6291d7e416
It will be further developed with a few incompatible changes. ffmpeg.c will stay as is for some time, so any scripts using it won't be broken.
1066 lines
31 KiB
Plaintext
1066 lines
31 KiB
Plaintext
\input texinfo @c -*- texinfo -*-
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@settitle avconv Documentation
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@titlepage
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@center @titlefont{avconv Documentation}
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@end titlepage
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@top
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@contents
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@chapter Synopsis
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The generic syntax is:
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@example
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@c man begin SYNOPSIS
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avconv [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{outfile}@}...
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@c man end
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@end example
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@chapter Description
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@c man begin DESCRIPTION
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avconv is a very fast video and audio converter that can also grab from
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a live audio/video source. It can also convert between arbitrary sample
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rates and resize video on the fly with a high quality polyphase filter.
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The command line interface is designed to be intuitive, in the sense
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that avconv tries to figure out all parameters that can possibly be
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derived automatically. You usually only have to specify the target
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bitrate you want.
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As a general rule, options are applied to the next specified
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file. Therefore, order is important, and you can have the same
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option on the command line multiple times. Each occurrence is
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then applied to the next input or output file.
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@itemize
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@item
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To set the video bitrate of the output file to 64kbit/s:
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@example
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avconv -i input.avi -b 64k output.avi
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@end example
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@item
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To force the frame rate of the output file to 24 fps:
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@example
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avconv -i input.avi -r 24 output.avi
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@end example
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@item
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To force the frame rate of the input file (valid for raw formats only)
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to 1 fps and the frame rate of the output file to 24 fps:
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@example
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avconv -r 1 -i input.m2v -r 24 output.avi
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@end example
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@end itemize
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The format option may be needed for raw input files.
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By default avconv tries to convert as losslessly as possible: It
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uses the same audio and video parameters for the outputs as the one
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specified for the inputs.
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@c man end DESCRIPTION
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@chapter Options
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@c man begin OPTIONS
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@include fftools-common-opts.texi
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@section Main options
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@table @option
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@item -f @var{fmt}
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Force format.
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@item -i @var{filename}
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input file name
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@item -y
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Overwrite output files.
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@item -t @var{duration}
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Restrict the transcoded/captured video sequence
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to the duration specified in seconds.
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@code{hh:mm:ss[.xxx]} syntax is also supported.
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@item -fs @var{limit_size}
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Set the file size limit.
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@item -ss @var{position}
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Seek to given time position in seconds.
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@code{hh:mm:ss[.xxx]} syntax is also supported.
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@item -itsoffset @var{offset}
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Set the input time offset in seconds.
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@code{[-]hh:mm:ss[.xxx]} syntax is also supported.
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This option affects all the input files that follow it.
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The offset is added to the timestamps of the input files.
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Specifying a positive offset means that the corresponding
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streams are delayed by 'offset' seconds.
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@item -timestamp @var{time}
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Set the recording timestamp in the container.
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The syntax for @var{time} is:
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@example
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now|([(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH[:MM[:SS[.m...]]])|(HH[MM[SS[.m...]]]))[Z|z])
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@end example
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If the value is "now" it takes the current time.
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Time is local time unless 'Z' or 'z' is appended, in which case it is
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interpreted as UTC.
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If the year-month-day part is not specified it takes the current
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year-month-day.
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@item -metadata @var{key}=@var{value}
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Set a metadata key/value pair.
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For example, for setting the title in the output file:
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@example
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avconv -i in.avi -metadata title="my title" out.flv
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@end example
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@item -v @var{number}
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Set the logging verbosity level.
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@item -target @var{type}
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Specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd",
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"ntsc-svcd", ... ). All the format options (bitrate, codecs,
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buffer sizes) are then set automatically. You can just type:
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@example
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avconv -i myfile.avi -target vcd /tmp/vcd.mpg
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@end example
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Nevertheless you can specify additional options as long as you know
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they do not conflict with the standard, as in:
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@example
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avconv -i myfile.avi -target vcd -bf 2 /tmp/vcd.mpg
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@end example
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@item -dframes @var{number}
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Set the number of data frames to record.
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@item -scodec @var{codec}
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Force subtitle codec ('copy' to copy stream).
