg -dump_attachment:t "" INPUT
 @end example
 
 Technical note -- attachments are implemented as codec extradata, so this
 option can actually be used to extract extradata from any stream, not just
 attachments.

 @end table
 
 @section Video Options
 

 @table @option

 @item -vframes @var{number} (@emph{output})
 Set the number of video frames to record. This is an alias for @code{-frames:v}.
 @item -r[:@var{stream_specifier}] @var{fps} (@emph{input/output,per-stream})

 Set frame rate (Hz value, fraction or abbreviation).
 
 As an input option, ignore any timestamps stored in the file and instead
 generate timestamps assuming constant frame rate @var{fps}.
 
 As an output option, duplicate or drop input frames to achieve constant output

 frame rate @var{fps}.

 @item -s[:@var{stream_specifier}] @var{size} (@emph{input/output,per-stream})

 Set frame size.
 
 As an input option, this is a shortcut for the @option{video_size} private
 option, recognized by some demuxers for which the frame size is either not
 stored in the file or is configurable -- e.g. raw video or video grabbers.
 
 As an output option, this inserts the @code{scale} video filter to the
 @emph{end} of the corresponding filtergraph. Please use the @code{scale} filter
 directly to insert it at the beginning or some other place.
 

 The format is @samp{wxh} (default - same as source).

 @item -aspect[:@var{stream_specifier}] @var{aspect} (@emph{output,per-stream})

 Set the video display aspect ratio specified by @var{aspect}.
 
 @var{aspect} can be a floating point number string, or a string of the
 form @var{num}:@var{den}, where @var{num} and @var{den} are the
 numerator and denominator of the aspect ratio. For example "4:3",
 "16:9", "1.3333", and "1.7777" are valid argument values.
 

 @item -croptop @var{size}
 @item -cropbottom @var{size}
 @item -cropleft @var{size}
 @item -cropright @var{size}
 All the crop options have been removed. Use -vf
 crop=width:height:x:y instead.
 

 @item -padtop @var{size}
 @item -padbottom @var{size}
 @item -padleft @var{size}
 @item -padright @var{size}
 @item -padcolor @var{hex_color}

 All the pad options have been removed. Use -vf
 pad=width:height:x:y:color instead.

 
 @item -vn (@emph{output})

 Disable video recording.

 @item -vcodec @var{codec} (@emph{output})
 Set the video codec. This is an alias for @code{-codec:v}.
 

 @item -pass[:@var{stream_specifier}] @var{n} (@emph{output,per-stream})

 Select the pass number (1 or 2). It is used to do two-pass
 video encoding. The statistics of the video are recorded in the first
 pass into a log file (see also the option -passlogfile),
 and in the second pass that log file is used to generate the video
 at the exact requested bitrate.

 On pass 1, you may just deactivate audio and set output to null,
 examples for Windows and Unix:
 @example

 ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
 ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null

 @end example

 @item -passlogfile[:@var{stream_specifier}] @var{prefix} (@emph{output,per-stream})

 Set two-pass log file name prefix to @var{prefix}, the default file name
 prefix is ``ffmpeg2pass''. The complete file name will be
 @file{PREFIX-N.log}, where N is a number specific to the output

 stream

 @item -vlang @var{code}
 Set the ISO 639 language code (3 letters) of the current video stream.
 

 @item -vf @var{filter_graph} (@emph{output})

 @var{filter_graph} is a description of the filter graph to apply to
 the input video.
 Use the option "-filters" to show all the available filters (including

 also sources and sinks).  This is an alias for @code{-filter:v}.

 @end table
 

 @section Advanced Video Options

 @table @option

 @item -pix_fmt[:@var{stream_specifier}] @var{format} (@emph{input/output,per-stream})
 Set pixel format. Use @code{-pix_fmts} to show all the supported

 pixel formats.

 If the selected pixel format can not be selected, ffmpeg will print a
 warning and select the best pixel format supported by the encoder.
 If @var{pix_fmt} is prefixed by a @code{+}, ffmpeg will exit with an error
 if the requested pixel format can not be selected, and automatic conversions
 inside filter graphs are disabled.
 If @var{pix_fmt} is a single @code{+}, ffmpeg selects the same pixel format
 as the input (or graph output) and automatic conversions are disabled.
 

