mirror of https://git.ffmpeg.org/ffmpeg.git
1051 lines
30 KiB
Plaintext
1051 lines
30 KiB
Plaintext
\input texinfo @c -*- texinfo -*-
|
|
|
|
@settitle avconv Documentation
|
|
@titlepage
|
|
@center @titlefont{avconv Documentation}
|
|
@end titlepage
|
|
|
|
@top
|
|
|
|
@contents
|
|
|
|
@chapter Synopsis
|
|
|
|
The generic syntax is:
|
|
|
|
@example
|
|
@c man begin SYNOPSIS
|
|
avconv [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{outfile}@}...
|
|
@c man end
|
|
@end example
|
|
|
|
@chapter Description
|
|
@c man begin DESCRIPTION
|
|
|
|
avconv 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.
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
@itemize
|
|
@item
|
|
To set the video bitrate of the output file to 64kbit/s:
|
|
@example
|
|
avconv -i input.avi -b 64k output.avi
|
|
@end example
|
|
|
|
@item
|
|
To force the frame rate of the output file to 24 fps:
|
|
@example
|
|
avconv -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
|
|
avconv -r 1 -i input.m2v -r 24 output.avi
|
|
@end example
|
|
@end itemize
|
|
|
|
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
|
|
@c man begin STREAM SELECTION
|
|
|
|
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.
|
|
|
|
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 fftools-common-opts.texi
|
|
|
|
@section Main options
|
|
|
|
@table @option
|
|
|
|
@item -f @var{fmt}
|
|
Force format.
|
|
|
|
@item -i @var{filename}
|
|
input file name
|
|
|
|
@item -y
|
|
Overwrite output files.
|
|
|
|
@item -c[:@var{stream_type}][:@var{stream_index}] @var{codec}
|
|
@item -codec[:@var{stream_type}][:@var{stream_index}] @var{codec}
|
|
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
|
|
@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
|
|
avconv -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}
|
|
Restrict the transcoded/captured video sequence
|
|
to the duration specified in seconds.
|
|
@code{hh:mm:ss[.xxx]} syntax is also supported.
|
|
|
|
@item -fs @var{limit_size}
|
|
Set the file size limit.
|
|
|
|
@item -ss @var{position}
|
|
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}
|
|
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.
|
|
|
|
@item -metadata @var{key}=@var{value}
|
|
Set a metadata key/value pair.
|
|
|
|
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.
|
|
|
|
@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:
|
|
|
|
@example
|
|
avconv -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
|
|
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 -slang @var{code}
|
|
Set the ISO 639 language code (3 letters) of the current subtitle stream.
|
|
|
|
@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} (ffserver default = 160x128, avconv default = same as source).
|
|
The following abbreviations are recognized:
|
|
@table @samp
|
|
@item sqcif
|
|
128x96
|
|
@item qcif
|
|
176x144
|
|
@item cif
|
|
352x288
|
|
@item 4cif
|
|
704x576
|
|
@item 16cif
|
|
1408x1152
|
|
@item qqvga
|
|
160x120
|
|
@item qvga
|
|
320x240
|
|
@item vga
|
|
640x480
|
|
@item svga
|
|
800x600
|
|
@item xga
|
|
1024x768
|
|
@item uxga
|
|
1600x1200
|
|
@item qxga
|
|
2048x1536
|
|
@item sxga
|
|
1280x1024
|
|
@item qsxga
|
|
2560x2048
|
|
@item hsxga
|
|
5120x4096
|
|
@item wvga
|
|
852x480
|
|
@item wxga
|
|
1366x768
|
|
@item wsxga
|
|
1600x1024
|
|
@item wuxga
|
|
1920x1200
|
|
@item woxga
|
|
2560x1600
|
|
@item wqsxga
|
|
3200x2048
|
|
@item wquxga
|
|
3840x2400
|
|
@item whsxga
|
|
6400x4096
|
|
@item whuxga
|
|
7680x4800
|
|
@item cga
|
|
320x200
|
|
@item ega
|
|
640x350
|
|
@item hd480
|
|
852x480
|
|
@item hd720
|
|
1280x720
|
|
@item hd1080
|
|
1920x1080
|
|
@end table
|
|
|
|
@item -aspect @var{aspect}
|
|
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
|
|
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 -pass @var{n}
|
|
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
|
|
avconv -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
|
|
avconv -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y /dev/null
|
|
@end example
|
|
|
|
@item -passlogfile @var{prefix}
|
|
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}
|
|
@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).
|
|
|
|
@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
|
|
pixel formats.
|
|
@item -sws_flags @var{flags}
|
|
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}
|
|
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.
|
|
@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}
|
|
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
|
|
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}...]
|
|
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.
|
|
@end table
|
|
|
|
@section Audio Options
|
|
|
|
@table @option
|
|
@item -aframes @var{number}
|
|
Set the number of audio frames to record.
