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\input texinfo @c -*- texinfo -*-
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@settitle FFmpeg Documentation
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@titlepage
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@center @titlefont{FFmpeg 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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ffmpeg [[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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FFmpeg is a very fast video and audio converter. It can also grab from
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a live audio/video source.
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The command line interface is designed to be intuitive, in the sense
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that FFmpeg 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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FFmpeg can also convert from any sample rate to any other, and resize
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video on the fly with a high quality polyphase filter.
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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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ffmpeg -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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ffmpeg -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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ffmpeg -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, FFmpeg 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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ffmpeg -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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ffmpeg -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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ffmpeg -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 -b @var{bitrate}
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Set the video bitrate in bit/s (default = 200 kb/s).
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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} (ffserver default = 160x128).
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There is no default for input streams,
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for output streams it is set by default to the size of the source stream.
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If the input file has video streams with different resolutions, the behaviour is undefined.
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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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ffmpeg -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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ffmpeg -i foo.mov -vcodec libxvid -pass 1 -an -f rawvideo -y NUL
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ffmpeg -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 ``ffmpeg2pass''. 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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ffmpeg -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
491
492 a19caa0f Stefano Sabatini
@item -bf @var{frames}
493 4c5f7207 Diego Biurrun
Use 'frames' B-frames (supported for MPEG-1, MPEG-2 and MPEG-4).
494 a19caa0f Stefano Sabatini
@item -mbd @var{mode}
495 18bff752 Fabrice Bellard
macroblock decision
496
@table @samp
497
@item 0
498 4c5f7207 Diego Biurrun
FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in FFmpeg).
499 18bff752 Fabrice Bellard
@item 1
500 4c5f7207 Diego Biurrun
FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
501 18bff752 Fabrice Bellard
@item 2
502 019c8838 Diego Biurrun
FF_MB_DECISION_RD: rate distortion
503 18bff752 Fabrice Bellard
@end table
504
505
@item -4mv
506 4c5f7207 Diego Biurrun
Use four motion vector by macroblock (MPEG-4 only).
507 18bff752 Fabrice Bellard
@item -part
508 4c5f7207 Diego Biurrun
Use data partitioning (MPEG-4 only).
509 a19caa0f Stefano Sabatini
@item -bug @var{param}
510 4c5f7207 Diego Biurrun
Work around encoder bugs that are not auto-detected.
511 a19caa0f Stefano Sabatini
@item -strict @var{strictness}
512 4c5f7207 Diego Biurrun
How strictly to follow the standards.
513 5ee03c86 Fabrice Bellard
@item -aic
514 4c5f7207 Diego Biurrun
Enable Advanced intra coding (h263+).
515 5ee03c86 Fabrice Bellard
@item -umv
516 4c5f7207 Diego Biurrun
Enable Unlimited Motion Vector (h263+)
517 18bff752 Fabrice Bellard
518
@item -deinterlace
519 4c5f7207 Diego Biurrun
Deinterlace pictures.
520 3841e813 Benjamin Larsson
@item -ilme
521 4c5f7207 Diego Biurrun
Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
522
Use this option if your input file is interlaced and you want
523
to keep the interlaced format for minimum losses.
524
The alternative is to deinterlace the input stream with
525
@option{-deinterlace}, but deinterlacing introduces losses.
526 18bff752 Fabrice Bellard
@item -psnr
527 4c5f7207 Diego Biurrun
Calculate PSNR of compressed frames.
528 18bff752 Fabrice Bellard
@item -vstats
529 4c5f7207 Diego Biurrun
Dump video coding statistics to @file{vstats_HHMMSS.log}.
530 a19caa0f Stefano Sabatini
@item -vstats_file @var{file}
531 b60d1379 Stefano Sabatini
Dump video coding statistics to @var{file}.
532 a19caa0f Stefano Sabatini
@item -top @var{n}
533 4386f941 Diego Biurrun
top=1/bottom=0/auto=-1 field first
534 a19caa0f Stefano Sabatini
@item -dc @var{precision}
535 4386f941 Diego Biurrun
Intra_dc_precision.
536 a19caa0f Stefano Sabatini
@item -vtag @var{fourcc/tag}
537 4386f941 Diego Biurrun
Force video tag/fourcc.
538
@item -qphist
539
Show QP histogram.