 @item -sws_flags @var{flags} (@emph{input/output})

 Set SwScaler flags.

 @item -vdt @var{n}

 Discard threshold.

 @item -rc_override[:@var{stream_specifier}] @var{override} (@emph{output,per-stream})

 Rate control override for specific intervals, formatted as "int,int,int"

 list separated with slashes. Two first values are the beginning and
 end frame numbers, last one is quantizer to use if positive, or quality
 factor if negative.

 
 @item -deinterlace

 Deinterlace pictures.

 This option is deprecated since the deinterlacing is very low quality.
 Use the yadif filter with @code{-filter:v yadif}.

 @item -ilme

 Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
 Use this option if your input file is interlaced and you want
 to keep the interlaced format for minimum losses.
 The alternative is to deinterlace the input stream with
 @option{-deinterlace}, but deinterlacing introduces losses.

 @item -psnr

 Calculate PSNR of compressed frames.

 @item -vstats

 Dump video coding statistics to @file{vstats_HHMMSS.log}.

 @item -vstats_file @var{file}

 Dump video coding statistics to @var{file}.

 @item -top[:@var{stream_specifier}] @var{n} (@emph{output,per-stream})

 top=1/bottom=0/auto=-1 field first

 @item -dc @var{precision}

 Intra_dc_precision.

 @item -vtag @var{fourcc/tag} (@emph{output})
 Force video tag/fourcc. This is an alias for @code{-tag:v}.
 @item -qphist (@emph{global})
 Show QP histogram

 @item -vbsf @var{bitstream_filter}

 Deprecated see -bsf
 @item -force_key_frames[:@var{stream_specifier}] @var{time}[,@var{time}...] (@emph{output,per-stream})

 Force key frames at the specified timestamps, more precisely at the first
 frames after each specified time.
 This option can be useful to ensure that a seek point is present at a
 chapter mark or any other designated place in the output file.
 The timestamps must be specified in ascending order.

 
 @item -copyinkf[:@var{stream_specifier}] (@emph{output,per-stream})
 When doing stream copy, copy also non-key frames found at the
 beginning.

 @end table
 
 @section Audio Options
 
 @table @option

 @item -aframes @var{number} (@emph{output})
 Set the number of audio frames to record. This is an alias for @code{-frames:a}.
 @item -ar[:@var{stream_specifier}] @var{freq} (@emph{input/output,per-stream})

 Set the audio sampling frequency. For output streams it is set by
 default to the frequency of the corresponding input stream. For input
 streams this option only makes sense for audio grabbing devices and raw
 demuxers and is mapped to the corresponding demuxer options.

 @item -aq @var{q} (@emph{output})
 Set the audio quality (codec-specific, VBR). This is an alias for -q:a.
 @item -ac[:@var{stream_specifier}] @var{channels} (@emph{input/output,per-stream})

 Set the number of audio channels. For output streams it is set by
 default to the number of input audio channels. For input streams
 this option only makes sense for audio grabbing devices and raw demuxers
 and is mapped to the corresponding demuxer options.

 @item -an (@emph{output})

 Disable audio recording.

 @item -acodec @var{codec} (@emph{input/output})
 Set the audio codec. This is an alias for @code{-codec:a}.
 @item -sample_fmt[:@var{stream_specifier}] @var{sample_fmt} (@emph{output,per-stream})

 Set the audio sample format. Use @code{-sample_fmts} to get a list

 of supported sample formats.

 @item -af @var{filter_graph} (@emph{output})
 @var{filter_graph} is a description of the filter graph to apply to
 the input audio.
 Use the option "-filters" to show all the available filters (including
 also sources and sinks).  This is an alias for @code{-filter:a}.

 @end table
 
 @section Advanced Audio options:
 
 @table @option

 @item -atag @var{fourcc/tag} (@emph{output})
 Force audio tag/fourcc. This is an alias for @code{-tag:a}.

 @item -absf @var{bitstream_filter}

 Deprecated, see -bsf

 @end table
 
 @section Subtitle options:
 
 @table @option

 @item -slang @var{code}

 Set the ISO 639 language code (3 letters) of the current subtitle stream.

 @item -scodec @var{codec} (@emph{input/output})
 Set the subtitle codec. This is an alias for @code{-codec:s}.
 @item -sn (@emph{output})

 Disable subtitle recording.