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@item -newsubtitle
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Add a new subtitle stream to the current output stream.
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@item -slang @var{code}
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Set the ISO 639 language code (3 letters) of the current subtitle stream.
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@end table
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@section Video Options
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@table @option
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@item -vframes @var{number}
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Set the number of video frames to record.
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@item -r @var{fps}
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Set frame rate (Hz value, fraction or abbreviation), (default = 25).
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@item -s @var{size}
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Set frame size. The format is @samp{wxh} (avserver default = 160x128, avconv default = same as source).
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The following abbreviations are recognized:
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@table @samp
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@item sqcif
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128x96
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@item qcif
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176x144
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@item cif
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352x288
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@item 4cif
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704x576
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@item 16cif
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1408x1152
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@item qqvga
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160x120
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@item qvga
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320x240
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@item vga
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640x480
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@item svga
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800x600
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@item xga
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1024x768
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@item uxga
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1600x1200
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@item qxga
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2048x1536
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@item sxga
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1280x1024
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@item qsxga
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2560x2048
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@item hsxga
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5120x4096
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@item wvga
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852x480
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@item wxga
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1366x768
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@item wsxga
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1600x1024
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@item wuxga
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1920x1200
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@item woxga
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2560x1600
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@item wqsxga
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3200x2048
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@item wquxga
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3840x2400
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@item whsxga
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6400x4096
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@item whuxga
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7680x4800
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@item cga
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320x200
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@item ega
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640x350
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@item hd480
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852x480
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@item hd720
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1280x720
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@item hd1080
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1920x1080
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@end table
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@item -aspect @var{aspect}
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Set the video display aspect ratio specified by @var{aspect}.
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@var{aspect} can be a floating point number string, or a string of the
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form @var{num}:@var{den}, where @var{num} and @var{den} are the
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numerator and denominator of the aspect ratio. For example "4:3",
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"16:9", "1.3333", and "1.7777" are valid argument values.
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@item -croptop @var{size}
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@item -cropbottom @var{size}
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@item -cropleft @var{size}
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@item -cropright @var{size}
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All the crop options have been removed. Use -vf
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crop=width:height:x:y instead.
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@item -padtop @var{size}
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@item -padbottom @var{size}
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@item -padleft @var{size}
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@item -padright @var{size}
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@item -padcolor @var{hex_color}
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All the pad options have been removed. Use -vf
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pad=width:height:x:y:color instead.
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@item -vn
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Disable video recording.
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@item -bt @var{tolerance}
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Set video bitrate tolerance (in bits, default 4000k).
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Has a minimum value of: (target_bitrate/target_framerate).
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In 1-pass mode, bitrate tolerance specifies how far ratecontrol is
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willing to deviate from the target average bitrate value. This is
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not related to min/max bitrate. Lowering tolerance too much has
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an adverse effect on quality.
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@item -maxrate @var{bitrate}
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Set max video bitrate (in bit/s).
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Requires -bufsize to be set.
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@item -minrate @var{bitrate}
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Set min video bitrate (in bit/s).
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Most useful in setting up a CBR encode:
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@example
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avconv -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m2v
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@end example
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It is of little use elsewise.
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@item -bufsize @var{size}
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Set video buffer verifier buffer size (in bits).
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@item -vcodec @var{codec}
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Force video codec to @var{codec}. Use the @code{copy} special value to
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tell that the raw codec data must be copied as is.
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@item -sameq
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Use same quantizer as source (implies VBR).
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@item -pass @var{n}
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Select the pass number (1 or 2). It is used to do two-pass
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video encoding. The statistics of the video are recorded in the first
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pass into a log file (see also the option -passlogfile),
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and in the second pass that log file is used to generate the video
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at the exact requested bitrate.
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On pass 1, you may just deactivate audio and set output to null,
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examples for Windows and Unix:
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@example
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avconv -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y NUL
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avconv -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y /dev/null
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@end example
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@item -passlogfile @var{prefix}
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Set two-pass log file name prefix to @var{prefix}, the default file name
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prefix is ``av2pass''. The complete file name will be
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@file{PREFIX-N.log}, where N is a number specific to the output
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stream.
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@item -newvideo
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Add a new video stream to the current output stream.