540 a19caa0f Stefano Sabatini
@item -vbsf @var{bitstream_filter}
541 ba83c4bf Nicolas George
Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
542 5ad2b4c6 tripp
@example
543
ffmpeg -i h264.mp4 -vcodec copy -vbsf h264_mp4toannexb -an out.h264
544
@end example
545 4ad08021 Nicolas George
@item -force_key_frames @var{time}[,@var{time}...]
546
Force key frames at the specified timestamps, more precisely at the first
547
frames after each specified time.
548
This option can be useful to ensure that a seek point is present at a
549
chapter mark or any other designated place in the output file.
550
The timestamps must be specified in ascending order.
551 18bff752 Fabrice Bellard
@end table
552
553
@section Audio Options
554
555
@table @option
556 a19caa0f Stefano Sabatini
@item -aframes @var{number}
557 4386f941 Diego Biurrun
Set the number of audio frames to record.
558 a19caa0f Stefano Sabatini
@item -ar @var{freq}
559 94fcbf5f Carl Eugen Hoyos
Set the audio sampling frequency. For input streams it is set by
560
default to 44100 Hz, for output streams it is set by default to the
561
frequency of the input stream. If the input file has audio streams
562
with different frequencies, the behaviour is undefined.
563 a19caa0f Stefano Sabatini
@item -ab @var{bitrate}
564 5438308f Panagiotis Issaris
Set the audio bitrate in bit/s (default = 64k).
565 385e1658 John Van Sickle
@item -aq @var{q}
566
Set the audio quality (codec-specific, VBR).
567 a19caa0f Stefano Sabatini
@item -ac @var{channels}
568 e1f4dd6d Stefano Sabatini
Set the number of audio channels. For input streams it is set by
569
default to 1, for output streams it is set by default to the same
570
number of audio channels in input. If the input file has audio streams
571
with different channel count, the behaviour is undefined.
572 5ee03c86 Fabrice Bellard
@item -an
573 4c5f7207 Diego Biurrun
Disable audio recording.
574 a19caa0f Stefano Sabatini
@item -acodec @var{codec}
575 4c5f7207 Diego Biurrun
Force audio codec to @var{codec}. Use the @code{copy} special value to
576
specify that the raw codec data must be copied as is.
577 de62a89d Víctor Paesa
@item -newaudio
578 18fd519f Diego Biurrun
Add a new audio track to the output file. If you want to specify parameters,
579
do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..).
580 de62a89d Víctor Paesa
581 18fd519f Diego Biurrun
Mapping will be done automatically, if the number of output streams is equal to
582
the number of input streams, else it will pick the first one that matches. You
583 de62a89d Víctor Paesa
can override the mapping using @code{-map} as usual.
584
585
Example:
586
@example
587 5438308f Panagiotis Issaris
ffmpeg -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio
588 de62a89d Víctor Paesa
@end example
589 a19caa0f Stefano Sabatini
@item -alang @var{code}
590 4386f941 Diego Biurrun
Set the ISO 639 language code (3 letters) of the current audio stream.
591
@end table
592
593
@section Advanced Audio options:
594
595
@table @option
596 a19caa0f Stefano Sabatini
@item -atag @var{fourcc/tag}
597 4386f941 Diego Biurrun
Force audio tag/fourcc.
598 34b47d7c Justin Ruggles
@item -audio_service_type @var{type}
599
Set the type of service that the audio stream contains.
600
@table @option
601
@item ma
602
Main Audio Service (default)
603
@item ef
604
Effects
605
@item vi
606
Visually Impaired
607
@item hi
608
Hearing Impaired
609
@item di
610
Dialogue
611
@item co
612
Commentary
613
@item em
614
Emergency
615
@item vo
616
Voice Over
617
@item ka
618
Karaoke
619
@end table
620 a19caa0f Stefano Sabatini
@item -absf @var{bitstream_filter}
621 4386f941 Diego Biurrun
Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
622
@end table
623
624
@section Subtitle options:
625
626
@table @option
627 a19caa0f Stefano Sabatini
@item -scodec @var{codec}
628 4386f941 Diego Biurrun
Force subtitle codec ('copy' to copy stream).
629
@item -newsubtitle
630
Add a new subtitle stream to the current output stream.
631 a19caa0f Stefano Sabatini
@item -slang @var{code}
632 4386f941 Diego Biurrun
Set the ISO 639 language code (3 letters) of the current subtitle stream.