 @item -sbsf @var{bitstream_filter}

 Deprecated, see -bsf

 @end table
 

 @section Advanced Subtitle options:
 
 @table @option
 
 @item -fix_sub_duration
 Fix subtitles durations. For each subtitle, wait for the next packet in the
 same stream and adjust the duration of the first to avoid overlap. This is
 necessary with some subtitles codecs, especially DVB subtitles, because the
 duration in the original packet is only a rough estimate and the end is
 actually marked by an empty subtitle frame. Failing to use this option when
 necessary can result in exaggerated durations or muxing failures due to
 non-monotonic timestamps.
 
 Note that this option will delay the output of all data until the next
 subtitle packet is decoded: it may increase memory consumption and latency a
 lot.
 
 @end table
 

 @section Advanced options
 
 @table @option

 @item -map [-]@var{input_file_id}[:@var{stream_specifier}][,@var{sync_file_id}[:@var{stream_specifier}]] | @var{[linklabel]} (@emph{output})

 Designate one or more input streams as a source for the output file. Each input

 stream is identified by the input file index @var{input_file_id} and
 the input stream index @var{input_stream_id} within the input

 file. Both indices start at 0. If specified,
 @var{sync_file_id}:@var{stream_specifier} sets which input stream

 is used as a presentation sync reference.
 

 The first @code{-map} option on the command line specifies the

 source for output stream 0, the second @code{-map} option specifies
 the source for output stream 1, etc.
 

 A @code{-} character before the stream identifier creates a "negative" mapping.
 It disables matching streams from already created mappings.
 

 An alternative @var{[linklabel]} form will map outputs from complex filter
 graphs (see the @option{-filter_complex} option) to the output file.
 @var{linklabel} must correspond to a defined output link label in the graph.
 

 For example, to map ALL streams from the first input file to output
 @example
 ffmpeg -i INPUT -map 0 output
 @end example
 

 For example, if you have two audio streams in the first input file,

 these streams are identified by "0:0" and "0:1". You can use
 @code{-map} to select which streams to place in an output file. For

 example:
 @example

 ffmpeg -i INPUT -map 0:1 out.wav

 @end example

 will map the input stream in @file{INPUT} identified by "0:1" to

 the (single) output stream in @file{out.wav}.
 
 For example, to select the stream with index 2 from input file

 @file{a.mov} (specified by the identifier "0:2"), and stream with
 index 6 from input @file{b.mov} (specified by the identifier "1:6"),

 and copy them to the output file @file{out.mov}:
 @example

 ffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov

 @end example
 

 To select all video and the third audio stream from an input file:
 @example
 ffmpeg -i INPUT -map 0:v -map 0:a:2 OUTPUT
 @end example

 To map all the streams except the second audio, use negative mappings
 @example
 ffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT
 @end example

 Note that using this option disables the default mappings for this output file.
 

 @item -map_channel [@var{input_file_id}.@var{stream_specifier}.@var{channel_id}|-1][:@var{output_file_id}.@var{stream_specifier}]
 Map an audio channel from a given input to an output. If

 @var{output_file_id}.@var{stream_specifier} is not set, the audio channel will

 be mapped on all the audio streams.
 
 Using "-1" instead of
 @var{input_file_id}.@var{stream_specifier}.@var{channel_id} will map a muted
 channel.
 
 For example, assuming @var{INPUT} is a stereo audio file, you can switch the
 two audio channels with the following command:
 @example
 ffmpeg -i INPUT -map_channel 0.0.1 -map_channel 0.0.0 OUTPUT
 @end example
 
 If you want to mute the first channel and keep the second:
 @example
 ffmpeg -i INPUT -map_channel -1 -map_channel 0.0.1 OUTPUT
 @end example
 
 The order of the "-map_channel" option specifies the order of the channels in
 the output stream. The output channel layout is guessed from the number of
 channels mapped (mono if one "-map_channel", stereo if two, etc.). Using "-ac"
 in combination of "-map_channel" makes the channel gain levels to be updated if

 input and output channel layouts don't match (for instance two "-map_channel"
 options and "-ac 6").