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@item -vlang @var{code}
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Set the ISO 639 language code (3 letters) of the current video stream.
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@item -vf @var{filter_graph}
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@var{filter_graph} is a description of the filter graph to apply to
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the input video.
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Use the option "-filters" to show all the available filters (including
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also sources and sinks).
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@end table
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@section Advanced Video Options
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@table @option
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@item -pix_fmt @var{format}
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Set pixel format. Use 'list' as parameter to show all the supported
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pixel formats.
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@item -sws_flags @var{flags}
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Set SwScaler flags.
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@item -g @var{gop_size}
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Set the group of pictures size.
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@item -intra
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Use only intra frames.
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@item -vdt @var{n}
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Discard threshold.
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@item -qscale @var{q}
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Use fixed video quantizer scale (VBR).
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@item -qmin @var{q}
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minimum video quantizer scale (VBR)
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@item -qmax @var{q}
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maximum video quantizer scale (VBR)
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@item -qdiff @var{q}
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maximum difference between the quantizer scales (VBR)
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@item -qblur @var{blur}
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video quantizer scale blur (VBR) (range 0.0 - 1.0)
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@item -qcomp @var{compression}
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video quantizer scale compression (VBR) (default 0.5).
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Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
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@item -lmin @var{lambda}
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minimum video lagrange factor (VBR)
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@item -lmax @var{lambda}
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max video lagrange factor (VBR)
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@item -mblmin @var{lambda}
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minimum macroblock quantizer scale (VBR)
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@item -mblmax @var{lambda}
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maximum macroblock quantizer scale (VBR)
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These four options (lmin, lmax, mblmin, mblmax) use 'lambda' units,
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but you may use the QP2LAMBDA constant to easily convert from 'q' units:
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@example
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avconv -i src.ext -lmax 21*QP2LAMBDA dst.ext
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@end example
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@item -rc_init_cplx @var{complexity}
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initial complexity for single pass encoding
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@item -b_qfactor @var{factor}
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qp factor between P- and B-frames
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@item -i_qfactor @var{factor}
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qp factor between P- and I-frames
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@item -b_qoffset @var{offset}
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qp offset between P- and B-frames
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@item -i_qoffset @var{offset}
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qp offset between P- and I-frames
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@item -rc_eq @var{equation}
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Set rate control equation (see section "Expression Evaluation")
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(default = @code{tex^qComp}).
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When computing the rate control equation expression, besides the
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standard functions defined in the section "Expression Evaluation", the
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following functions are available:
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@table @var
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@item bits2qp(bits)
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@item qp2bits(qp)
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@end table
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and the following constants are available:
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@table @var
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@item iTex
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@item pTex
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@item tex
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@item mv
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@item fCode
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@item iCount
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@item mcVar
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@item var
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@item isI
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@item isP
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@item isB
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@item avgQP
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@item qComp
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@item avgIITex
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@item avgPITex
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@item avgPPTex
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@item avgBPTex
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@item avgTex
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@end table
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@item -rc_override @var{override}
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rate control override for specific intervals
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@item -me_method @var{method}
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Set motion estimation method to @var{method}.
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Available methods are (from lowest to best quality):
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@table @samp
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@item zero
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Try just the (0, 0) vector.
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@item phods
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@item log
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@item x1
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@item hex
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@item umh
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@item epzs
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(default method)
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@item full
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exhaustive search (slow and marginally better than epzs)
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@end table
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@item -dct_algo @var{algo}
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Set DCT algorithm to @var{algo}. Available values are:
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@table @samp
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@item 0
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FF_DCT_AUTO (default)
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@item 1
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FF_DCT_FASTINT
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@item 2
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FF_DCT_INT
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@item 3
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FF_DCT_MMX
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@item 4
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FF_DCT_MLIB
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@item 5
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FF_DCT_ALTIVEC
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@end table
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@item -idct_algo @var{algo}
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Set IDCT algorithm to @var{algo}. Available values are:
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@table @samp
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@item 0
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FF_IDCT_AUTO (default)
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@item 1
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FF_IDCT_INT
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@item 2
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FF_IDCT_SIMPLE
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@item 3
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FF_IDCT_SIMPLEMMX
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@item 4
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FF_IDCT_LIBMPEG2MMX
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@item 5
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FF_IDCT_PS2
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@item 6
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FF_IDCT_MLIB
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@item 7
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FF_IDCT_ARM
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@item 8
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FF_IDCT_ALTIVEC
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@item 9
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FF_IDCT_SH4
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@item 10
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FF_IDCT_SIMPLEARM
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@end table
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@item -er @var{n}
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Set error resilience to @var{n}.