633 f0ef7bee Diego Biurrun
@item -sn
634
Disable subtitle recording.
635 5ad2b4c6 tripp
@item -sbsf @var{bitstream_filter}
636
Bitstream filters available are "mov2textsub", "text2movsub".
637
@example
638
ffmpeg -i file.mov -an -vn -sbsf mov2textsub -scodec copy -f rawvideo sub.txt
639
@end example
640 18bff752 Fabrice Bellard
@end table
641
642
@section Audio/Video grab options
643
644
@table @option
645 a19caa0f Stefano Sabatini
@item -vc @var{channel}
646 4c5f7207 Diego Biurrun
Set video grab channel (DV1394 only).
647 a19caa0f Stefano Sabatini
@item -tvstd @var{standard}
648 4c5f7207 Diego Biurrun
Set television standard (NTSC, PAL (SECAM)).
649 cc58300e Ramiro Polla
@item -isync
650
Synchronize read on input.
651 18bff752 Fabrice Bellard
@end table
652
653
@section Advanced options
654
655
@table @option
656 cf752d02 Mike Scheutzow
@item -map @var{input_file_id}.@var{input_stream_id}[:@var{sync_file_id}.@var{sync_stream_id}]
657
658
Designate an input stream as a source for the output file. Each input
659
stream is identified by the input file index @var{input_file_id} and
660
the input stream index @var{input_stream_id} within the input
661
file. Both indexes start at 0. If specified,
662
@var{sync_file_id}.@var{sync_stream_id} sets which input stream
663
is used as a presentation sync reference.
664
665
The @code{-map} options must be specified just after the output file.
666
If any @code{-map} options are used, the number of @code{-map} options
667
on the command line must match the number of streams in the output
668
file. The first @code{-map} option on the command line specifies the
669
source for output stream 0, the second @code{-map} option specifies
670
the source for output stream 1, etc.
671
672
For example, if you have two audio streams in the first input file,
673
these streams are identified by "0.0" and "0.1". You can use
674
@code{-map} to select which stream to place in an output file. For
675
example:
676
@example
677
ffmpeg -i INPUT out.wav -map 0.1
678
@end example
679
will map the input stream in @file{INPUT} identified by "0.1" to
680
the (single) output stream in @file{out.wav}.
681
682
For example, to select the stream with index 2 from input file
683
@file{a.mov} (specified by the identifier "0.2"), and stream with
684
index 6 from input @file{b.mov} (specified by the identifier "1.6"),
685
and copy them to the output file @file{out.mov}:
686
@example
687
ffmpeg -i a.mov -i b.mov -vcodec copy -acodec copy out.mov -map 0.2 -map 1.6
688
@end example
689
690
To add more streams to the output file, you can use the
691
@code{-newaudio}, @code{-newvideo}, @code{-newsubtitle} options.
692
693 1829e195 Anton Khirnov
@item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
694 87e4d9b2 Anton Khirnov
Deprecated, use @var{-map_metadata} instead.
695
696
@item -map_metadata @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
697
Set metadata information of @var{outfile} from @var{infile}. Note that those
698 b11b72a6 Anton Khirnov
are file indices (zero-based), not filenames.
699 1829e195 Anton Khirnov
Optional @var{metadata} parameters specify, which metadata to copy - (g)lobal
700
(i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
701
per-(p)rogram. All metadata specifiers other than global must be followed by the
702
stream/chapter/program number. If metadata specifier is omitted, it defaults to
703
global.
704 fb3d8c23 Anton Khirnov
705
By default, global metadata is copied from the first input file to all output files,
706
per-stream and per-chapter metadata is copied along with streams/chapters. These
707
default mappings are disabled by creating any mapping of the relevant type. A negative
708
file index can be used to create a dummy mapping that just disables automatic copying.
709
710 1829e195 Anton Khirnov
For example to copy metadata from the first stream of the input file to global metadata
711
of the output file:
712
@example
713 87e4d9b2 Anton Khirnov
ffmpeg -i in.ogg -map_metadata 0:0,s0 out.mp3
714 1829e195 Anton Khirnov
@end example
715 91e96eba Anton Khirnov
@item -map_chapters @var{outfile}:@var{infile}
716
Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
717
then chapters are copied from the first input file with at least one chapter to all
718
output files. Use a negative file index to disable any chapter copying.