 You can also extract each channel of an input to specific outputs; the following
 command extracts two channels of the @var{INPUT} audio stream (file 0, stream 0)
 to the respective @var{OUTPUT_CH0} and @var{OUTPUT_CH1} outputs:

 @example
 ffmpeg -i INPUT -map_channel 0.0.0 OUTPUT_CH0 -map_channel 0.0.1 OUTPUT_CH1
 @end example
 

 The following example splits the channels of a stereo input into two separate
 streams, which are put into the same output file:

 @example
 ffmpeg -i stereo.wav -map 0:0 -map 0:0 -map_channel 0.0.0:0.0 -map_channel 0.0.1:0.1 -y out.ogg
 @end example
 

 Note that currently each output stream can only contain channels from a single
 input stream; you can't for example use "-map_channel" to pick multiple input
 audio channels contained in different streams (from the same or different files)
 and merge them into a single output stream. It is therefore not currently
 possible, for example, to turn two separate mono streams into a single stereo

 stream. However splitting a stereo stream into two single channel mono streams

 is possible.

 If you need this feature, a possible workaround is to use the @emph{amerge}
 filter. For example, if you need to merge a media (here @file{input.mkv}) with 2
 mono audio streams into one single stereo channel audio stream (and keep the

 video stream), you can use the following command:

 @example

 ffmpeg -i input.mkv -filter_complex "[0:1] [0:2] amerge" -c:a pcm_s16le -c:v copy output.mkv

 @end example
 

 @item -map_metadata[:@var{metadata_spec_out}] @var{infile}[:@var{metadata_spec_in}] (@emph{output,per-metadata})

 Set metadata information of the next output file from @var{infile}. Note that
 those are file indices (zero-based), not filenames.

 Optional @var{metadata_spec_in/out} parameters specify, which metadata to copy.
 A metadata specifier can have the following forms:
 @table @option
 @item @var{g}
 global metadata, i.e. metadata that applies to the whole file
 
 @item @var{s}[:@var{stream_spec}]
 per-stream metadata. @var{stream_spec} is a stream specifier as described
 in the @ref{Stream specifiers} chapter. In an input metadata specifier, the first
 matching stream is copied from. In an output metadata specifier, all matching
 streams are copied to.
 
 @item @var{c}:@var{chapter_index}
 per-chapter metadata. @var{chapter_index} is the zero-based chapter index.
 
 @item @var{p}:@var{program_index}
 per-program metadata. @var{program_index} is the zero-based program index.
 @end table
 If metadata specifier is omitted, it defaults to global.

 By default, global metadata is copied from the first input file,

 per-stream and per-chapter metadata is copied along with streams/chapters. These
 default mappings are disabled by creating any mapping of the relevant type. A negative
 file index can be used to create a dummy mapping that just disables automatic copying.
 

 For example to copy metadata from the first stream of the input file to global metadata
 of the output file:
 @example

 ffmpeg -i in.ogg -map_metadata 0:s:0 out.mp3

 @end example

 
 To do the reverse, i.e. copy global metadata to all audio streams:
 @example
 ffmpeg -i in.mkv -map_metadata:s:a 0:g out.mkv
 @end example
 Note that simple @code{0} would work as well in this example, since global
 metadata is assumed by default.
 

 @item -map_chapters @var{input_file_index} (@emph{output})
 Copy chapters from input file with index @var{input_file_index} to the next
 output file. If no chapter mapping is specified, then chapters are copied from
 the first input file with at least one chapter. Use a negative file index to
 disable any chapter copying.

 @item -benchmark (@emph{global})

 Show benchmarking information at the end of an encode.
 Shows CPU time used and maximum memory consumption.
 Maximum memory consumption is not supported on all systems,
 it will usually display as 0 if not supported.

 @item -benchmark_all (@emph{global})
 Show benchmarking information during the encode.
 Shows CPU time used in various steps (audio/video encode/decode).

 @item -timelimit @var{duration} (@emph{global})
 Exit after ffmpeg has been running for @var{duration} seconds.

 @item -dump (@emph{global})

 Dump each input packet to stderr.

 @item -hex (@emph{global})

 When dumping packets, also dump the payload.

 @item -re (@emph{input})

 Read input at native frame rate. Mainly used to simulate a grab device.

 By default @command{ffmpeg} attempts to read the input(s) as fast as possible.
 This option will slow down the reading of the input(s) to the native frame rate
 of the input(s). It is useful for real-time output (e.g. live streaming). If
 your input(s) is coming from some other live streaming source (through HTTP or
 UDP for example) the server might already be in real-time, thus the option will
 likely not be required. On the other hand, this is meaningful if your input(s)
 is a file you are trying to push in real-time.

