@example
@c man begin SYNOPSIS
-avconv [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{outfile}@}...
+avconv [global options] [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{outfile}@}...
@c man end
@end example
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.
-The command line interface is designed to be intuitive, in the sense
-that avconv tries to figure out all parameters that can possibly be
-derived automatically. You usually only have to specify the target
-bitrate you want.
+avconv 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
The format option may be needed for raw input files.
-By default avconv tries to convert as losslessly as possible: It
-uses the same audio and video parameters for the outputs as the one
-specified for the inputs.
-
@c man end DESCRIPTION
@chapter Stream selection
@chapter Options
@c man begin OPTIONS
-@include fftools-common-opts.texi
+@include avtools-common-opts.texi
@section Main options
@table @option
-@item -f @var{fmt}
-Force format.
+@item -f @var{fmt} (@emph{input/output})
+Force input or output file format. The format is normally autodetected for input
+files and guessed from file extension for output files, so this option is not
+needed in most cases.
-@item -i @var{filename}
+@item -i @var{filename} (@emph{input})
input file name
-@item -y
-Overwrite output files.
+@item -y (@emph{global})
+Overwrite output files without asking.
-@item -c[:@var{stream_type}][:@var{stream_index}] @var{codec}
-@item -codec[:@var{stream_type}][:@var{stream_index}] @var{codec}
+@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 reencoded.
-@var{stream_type} may be 'v' for video, 'a' for audio, 's' for subtitle and 'd'
-for data streams. @var{stream_index} is a global zero-based stream index if
-@var{stream_type} isn't given, otherwise it counts only streams of the given
-type. If @var{stream_index} is omitted, this option applies to all streams of
-the given type or all streams of any type if @var{stream_type} is missing as
-well (note that this only makes sense when all streams are of the same type or
-@var{codec} is @code{copy}).
-
For example
@example
avconv -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
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}
-Restrict the transcoded/captured video sequence
-to the duration specified in seconds.
-@code{hh:mm:ss[.xxx]} syntax is also supported.
+@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}
+@item -fs @var{limit_size} (@emph{output})
Set the file size limit.
-@item -ss @var{position}
+@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
@var{position} may be either in seconds or in @code{hh:mm:ss[.xxx]} form.
-@item -itsoffset @var{offset}
+@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 'offset' seconds.
-
-@item -timestamp @var{time}
-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...]]])|(HH[MM[SS[.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.
+streams are delayed by @var{offset} seconds.
-@item -metadata[:metadata_specifier] @var{key}=@var{value}
+@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
avconv -i in.avi -metadata title="my title" out.flv
@end example
-To set the language of the second stream:
+To set the language of the first audio stream:
@example
-avconv -i INPUT -metadata:s:1 language=eng OUTPUT
+avconv -i INPUT -metadata:s:a:0 language=eng OUTPUT
@end example
-@item -v @var{number}
-Set the logging verbosity level.
-
-@item -target @var{type}
-Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd",
-"ntsc-svcd", ... ). All the format options (bitrate, codecs,
-buffer sizes) are then set automatically. You can just type:
+@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
avconv -i myfile.avi -target vcd /tmp/vcd.mpg
avconv -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
@end example
-@item -dframes @var{number}
+@item -dframes @var{number} (@emph{output})
Set the number of data frames to record. This is an alias for @code{-frames:d}.
-@item -frames[:stream_specifier] @var{framecount}
+@item -frames[:@var{stream_specifier}] @var{framecount} (@emph{output,per-stream})
Stop writing to the stream after @var{framecount} frames.
-@item -q @var{q}
-@item -qscale @var{q}
+@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).
+@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 -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
+avconv -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
+avconv -dump_attachment:t:0 out.ttf INPUT
+@end example
+To extract all attachments to files determined by the @code{filename} tag:
+@example
+avconv -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}
+@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{fps}
-Set frame rate (Hz value, fraction or abbreviation), (default = 25).
-@item -s @var{size}
-Set frame size. The format is @samp{wxh} (avserver default = 160x128, avconv default = same as source).
+@item -r[:@var{stream_specifier}] @var{fps} (@emph{input/output,per-stream})
+Set frame rate (Hz value, fraction or abbreviation), (default = 25). For output
+streams implies @code{-vsync cfr}.
+@item -s[:@var{stream_specifier}] @var{size} (@emph{input/output,per-stream})
+Set frame size. The format is @samp{wxh} (default - same as source).
The following abbreviations are recognized:
@table @samp
@item sqcif
1920x1080
@end table
-@item -aspect @var{aspect}
+@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
numerator and denominator of the aspect ratio. For example "4:3",
"16:9", "1.3333", and "1.7777" are valid argument values.
-@item -vn
+@item -vn (@emph{output})
Disable video recording.
@item -bt @var{tolerance}
Set video bitrate tolerance (in bits, default 4000k).