719 18bff752 Fabrice Bellard
@item -debug
720 4c5f7207 Diego Biurrun
Print specific debug info.
721 115329f1 Diego Biurrun
@item -benchmark
722 fc5607f8 Reimar Döffinger
Show benchmarking information at the end of an encode.
723
Shows CPU time used and maximum memory consumption.
724
Maximum memory consumption is not supported on all systems,
725
it will usually display as 0 if not supported.
726 4386f941 Diego Biurrun
@item -dump
727 4c5f7207 Diego Biurrun
Dump each input packet.
728 4386f941 Diego Biurrun
@item -hex
729
When dumping packets, also dump the payload.
730 18bff752 Fabrice Bellard
@item -bitexact
731 4c5f7207 Diego Biurrun
Only use bit exact algorithms (for codec testing).
732 a19caa0f Stefano Sabatini
@item -ps @var{size}
733 2b12317a Martin Storsjö
Set RTP payload size in bytes.
734 5ee03c86 Fabrice Bellard
@item -re
735 4c5f7207 Diego Biurrun
Read input at native frame rate. Mainly used to simulate a grab device.
736 4386f941 Diego Biurrun
@item -loop_input
737 4c5f7207 Diego Biurrun
Loop over the input stream. Currently it works only for image
738
streams. This option is used for automatic FFserver testing.
739 a19caa0f Stefano Sabatini
@item -loop_output @var{number_of_times}
740 019c8838 Diego Biurrun
Repeatedly loop output for formats that support looping such as animated GIF
741 4c5f7207 Diego Biurrun
(0 will loop the output infinitely).
742 a19caa0f Stefano Sabatini
@item -threads @var{count}
743 4386f941 Diego Biurrun
Thread count.
744 a19caa0f Stefano Sabatini
@item -vsync @var{parameter}
745 49553ec8 Michael Niedermayer
Video sync method.
746 f0e5c1c0 Stefano Sabatini
747
@table @option
748
@item 0
749
Each frame is passed with its timestamp from the demuxer to the muxer.
750
@item 1
751
Frames will be duplicated and dropped to achieve exactly the requested
752
constant framerate.
753
@item 2
754
Frames are passed through with their timestamp or dropped so as to
755
prevent 2 frames from having the same timestamp.
756
@item -1
757
Chooses between 1 and 2 depending on muxer capabilities. This is the
758
default method.
759
@end table
760
761
With -map you can select from which stream the timestamps should be
762
taken. You can leave either video or audio unchanged and sync the
763
remaining stream(s) to the unchanged one.
764
765 a19caa0f Stefano Sabatini
@item -async @var{samples_per_second}
766 29c9183c Diego Biurrun
Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
767 c52e13f1 Benjamin Larsson
the parameter is the maximum samples per second by which the audio is changed.
768
-async 1 is a special case where only the start of the audio stream is corrected
769
without any later correction.
770 43399718 Víctor Paesa
@item -copyts
771
Copy timestamps from input to output.
772 fbd56159 Stefano Sabatini
@item -copytb
773
Copy input stream time base from input to output when stream copying.
774 43399718 Víctor Paesa
@item -shortest
775
Finish encoding when the shortest input stream ends.
776
@item -dts_delta_threshold
777
Timestamp discontinuity delta threshold.
778 a19caa0f Stefano Sabatini
@item -muxdelay @var{seconds}
779 43399718 Víctor Paesa
Set the maximum demux-decode delay.
780 a19caa0f Stefano Sabatini
@item -muxpreload @var{seconds}
781 43399718 Víctor Paesa
Set the initial demux-decode delay.
782 006e8108 Mike Scheutzow
@item -streamid @var{output-stream-index}:@var{new-value}
783 20ac9de3 Mike Scheutzow
Assign a new stream-id value to an output stream. This option should be
784
specified prior to the output filename to which it applies.
785
For the situation where multiple output files exist, a streamid
786
may be reassigned to a different value.
787 006e8108 Mike Scheutzow
788
For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
789
an output mpegts file:
790
@example
791
ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
792
@end example
793 9181577c Fabrice Bellard
@end table
794 18bff752 Fabrice Bellard
795 4a60e574 Stefano Sabatini
@section Preset files
796
797
A preset file contains a sequence of @var{option}=@var{value} pairs,
798
one for each line, specifying a sequence of options which would be
799
awkward to specify on the command line. Lines starting with the hash
800
('#') character are ignored and are used to provide comments. Check
801 a6be21d3 Michael Niedermayer
the @file{ffpresets} directory in the FFmpeg source tree for examples.