 @item -loop_input

 Loop over the input stream. Currently it works only for image
 streams. This option is used for automatic FFserver testing.

 This option is deprecated, use -loop 1.

 @item -loop_output @var{number_of_times}

 Repeatedly loop output for formats that support looping such as animated GIF

 (0 will loop the output infinitely).

 This option is deprecated, use -loop.

 @item -vsync @var{parameter}

 Video sync method.

 For compatibility reasons old values can be specified as numbers.
 Newly added values will have to be specified as strings always.

 
 @table @option

 @item 0, passthrough

 Each frame is passed with its timestamp from the demuxer to the muxer.

 @item 1, cfr

 Frames will be duplicated and dropped to achieve exactly the requested
 constant framerate.

 @item 2, vfr

 Frames are passed through with their timestamp or dropped so as to
 prevent 2 frames from having the same timestamp.

 @item drop
 As passthrough but destroys all timestamps, making the muxer generate
 fresh timestamps based on frame-rate.

 @item -1, auto

 Chooses between 1 and 2 depending on muxer capabilities. This is the
 default method.
 @end table
 
 With -map you can select from which stream the timestamps should be
 taken. You can leave either video or audio unchanged and sync the
 remaining stream(s) to the unchanged one.
 

 @item -async @var{samples_per_second}

 Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,

 the parameter is the maximum samples per second by which the audio is changed.
 -async 1 is a special case where only the start of the audio stream is corrected
 without any later correction.

 This option has been deprecated. Use the @code{aresample} audio filter instead.

 @item -copyts

 Do not process input timestamps, but keep their values without trying
 to sanitize them. In particular, do not remove the initial start time
 offset value.
 
 Note that, depending on the @option{vsync} option or on specific muxer
 processing, the output timestamps may mismatch with the input
 timestamps even when this option is selected.
 

 @item -copytb @var{mode}
 Specify how to set the encoder timebase when stream copying.  @var{mode} is an
 integer numeric value, and can assume one of the following values:
 
 @table @option
 @item 1
 Use the demuxer timebase.
 
 The time base is copied to the output encoder from the corresponding input
 demuxer. This is sometimes required to avoid non monotonically increasing
 timestamps when copying video streams with variable frame rate.
 
 @item 0
 Use the decoder timebase.
 
 The time base is copied to the output encoder from the corresponding input
 decoder.
 
 @item -1
 Try to make the choice automatically, in order to generate a sane output.
 @end table
 
 Default value is -1.
 

 @item -shortest (@emph{output})

 Finish encoding when the shortest input stream ends.
 @item -dts_delta_threshold
 Timestamp discontinuity delta threshold.

 @item -muxdelay @var{seconds} (@emph{input})

 Set the maximum demux-decode delay.

 @item -muxpreload @var{seconds} (@emph{input})

 Set the initial demux-decode delay.

 @item -streamid @var{output-stream-index}:@var{new-value} (@emph{output})

 Assign a new stream-id value to an output stream. This option should be
 specified prior to the output filename to which it applies.
 For the situation where multiple output files exist, a streamid
 may be reassigned to a different value.

 
 For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
 an output mpegts file:
 @example
 ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
 @end example

 
 @item -bsf[:@var{stream_specifier}] @var{bitstream_filters} (@emph{output,per-stream})

 Set bitstream filters for matching streams. @var{bitstream_filters} is

 a comma-separated list of bitstream filters. Use the @code{-bsfs} option
 to get the list of bitstream filters.
 @example

 ffmpeg -i h264.mp4 -c:v copy -bsf:v h264_mp4toannexb -an out.h264

 @end example
 @example

 ffmpeg -i file.mov -an -vn -bsf:s mov2textsub -c:s copy -f rawvideo sub.txt

 @end example
 

 @item -tag[:@var{stream_specifier}] @var{codec_tag} (@emph{per-stream})

 Force a tag/fourcc for matching streams.