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@table @samp
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@item 1
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FF_ER_CAREFUL (default)
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@item 2
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FF_ER_COMPLIANT
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@item 3
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FF_ER_AGGRESSIVE
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@item 4
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FF_ER_VERY_AGGRESSIVE
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@end table
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@item -ec @var{bit_mask}
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Set error concealment to @var{bit_mask}. @var{bit_mask} is a bit mask of
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the following values:
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@table @samp
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@item 1
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FF_EC_GUESS_MVS (default = enabled)
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@item 2
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FF_EC_DEBLOCK (default = enabled)
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@end table
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@item -bf @var{frames}
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Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4).
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@item -mbd @var{mode}
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macroblock decision
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@table @samp
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@item 0
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FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in avconv).
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@item 1
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FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
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@item 2
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FF_MB_DECISION_RD: rate distortion
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@end table
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@item -4mv
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Use four motion vector by macroblock (MPEG-4 only).
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@item -part
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Use data partitioning (MPEG-4 only).
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@item -bug @var{param}
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Work around encoder bugs that are not auto-detected.
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@item -strict @var{strictness}
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How strictly to follow the standards.
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@item -aic
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Enable Advanced intra coding (h263+).
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@item -umv
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Enable Unlimited Motion Vector (h263+)
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@item -deinterlace
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Deinterlace pictures.
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@item -ilme
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Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
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Use this option if your input file is interlaced and you want
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to keep the interlaced format for minimum losses.
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The alternative is to deinterlace the input stream with
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@option{-deinterlace}, but deinterlacing introduces losses.
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@item -psnr
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Calculate PSNR of compressed frames.
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@item -vstats
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Dump video coding statistics to @file{vstats_HHMMSS.log}.
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@item -vstats_file @var{file}
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Dump video coding statistics to @var{file}.
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@item -top @var{n}
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top=1/bottom=0/auto=-1 field first
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@item -dc @var{precision}
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Intra_dc_precision.
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@item -vtag @var{fourcc/tag}
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Force video tag/fourcc.
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@item -qphist
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Show QP histogram.
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@item -vbsf @var{bitstream_filter}
|
|
Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
|
|
@example
|
|
avconv -i h264.mp4 -vcodec 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}
|
|
Force audio codec to @var{codec}. Use the @code{copy} special value to
|
|
specify that the raw codec data must be copied as is.
|
|
@item -newaudio
|
|
Add a new audio track to the output file. If you want to specify parameters,
|
|
do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..).
|
|
|
|
Mapping will be done automatically, if the number of output streams is equal to
|
|
the number of input streams, else it will pick the first one that matches. You
|
|
can override the mapping using @code{-map} as usual.
|
|
|
|
Example:
|
|
@example
|
|
avconv -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio
|
|
@end example
|
|
@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}
|
|
Force subtitle codec ('copy' to copy stream).
|
|
@item -newsubtitle
|
|
Add a new subtitle stream to the current output stream.
|
|
@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 -scodec copy -f rawvideo sub.txt
|
|
@end example
|
|
@end table
|
|
|
|
@section Audio/Video grab options
|
|
|
|
@table @option
|
|
@item -vc @var{channel}
|
|
Set video grab channel (DV1394 only).
|
|
@item -tvstd @var{standard}
|
|
Set television standard (NTSC, PAL (SECAM)).
|
|
@item -isync
|
|
Synchronize read on input.
|
|
@end table
|
|
|
|
@section Advanced options
|
|
|
|
@table @option
|
|
@item -map @var{input_file_id}.@var{input_stream_id}[:@var{sync_file_id}.@var{sync_stream_id}]
|
|
|
|
Designate an input stream 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 indexes start at 0. If specified,
|
|
@var{sync_file_id}.@var{sync_stream_id} sets which input stream
|
|
is used as a presentation sync reference.