It is of little use elsewise.
@item -bufsize @var{size}
Set video buffer verifier buffer size (in bits).
-@item -vcodec @var{codec}
+@item -vcodec @var{codec} (@emph{output})
Set the video codec. This is an alias for @code{-codec:v}.
@item -same_quant
Use same quantizer as source (implies VBR).
avconv -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
@end example
-@item -passlogfile @var{prefix}
+@item -passlogfile @var{prefix} (@emph{global})
Set two-pass log file name prefix to @var{prefix}, the default file name
prefix is ``av2pass''. The complete file name will be
@file{PREFIX-N.log}, where N is a number specific to the output
stream.
-@item -vf @var{filter_graph}
+@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).
+also sources and sinks). This is an alias for @code{-filter:v}.
@end table
@section Advanced Video Options
@table @option
-@item -pix_fmt @var{format}
+@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.
-@item -sws_flags @var{flags}
+@item -sws_flags @var{flags} (@emph{input/output})
Set SwScaler flags.
@item -g @var{gop_size}
Set the group of pictures size.
@item avgTex
@end table
-@item -rc_override @var{override}
+@item -rc_override[:@var{stream_specifier}] @var{override} (@emph{output,per-stream})
rate control override for specific intervals
@item -me_method @var{method}
Set motion estimation method to @var{method}.
exhaustive search (slow and marginally better than epzs)
@end table
-@item -dct_algo @var{algo}
-Set DCT algorithm to @var{algo}. Available values are:
-@table @samp
-@item 0
-FF_DCT_AUTO (default)
-@item 1
-FF_DCT_FASTINT
-@item 2
-FF_DCT_INT
-@item 3
-FF_DCT_MMX
-@item 4
-FF_DCT_MLIB
-@item 5
-FF_DCT_ALTIVEC
-@end table
-
-@item -idct_algo @var{algo}
-Set IDCT algorithm to @var{algo}. Available values are:
-@table @samp
-@item 0
-FF_IDCT_AUTO (default)
-@item 1
-FF_IDCT_INT
-@item 2
-FF_IDCT_SIMPLE
-@item 3
-FF_IDCT_SIMPLEMMX
-@item 4
-FF_IDCT_LIBMPEG2MMX
-@item 5
-FF_IDCT_PS2
-@item 6
-FF_IDCT_MLIB
-@item 7
-FF_IDCT_ARM
-@item 8
-FF_IDCT_ALTIVEC
-@item 9
-FF_IDCT_SH4
-@item 10
-FF_IDCT_SIMPLEARM
-@end table
-
@item -er @var{n}
Set error resilience to @var{n}.
@table @samp
FF_MB_DECISION_RD: rate distortion
@end table
-@item -4mv
-Use four motion vector by macroblock (MPEG-4 only).
-@item -part
-Use data partitioning (MPEG-4 only).
@item -bug @var{param}
Work around encoder bugs that are not auto-detected.
@item -strict @var{strictness}
How strictly to follow the standards.
-@item -aic
-Enable Advanced intra coding (h263+).
-@item -umv
-Enable Unlimited Motion Vector (h263+)
@item -deinterlace
Deinterlace pictures.
-@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.
+This option is deprecated since the deinterlacing is very low quality.
+Use the yadif filter with @code{-filter:v yadif}.
@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{n}
+@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}
+@item -vtag @var{fourcc/tag} (@emph{output})
Force video tag/fourcc. This is an alias for @code{-tag:v}.
-@item -qphist
+@item -qphist (@emph{global})
Show QP histogram.
-@item -force_key_frames @var{time}[,@var{time}...]
+@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}
+@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{freq}
+@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}
+@item -aq @var{q} (@emph{output})
Set the audio quality (codec-specific, VBR). This is an alias for -q:a.
-@item -ac @var{channels}
+@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
+@item -an (@emph{output})
Disable audio recording.
-@item -acodec @var{codec}
+@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}
-Set the audio sample format. Use @code{-help sample_fmts} to get a list
+@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.
@end table
@section Advanced Audio options:
@table @option
-@item -atag @var{fourcc/tag}
+@item -atag @var{fourcc/tag} (@emph{output})
Force audio tag/fourcc. This is an alias for @code{-tag:a}.
@item -audio_service_type @var{type}
Set the type of service that the audio stream contains.
@section Subtitle options:
@table @option
-@item -scodec @var{codec}
+@item -scodec @var{codec} (@emph{input/output})
Set the subtitle codec. This is an alias for @code{-codec:s}.
-@item -sn
+@item -sn (@emph{output})
Disable subtitle recording.
@end table
@section Audio/Video grab options
@table @option
-@item -isync
+@item -isync (@emph{global})
Synchronize read on input.