 
 @item -timecode @var{hh}:@var{mm}:@var{ss}SEP@var{ff}
 Specify Timecode for writing. @var{SEP} is ':' for non drop timecode and ';'
 (or '.') for drop.
 @example
 ffmpeg -i input.mpg -timecode 01:02:03.04 -r 30000/1001 -s ntsc output.mpg
 @end example

 
 @item -filter_complex @var{filtergraph} (@emph{global})
 Define a complex filter graph, i.e. one with arbitrary number of inputs and/or
 outputs. For simple graphs -- those with one input and one output of the same
 type -- see the @option{-filter} options. @var{filtergraph} is a description of

 the filter graph, as described in the ``Filtergraph syntax'' section of the
 ffmpeg-filters manual.

 
 Input link labels must refer to input streams using the
 @code{[file_index:stream_specifier]} syntax (i.e. the same as @option{-map}
 uses). If @var{stream_specifier} matches multiple streams, the first one will be
 used. An unlabeled input will be connected to the first unused input stream of
 the matching type.
 
 Output link labels are referred to with @option{-map}. Unlabeled outputs are
 added to the first output file.
 

 Note that with this option it is possible to use only lavfi sources without
 normal input files.
 

 For example, to overlay an image over video
 @example

 ffmpeg -i video.mkv -i image.png -filter_complex '[0:v][1:v]overlay[out]' -map

 '[out]' out.mkv
 @end example
 Here @code{[0:v]} refers to the first video stream in the first input file,
 which is linked to the first (main) input of the overlay filter. Similarly the
 first video stream in the second input is linked to the second (overlay) input
 of overlay.
 
 Assuming there is only one video stream in each input file, we can omit input
 labels, so the above is equivalent to
 @example

 ffmpeg -i video.mkv -i image.png -filter_complex 'overlay[out]' -map

 '[out]' out.mkv
 @end example
 
 Furthermore we can omit the output label and the single output from the filter
 graph will be added to the output file automatically, so we can simply write
 @example

 ffmpeg -i video.mkv -i image.png -filter_complex 'overlay' out.mkv

 @end example

 
 To generate 5 seconds of pure red video using lavfi @code{color} source:
 @example

 ffmpeg -filter_complex 'color=red' -t 5 out.mkv

 @end example

 @end table

 As a special exception, you can use a bitmap subtitle stream as input: it
 will be converted into a video with the same size as the largest video in

 the file, or 720x576 if no video is present. Note that this is an

 experimental and temporary solution. It will be removed once libavfilter has
 proper support for subtitles.
 
 For example, to hardcode subtitles on top of a DVB-T recording stored in
 MPEG-TS format, delaying the subtitles by 1 second:
 @example
 ffmpeg -i input.ts -filter_complex \
   '[#0x2ef] setpts=PTS+1/TB [sub] ; [#0x2d0] [sub] overlay' \
   -sn -map '#0x2dc' output.mkv
 @end example
 (0x2d0, 0x2dc and 0x2ef are the MPEG-TS PIDs of respectively the video,
 audio and subtitles streams; 0:0, 0:3 and 0:7 would have worked too)
 

 @section Preset files
 A preset file contains a sequence of @var{option}=@var{value} pairs,
 one for each line, specifying a sequence of options which would be
 awkward to specify on the command line. Lines starting with the hash
 ('#') character are ignored and are used to provide comments. Check

 the @file{presets} directory in the FFmpeg source tree for examples.

 Preset files are specified with the @code{vpre}, @code{apre},
 @code{spre}, and @code{fpre} options. The @code{fpre} option takes the
 filename of the preset instead of a preset name as input and can be
 used for any kind of codec. For the @code{vpre}, @code{apre}, and
 @code{spre} options, the options specified in a preset file are

 applied to the currently selected codec of the same type as the preset
 option.

 The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
 preset options identifies the preset file to use according to the
 following rules:

 
 First ffmpeg searches for a file named @var{arg}.ffpreset in the

 directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
 the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})

 or in a @file{ffpresets} folder along the executable on win32,

 in that order. For example, if the argument is @code{libvpx-1080p}, it will
 search for the file @file{libvpx-1080p.ffpreset}.

 
 If no such file is found, then ffmpeg will search for a file named
 @var{codec_name}-@var{arg}.ffpreset in the above-mentioned
 directories, where @var{codec_name} is the name of the codec to which
 the preset file options will be applied. For example, if you select

 the video codec with @code{-vcodec libvpx} and use @code{-vpre 1080p},
 then it will search for the file @file{libvpx-1080p.ffpreset}.