|
|
|
|
The @code{-map} options must be specified just after the output file.
|
|
If any @code{-map} options are used, the number of @code{-map} options
|
|
on the command line must match the number of streams in the output
|
|
file. 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.
|
|
|
|
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 stream to place in an output file. For
|
|
example:
|
|
@example
|
|
avconv -i INPUT out.wav -map 0.1
|
|
@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 -vcodec copy -acodec copy out.mov -map 0.2 -map 1.6
|
|
@end example
|
|
|
|
To add more streams to the output file, you can use the
|
|
@code{-newaudio}, @code{-newvideo}, @code{-newsubtitle} options.
|
|
|
|
@item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
|
|
Deprecated, use @var{-map_metadata} instead.
|
|
|
|
@item -map_metadata @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
|
|
Set metadata information of @var{outfile} from @var{infile}. Note that those
|
|
are file indices (zero-based), not filenames.
|
|
Optional @var{metadata} 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 number. If metadata specifier is omitted, it defaults to
|
|
global.
|
|
|
|
By default, global metadata is copied from the first input file to all output files,
|
|
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 0:0,s0 out.mp3
|
|
@end example
|
|
@item -map_chapters @var{outfile}:@var{infile}
|
|
Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
|
|
then chapters are copied from the first input file with at least one chapter to all
|
|
output files. 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 -loop_input
|
|
Loop over the input stream. Currently it works only for image
|
|
streams. This option is used for automatic AVserver testing.
|
|
This option is deprecated, use -loop.
|
|
@item -loop_output @var{number_of_times}
|
|
Repeatedly loop output for formats that support looping such as animated GIF
|
|
(0 will loop the output infinitely).
|
|
This option is deprecated, use -loop.
|
|
@item -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
|
|
|
|
@section Preset files
|
|
|
|
A preset file contains a sequence of @var{option}=@var{value} pairs,
|
|
one for each line, specifying a sequence of options which would be
|
|
awkward to specify on the command line. Lines starting with the hash
|
|
('#') character are ignored and are used to provide comments. Check
|
|
the @file{ffpresets} directory in the Libav source tree for examples.
|
|
|
|
Preset files are specified with the @code{vpre}, @code{apre},
|
|
@code{spre}, and @code{fpre} options. The @code{fpre} option takes the
|
|
filename of the preset instead of a preset name as input and can be
|
|
used for any kind of codec. For the @code{vpre}, @code{apre}, and
|
|
@code{spre} options, the options specified in a preset file are
|
|
applied to the currently selected codec of the same type as the preset
|
|
option.
|
|
|
|
The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
|
|
preset options identifies the preset file to use according to the
|
|
following rules:
|
|
|
|
First avconv searches for a file named @var{arg}.ffpreset in the
|
|
directories @file{$av_DATADIR} (if set), and @file{$HOME/.avconv}, and in
|
|
the datadir 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.ffpreset}.
|
|
|
|
If no such file is found, then avconv will search for a file named
|
|
@var{codec_name}-@var{arg}.ffpreset in the above-mentioned
|
|
directories, where @var{codec_name} is the name of the codec to which
|
|
the preset file options will be applied. For example, if you select
|
|
the video codec with @code{-vcodec libx264} and use @code{-vpre max},
|
|
then it will search for the file @file{libx264-max.ffpreset}.
|
|
@c man end
|
|
|
|
@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).
|
|
|
|
@item
|
|
When converting video files, you can use the '-sameq' option which
|
|
uses the same quality factor in the encoder as in the decoder.
|
|
It allows almost lossless encoding.
|
|
|
|
@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 -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
|
|
@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 -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 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 -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
|
|
@end example
|
|
|
|
In addition to the first video and audio streams, the resulting
|
|
output file @file{test12.avi} will contain the second video
|
|
and the second audio stream found in the input streams list.
|
|
|
|
The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
|
|
options have to be specified immediately after the name of the output
|
|
file to which you want to add them.
|
|
|
|
@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
|
|
avplay(1), avprobe(1), avserver(1) and the Libav HTML documentation
|
|
@c man end
|
|
|
|
@c man begin AUTHORS
|
|
The Libav developers
|
|
@c man end
|
|
|
|
@end ignore
|
|
|
|
@bye
|