@end table
@section Advanced options
@table @option
-@item -map [-]@var{input_file_id}[:@var{input_stream_type}][:@var{input_stream_id}][,@var{sync_file_id}[:@var{sync_stream_type}][:@var{sync_stream_id}]]
+@item -map [-]@var{input_file_id}[:@var{stream_specifier}][,@var{sync_file_id}[:@var{stream_specifier}]] (@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{sync_stream_id} sets which input stream
+@var{sync_file_id}:@var{stream_specifier} sets which input stream
is used as a presentation sync reference.
-If @var{input_stream_type} is specified -- 'v' for video, 'a' for audio, 's' for
-subtitle and 'd' for data -- then @var{input_stream_id} counts only the streams
-of this type. Same for @var{sync_stream_type}.
-
-@var{input_stream_id} may be omitted, in which case all streams of the given
-type are mapped (or all streams in the file, if no type is specified).
-
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.
Note that using this option disables the default mappings for this output file.
-@item -map_metadata[:@var{metadata_type}][:@var{index}] @var{infile}[:@var{metadata_type}][:@var{index}]
+@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_type} parameters specify, which metadata to copy - (g)lobal
-(i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
-per-(p)rogram. All metadata specifiers other than global must be followed by the
-stream/chapter/program index. If metadata specifier is omitted, it defaults to
-global.
+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
@example
avconv -i in.ogg -map_metadata 0:s:0 out.mp3
@end example
-@item -map_chapters @var{input_file_index}
+
+To do the reverse, i.e. copy global metadata to all audio streams:
+@example
+avconv -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 -debug
Print specific debug info.
-@item -benchmark
+@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 -dump
-Dump each input packet.
-@item -hex
+@item -timelimit @var{duration} (@emph{global})
+Exit after avconv 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 -bitexact
-Only use bit exact algorithms (for codec testing).
@item -ps @var{size}
Set RTP payload size in bytes.
-@item -re
+@item -re (@emph{input})
Read input at native frame rate. Mainly used to simulate a grab device.
@item -threads @var{count}
Thread count.
Video sync method.
@table @option
-@item 0
+@item passthrough
Each frame is passed with its timestamp from the demuxer to the muxer.
-@item 1
+@item cfr
Frames will be duplicated and dropped to achieve exactly the requested
constant framerate.
-@item 2
+@item vfr
Frames are passed through with their timestamp or dropped so as to
prevent 2 frames from having the same timestamp.
-@item -1
+@item auto
Chooses between 1 and 2 depending on muxer capabilities. This is the
default method.
@end table
Finish encoding when the shortest input stream ends.
@item -dts_delta_threshold
Timestamp discontinuity delta threshold.
-@item -muxdelay @var{seconds}
+@item -muxdelay @var{seconds} (@emph{input})
Set the maximum demux-decode delay.
-@item -muxpreload @var{seconds}
+@item -muxpreload @var{seconds} (@emph{input})
Set the initial demux-decode delay.
-@item -streamid @var{output-stream-index}:@var{new-value}
+@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
avconv -i infile -streamid 0:33 -streamid 1:36 out.ts
@end example
-@item -bsf[:@var{stream_specifier}] @var{bitstream_filters}
+@item -bsf[:@var{stream_specifier}] @var{bitstream_filters} (@emph{output,per-stream})
Set bitstream filters for matching streams. @var{bistream_filters} is
a comma-separated list of bitstream filters. Use the @code{-bsfs} option
to get the list of bitstream filters.
@example
-avconv -i h264.mp4 -c:v copy -vbsf h264_mp4toannexb -an out.h264
+avconv -i h264.mp4 -c:v copy -bsf:v h264_mp4toannexb -an out.h264
@end example
@example
-avconv -i file.mov -an -vn -sbsf mov2textsub -c:s copy -f rawvideo sub.txt
+avconv -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}
+@item -tag[:@var{stream_specifier}] @var{codec_tag} (@emph{output,per-stream})
Force a tag/fourcc for matching streams.
+
+@item -cpuflags mask (@emph{global})
+Set a mask that's applied to autodetected CPU flags. This option is intended
+for testing. Do not use it unless you know what you're doing.
@end table
@c man end OPTIONS
@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 Libav source tree for examples.
+
+Preset files are specified with the @code{pre} option, this option takes a
+preset name as input. Avconv searches for a file named @var{preset_name}.avpreset in
+the directories @file{$AVCONV_DATADIR} (if set), and @file{$HOME/.avconv}, and in
+the data directory defined at configuration time (usually @file{$PREFIX/share/avconv})
+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 avconv can grab video
@settitle avconv video converter
@c man begin SEEALSO
-avplay(1), avprobe(1), avserver(1) and the Libav HTML documentation
+avplay(1), avprobe(1) and the Libav HTML documentation
@c man end
@c man begin AUTHORS
projects / ffmpeg / blobdiff