 @c man end OPTIONS

 @chapter Tips

 @c man begin TIPS

 
 @itemize

 @item
 For streaming at very low bitrate application, use a low frame rate

 and a small GOP size. This is especially true for RealVideo where

 the Linux player does not seem to be very fast, so it can miss
 frames. An example is:

 
 @example

 ffmpeg -g 3 -r 3 -t 10 -b:v 50k -s qcif -f rv10 /tmp/b.rm

 @end example
 

 @item
 The parameter 'q' which is displayed while encoding is the current

 quantizer. The value 1 indicates that a very good quality could
 be achieved. The value 31 indicates the worst quality. If q=31 appears

 too often, it means that the encoder cannot compress enough to meet

 your bitrate. You must either increase the bitrate, decrease the

 frame rate or decrease the frame size.

 @item
 If your computer is not fast enough, you can speed up the

 compression at the expense of the compression ratio. You can use

 '-me zero' to speed up motion estimation, and '-g 0' to disable

 motion estimation completely (you have only I-frames, which means it

 is about as good as JPEG compression).

 @item
 To have very low audio bitrates, reduce the sampling frequency

 (down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).

 @item
 To have a constant quality (but a variable bitrate), use the option

 '-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
 quality).

 
 @end itemize

 @c man end TIPS

 @chapter Examples
 @c man begin EXAMPLES
 

 @section Preset files
 
 A preset file contains a sequence of @var{option=value} pairs, one for
 each line, specifying a sequence of options which can be specified also on
 the command line. Lines starting with the hash ('#') character are ignored and
 are used to provide comments. Empty lines are also ignored. Check the
 @file{presets} directory in the FFmpeg source tree for examples.
 
 Preset files are specified with the @code{pre} option, this option takes a
 preset name as input.  FFmpeg searches for a file named @var{preset_name}.avpreset in
 the directories @file{$AVCONV_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
 the data directory defined at configuration time (usually @file{$PREFIX/share/ffmpeg})
 in that order.  For example, if the argument is @code{libx264-max}, it will
 search for the file @file{libx264-max.avpreset}.
 

 @section Video and Audio grabbing
 

 If you specify the input format and device then ffmpeg can grab video
 and audio directly.

 
 @example
 ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg

 @end example
 
 Or with an ALSA audio source (mono input, card id 1) instead of OSS:
 @example
 ffmpeg -f alsa -ac 1 -i hw:1 -f video4linux2 -i /dev/video0 /tmp/out.mpg

 @end example
 
 Note that you must activate the right video source and channel before

 launching ffmpeg with any TV viewer such as
 @uref{http://linux.bytesex.org/xawtv/, xawtv} by Gerd Knorr. You also

 have to set the audio recording levels correctly with a
 standard mixer.
 
 @section X11 grabbing
 

 Grab the X11 display with ffmpeg via

 
 @example

 ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg

 @end example
 
 0.0 is display.screen number of your X11 server, same as
 the DISPLAY environment variable.
 
 @example

 ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg

 @end example
 

 0.0 is display.screen number of your X11 server, same as the DISPLAY environment
 variable. 10 is the x-offset and 20 the y-offset for the grabbing.

 
 @section Video and Audio file format conversion
 

 Any supported file format and protocol can serve as input to ffmpeg:

 
 Examples:

 @itemize
 @item
 You can use YUV files as input:

 
 @example
 ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
 @end example
 
 It will use the files:
 @example
 /tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
 /tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
 @end example
 
 The Y files use twice the resolution of the U and V files. They are
 raw files, without header. They can be generated by all decent video
 decoders. You must specify the size of the image with the @option{-s} option

 if ffmpeg cannot guess it.

 @item
 You can input from a raw YUV420P file:

 
 @example
 ffmpeg -i /tmp/test.yuv /tmp/out.avi
 @end example
 
 test.yuv is a file containing raw YUV planar data. Each frame is composed
 of the Y plane followed by the U and V planes at half vertical and
 horizontal resolution.
 

 @item
 You can output to a raw YUV420P file:

 
 @example
 ffmpeg -i mydivx.avi hugefile.yuv
 @end example
 

 @item
 You can set several input files and output files:

 
 @example
 ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
 @end example
 
 Converts the audio file a.wav and the raw YUV video file a.yuv
 to MPEG file a.mpg.
 

