@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 Detailed description
+@c man begin DETAILED DESCRIPTION
+
+The transcoding process in @command{avconv} 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{avconv} 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{avconv} 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{avconv} can process raw audio and video frames using
+filters from the libavfilter library. Several chained filters form a filter
+graph. @command{avconv} 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{avconv} 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 av tries to pick the "best" stream of each type present in input
+By default avconv tries to pick the "best" stream of each type present in input
files and add them to each output file. For video, this means the highest
resolution, for audio the highest channel count. For subtitle it's simply the
first subtitle stream.
@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.
-This option affects all the input files that follow it.
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 @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
+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
avconv -i in.avi -metadata title="my title" out.flv
@end example
-@item -v @var{number}
-Set the logging verbosity level.
+To set the language of the first audio stream:
+@example
+avconv -i INPUT -metadata:s:a:0 language=eng OUTPUT
+@end example
-@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}
-Set the number of data frames to record.
+@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 -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
-@item -slang @var{code}
-Set the ISO 639 language code (3 letters) of the current subtitle stream.
+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}
-Set the number of video frames to record.
-@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).
-The following abbreviations are recognized:
+@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} (note that this actually causes the @code{fps} filter to be
+inserted to the end of the corresponding filtergraph).
+
+@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). The following
+abbreviations are recognized:
@table @samp
@item sqcif
128x96
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 -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
+@item -vn (@emph{output})
Disable video recording.
-@item -bt @var{tolerance}
-Set video bitrate tolerance (in bits, default 4000k).
-Has a minimum value of: (target_bitrate/target_framerate).
-In 1-pass mode, bitrate tolerance specifies how far ratecontrol is
-willing to deviate from the target average bitrate value. This is
-not related to min/max bitrate. Lowering tolerance too much has
-an adverse effect on quality.
-@item -maxrate @var{bitrate}
-Set max video bitrate (in bit/s).
-Requires -bufsize to be set.
-@item -minrate @var{bitrate}
-Set min video bitrate (in bit/s).
-Most useful in setting up a CBR encode:
-@example
-avconv -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
-@end example
-It is of little use elsewise.
-@item -bufsize @var{size}
-Set video buffer verifier buffer size (in bits).
-@item -vcodec @var{codec}
-Set the video codec. This is an alias for @code{-codec:v}.
-@item -same_quant
-Use same quantizer as source (implies VBR).
-Note that this is NOT SAME QUALITY. Do not use this option unless you know you
-need it.
+@item -vcodec @var{codec} (@emph{output})
+Set the video codec. This is an alias for @code{-codec:v}.
-@item -pass @var{n}
+@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),
avconv -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
@end example
-@item -passlogfile @var{prefix}
+@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 ``av2pass''. 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}
+@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}
-Set pixel format. Use 'list' as parameter to show all the supported
+@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 -vdt @var{n}
Discard threshold.
-@item -qscale @var{q}
-Use fixed video quantizer scale (VBR).
-@item -qmin @var{q}
-minimum video quantizer scale (VBR)
-@item -qmax @var{q}
-maximum video quantizer scale (VBR)
-@item -qdiff @var{q}
-maximum difference between the quantizer scales (VBR)
-@item -qblur @var{blur}
-video quantizer scale blur (VBR) (range 0.0 - 1.0)
-@item -qcomp @var{compression}
-video quantizer scale compression (VBR) (default 0.5).
-Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
-
-@item -lmin @var{lambda}
-minimum video lagrange factor (VBR)
-@item -lmax @var{lambda}
-max video lagrange factor (VBR)
-@item -mblmin @var{lambda}
-minimum macroblock quantizer scale (VBR)
-@item -mblmax @var{lambda}
-maximum macroblock quantizer scale (VBR)
-
-These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units,
-but you may use the QP2LAMBDA constant to easily convert from 'q' units:
-@example
-avconv -i src.ext -lmax 21*QP2LAMBDA dst.ext
-@end example
-@item -rc_init_cplx @var{complexity}
-initial complexity for single pass encoding
-@item -b_qfactor @var{factor}
-qp factor between P- and B-frames
-@item -i_qfactor @var{factor}
-qp factor between P- and I-frames
-@item -b_qoffset @var{offset}
-qp offset between P- and B-frames
-@item -i_qoffset @var{offset}
-qp offset between P- and I-frames
-@item -rc_eq @var{equation}
-Set rate control equation (see section "Expression Evaluation")
-(default = @code{tex^qComp}).