|
|
@item -ar @var{freq}
|
|
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}
|
|
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
|
|
Disable audio recording.
|
|
@item -acodec @var{codec}
|
|
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.
|
|
@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".
|
|
@end table
|
|
|
|
@section Subtitle options:
|
|
|
|
@table @option
|
|
@item -scodec @var{codec}
|
|
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
|
|
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}]]
|
|
|
|
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
|
|
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.
|
|
|
|
For example, to map ALL streams from the first input file to output
|
|
@example
|
|
avconv -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
|
|
avconv -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
|
|
avconv -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
|
|
avconv -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
|
|
avconv -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_metadata[:@var{metadata_type}][:@var{index}] @var{infile}[:@var{metadata_type}][:@var{index}]
|
|
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.
|
|
|
|
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
|
|
avconv -i in.ogg -map_metadata 0:s:0 out.mp3
|
|
@end example
|
|
@item -map_chapters @var{input_file_index}
|
|
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
|
|
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
|
|
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
|
|
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
|
|
Each frame is passed with its timestamp from the demuxer to the muxer.
|
|
@item 1
|
|
Frames will be duplicated and dropped to achieve exactly the requested
|
|
constant framerate.
|
|
@item 2
|
|
Frames are passed through with their timestamp or dropped so as to
|
|
prevent 2 frames from having the same timestamp.
|
|
@item -1
|
|
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.
|
|
@item -copyts
|
|
Copy timestamps from input to output.
|
|
@item -copytb
|
|
Copy input stream time base from input to output when stream copying.
|
|
@item -shortest
|
|
Finish encoding when the shortest input stream ends.
|
|
@item -dts_delta_threshold
|
|
Timestamp discontinuity delta threshold.
|
|
@item -muxdelay @var{seconds}
|
|
Set the maximum demux-decode delay.
|
|
@item -muxpreload @var{seconds}
|
|
Set the initial demux-decode delay.
|
|
@item -streamid @var{output-stream-index}:@var{new-value}
|
|
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
|
|
avconv -i infile -streamid 0:33 -streamid 1:36 out.ts
|
|
@end example
|
|
@end table
|
|
@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
|
|
avconv -g 3 -r 3 -t 10 -b 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 '-intra' 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 Video and Audio grabbing
|
|
|
|
If you specify the input format and device then avconv can grab video
|
|
and audio directly.
|
|
|
|
@example
|
|
avconv -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
|
|
@end example
|
|
|
|
Note that you must activate the right video source and channel before
|
|
launching avconv 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 avconv via
|
|
|
|
@example
|
|
avconv -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
|
|
avconv -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 avconv:
|
|
|
|
Examples:
|
|
@itemize
|
|
@item
|
|
You can use YUV files as input:
|
|
|
|
@example
|
|
avconv -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 avconv cannot guess it.
|
|
|
|
@item
|
|
You can input from a raw YUV420P file:
|
|
|
|
@example
|
|
avconv -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
|
|
avconv -i mydivx.avi hugefile.yuv
|
|
@end example
|
|
|
|
@item
|
|
You can set several input files and output files:
|
|
|
|
@example
|
|
avconv -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
|
|
avconv -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
|
|
avconv -i /tmp/a.wav -map 0:a -b 64k /tmp/a.mp2 -map 0:a -b 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
|
|
avconv -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{avconv -formats}.
|
|
|
|
@item
|
|
You can extract images from a video, or create a video from many images:
|
|
|
|
For extracting images from a video:
|
|
@example
|
|
avconv -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
|
|
avconv -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.
|
|
|
|
@item
|
|
You can put many streams of the same type in the output:
|
|
|
|
@example
|
|
avconv -i test1.avi -i test2.avi -map 0.3 -map 0.2 -map 0.1 -map 0.0 -c copy test12.nut
|
|
@end example
|
|
|
|
The resulting output file @file{test12.avi} will contain first four streams from
|
|
the input file in reverse order.
|
|
|
|
@end itemize
|
|
@c man end EXAMPLES
|
|
|
|
@include eval.texi
|
|
@include encoders.texi
|
|
@include demuxers.texi
|
|
@include muxers.texi
|
|
@include indevs.texi
|
|
@include outdevs.texi
|
|
@include protocols.texi
|
|
@include bitstream_filters.texi
|
|
@include filters.texi
|
|
@include metadata.texi
|
|
|
|
@ignore
|
|
|
|
@setfilename avconv
|
|
@settitle avconv video converter
|
|
|
|
@c man begin SEEALSO
|
|
ffplay(1), ffprobe(1), ffserver(1) and the FFmpeg HTML documentation
|
|
@c man end
|
|
|
|
@c man begin AUTHORS
|
|
The Libav developers
|
|
@c man end
|
|
|
|
@end ignore
|
|
|
|
@bye
|