 @item
 You can also do audio and video conversions at the same time:

 
 @example
 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
 @end example
 
 Converts a.wav to MPEG audio at 22050 Hz sample rate.
 

 @item
 You can encode to several formats at the same time and define a

 mapping from input stream to output streams:
 
 @example

 ffmpeg -i /tmp/a.wav -map 0:a -b:a 64k /tmp/a.mp2 -map 0:a -b:a 128k /tmp/b.mp2

 @end example
 
 Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
 file:index' specifies which input stream is used for each output
 stream, in the order of the definition of output streams.
 

 @item
 You can transcode decrypted VOBs:

 
 @example

 ffmpeg -i snatch_1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi

 @end example
 
 This is a typical DVD ripping example; the input is a VOB file, the
 output an AVI file with MPEG-4 video and MP3 audio. Note that in this
 command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
 GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
 input video. Furthermore, the audio stream is MP3-encoded so you need
 to enable LAME support by passing @code{--enable-libmp3lame} to configure.
 The mapping is particularly useful for DVD transcoding
 to get the desired audio language.
 
 NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
 

 @item
 You can extract images from a video, or create a video from many images:

 
 For extracting images from a video:
 @example
 ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
 @end example
 
 This will extract one video frame per second from the video and will
 output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
 etc. Images will be rescaled to fit the new WxH values.
 
 If you want to extract just a limited number of frames, you can use the
 above command in combination with the -vframes or -t option, or in
 combination with -ss to start extracting from a certain point in time.
 
 For creating a video from many images:
 @example
 ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
 @end example
 
 The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
 composed of three digits padded with zeroes to express the sequence
 number. It is the same syntax supported by the C printf function, but

 only formats accepting a normal integer are suitable.
 

 When importing an image sequence, -i also supports expanding
 shell-like wildcard patterns (globbing) internally, by selecting the
 image2-specific @code{-pattern_type glob} option.
 
 For example, for creating a video from filenames matching the glob pattern
 @code{foo-*.jpeg}:
 @example
 ffmpeg -f image2 -pattern_type glob -i 'foo-*.jpeg' -r 12 -s WxH foo.avi
 @end example

 @item
 You can put many streams of the same type in the output:

 
 @example

 ffmpeg -i test1.avi -i test2.avi -map 1:1 -map 1:0 -map 0:1 -map 0:0 -c copy -y test12.nut

 @end example
 

 The resulting output file @file{test12.nut} will contain the first four streams
 from the input files in reverse order.

 @item
 To force CBR video output:
 @example

 ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v

 @end example
 
 @item
 The four options lmin, lmax, mblmin and mblmax use 'lambda' units,
 but you may use the QP2LAMBDA constant to easily convert from 'q' units:
 @example

 ffmpeg -i src.ext -lmax 21*QP2LAMBDA dst.ext

 @end example
 

 @end itemize

 @c man end EXAMPLES
 

 @chapter See Also
 
 @ifhtml
 @url{ffplay.html,ffplay}, @url{ffprobe.html,ffprobe}, @url{ffserver.html,ffserver},
 @url{ffmpeg-utils.html,ffmpeg-utils},
 @url{ffmpeg-scaler.html,ffmpeg-scaler},
 @url{ffmpeg-resampler.html,ffmpeg-resampler},
 @url{ffmpeg-codecs.html,ffmpeg-codecs},
 @url{ffmpeg-bitstream-filters,ffmpeg-bitstream-filters},
 @url{ffmpeg-formats.html,ffmpeg-formats},
 @url{ffmpeg-devices.html,ffmpeg-devices},
 @url{ffmpeg-protocols.html,ffmpeg-protocols},
 @url{ffmpeg-filters.html,ffmpeg-filters}
 @end ifhtml
 
 @ifnothtml
 ffplay(1), ffprobe(1), ffserver(1),
 ffmpeg-utils(1), ffmpeg-scaler(1), ffmpeg-resampler(1),
 ffmpeg-codecs(1), ffmpeg-bitstream-filters(1), ffmpeg-formats(1),
 ffmpeg-devices(1), ffmpeg-protocols(1), ffmpeg-filters(1)
 @end ifnothtml
 

 @include authors.texi
 

 @ignore
 
 @setfilename ffmpeg

 @settitle ffmpeg video converter

 
 @end ignore
 

 @bye