-
-When computing the rate control equation expression, besides the
-standard functions defined in the section "Expression Evaluation", the
-following functions are available:
-@table @var
-@item bits2qp(bits)
-@item qp2bits(qp)
-@end table
-
-and the following constants are available:
-@table @var
-@item iTex
-@item pTex
-@item tex
-@item mv
-@item fCode
-@item iCount
-@item mcVar
-@item var
-@item isI
-@item isP
-@item isB
-@item avgQP
-@item qComp
-@item avgIITex
-@item avgPITex
-@item avgPPTex
-@item avgBPTex
-@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}.
-Available methods are (from lowest to best quality):
-@table @samp
-@item zero
-Try just the (0, 0) vector.
-@item phods
-@item log
-@item x1
-@item hex
-@item umh
-@item epzs
-(default method)
-@item full
-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
-@item 1
-FF_ER_CAREFUL (default)
-@item 2
-FF_ER_COMPLIANT
-@item 3
-FF_ER_AGGRESSIVE
-@item 4
-FF_ER_VERY_AGGRESSIVE
-@end table
-
-@item -ec @var{bit_mask}
-Set error concealment to @var{bit_mask}. @var{bit_mask} is a bit mask of
-the following values:
-@table @samp
-@item 1
-FF_EC_GUESS_MVS (default = enabled)
-@item 2
-FF_EC_DEBLOCK (default = enabled)
-@end table
-
-@item -bf @var{frames}
-Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4).
-@item -mbd @var{mode}
-macroblock decision
-@table @samp
-@item 0
-FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in avconv).
-@item 1
-FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
-@item 2
-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.
-@item -psnr
-Calculate PSNR of compressed frames.
+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}
-Force video tag/fourcc.
-@item -qphist
+@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}
-Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
-@example
-avconv -i h264.mp4 -c:v copy -vbsf h264_mp4toannexb -an out.h264
-@end example
-@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}
-Set the number of audio frames to record.
-@item -ar @var{freq}
+@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}
-Set the audio quality (codec-specific, VBR).
-@item -ac @var{channels}
+@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
+@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 -alang @var{code}
-Set the ISO 639 language code (3 letters) of the current audio stream.
+@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}
-Force audio tag/fourcc.
-@item -audio_service_type @var{type}
-Set the type of service that the audio stream contains.
-@table @option
-@item ma
-Main Audio Service (default)
-@item ef
-Effects
-@item vi
-Visually Impaired
-@item hi
-Hearing Impaired
-@item di
-Dialogue
-@item co
-Commentary
-@item em
-Emergency
-@item vo
-Voice Over
-@item ka
-Karaoke
-@end table
-@item -absf @var{bitstream_filter}
-Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
+@item -atag @var{fourcc/tag} (@emph{output})
+Force audio tag/fourcc. This is an alias for @code{-tag:a}.
@end table
@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 -slang @var{code}
-Set the ISO 639 language code (3 letters) of the current subtitle stream.
-@item -sn
+@item -sn (@emph{output})
Disable subtitle recording.
-@item -sbsf @var{bitstream_filter}
-Bitstream filters available are "mov2textsub", "text2movsub".
-@example
-avconv -i file.mov -an -vn -sbsf mov2textsub -c:s copy -f rawvideo sub.txt
-@end example
-@end table
-
-@section Audio/Video grab options
-
-@table @option
-@item -isync
-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}]] | @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{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.
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
-av -i INPUT -map 0 output
+avconv -i INPUT -map 0 output
@end example
For example, if you have two audio streams in the first input file,
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.
@item -vsync @var{parameter}
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
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{asyncts} audio filter instead.
@item -copyts
Copy timestamps from input to output.
@item -copytb
Copy input stream time base from input to output when stream copying.
-@item -shortest
+@item -shortest (@emph{output})
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
@example
avconv -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{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 -bsf:v h264_mp4toannexb -an out.h264
+@end example
+@example
+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} (@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.
+
+@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 @ref{Filtergraph syntax}.
+
+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
+avconv -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
+avconv -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
+avconv -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
+avconv -filter_complex 'color=red' -t 5 out.mkv
+@end example
@end table
@c man end OPTIONS
@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 '-intra' to disable
+'-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).
@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
The resulting output file @file{test12.avi} will contain first four streams from
the input file in reverse order.
+@item
+To force CBR video output:
+@example
+avconv -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
+avconv -i src.ext -lmax 21*QP2LAMBDA dst.ext
+@end example
+
@end itemize
@c man end EXAMPLES
@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