802 4a60e574 Stefano Sabatini
803 35c504b6 Ramiro Polla
Preset files are specified with the @code{vpre}, @code{apre},
804
@code{spre}, and @code{fpre} options. The @code{fpre} option takes the
805
filename of the preset instead of a preset name as input and can be
806
used for any kind of codec. For the @code{vpre}, @code{apre}, and
807
@code{spre} options, the options specified in a preset file are
808 66e9aa74 Stefano Sabatini
applied to the currently selected codec of the same type as the preset
809
option.
810 4a60e574 Stefano Sabatini
811 35c504b6 Ramiro Polla
The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
812
preset options identifies the preset file to use according to the
813
following rules:
814 4a60e574 Stefano Sabatini
815
First ffmpeg searches for a file named @var{arg}.ffpreset in the
816 2328e5a2 Robert Krüger
directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
817
the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})
818
in that order. For example, if the argument is @code{libx264-max}, it will
819 bd591ead Stefano Sabatini
search for the file @file{libx264-max.ffpreset}.
820 4a60e574 Stefano Sabatini
821
If no such file is found, then ffmpeg will search for a file named
822
@var{codec_name}-@var{arg}.ffpreset in the above-mentioned
823
directories, where @var{codec_name} is the name of the codec to which
824
the preset file options will be applied. For example, if you select
825
the video codec with @code{-vcodec libx264} and use @code{-vpre max},
826
then it will search for the file @file{libx264-max.ffpreset}.
827 e99c4e10 Fabrice Bellard
@c man end
828
829 9181577c Fabrice Bellard
@chapter Tips
830 9f41ed5a Stefano Sabatini
@c man begin TIPS
831 9181577c Fabrice Bellard
832
@itemize
833 9f41ed5a Stefano Sabatini
@item
834
For streaming at very low bitrate application, use a low frame rate
835 4c5f7207 Diego Biurrun
and a small GOP size. This is especially true for RealVideo where
836 e99c4e10 Fabrice Bellard
the Linux player does not seem to be very fast, so it can miss
837
frames. An example is:
838 9181577c Fabrice Bellard
839
@example
840 3c0ba870 Panagiotis Issaris
ffmpeg -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm
841 9181577c Fabrice Bellard
@end example
842
843 9f41ed5a Stefano Sabatini
@item
844
The parameter 'q' which is displayed while encoding is the current
845 4c5f7207 Diego Biurrun
quantizer. The value 1 indicates that a very good quality could
846
be achieved. The value 31 indicates the worst quality. If q=31 appears
847 e99c4e10 Fabrice Bellard
too often, it means that the encoder cannot compress enough to meet
848 4c5f7207 Diego Biurrun
your bitrate. You must either increase the bitrate, decrease the
849 e99c4e10 Fabrice Bellard
frame rate or decrease the frame size.
850 9181577c Fabrice Bellard
851 9f41ed5a Stefano Sabatini
@item
852
If your computer is not fast enough, you can speed up the
853 e99c4e10 Fabrice Bellard
compression at the expense of the compression ratio. You can use
854
'-me zero' to speed up motion estimation, and '-intra' to disable
855 4c5f7207 Diego Biurrun
motion estimation completely (you have only I-frames, which means it
856 e99c4e10 Fabrice Bellard
is about as good as JPEG compression).
857 9181577c Fabrice Bellard
858 9f41ed5a Stefano Sabatini
@item
859
To have very low audio bitrates, reduce the sampling frequency
860 c27c66c3 Benoit Fouet
(down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
861 9181577c Fabrice Bellard
862 9f41ed5a Stefano Sabatini
@item
863
To have a constant quality (but a variable bitrate), use the option
864 e99c4e10 Fabrice Bellard
'-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
865
quality).
866 9181577c Fabrice Bellard
867 9f41ed5a Stefano Sabatini
@item
868
When converting video files, you can use the '-sameq' option which
869 4c5f7207 Diego Biurrun
uses the same quality factor in the encoder as in the decoder.
870
It allows almost lossless encoding.
871 9181577c Fabrice Bellard
872
@end itemize
873 9f41ed5a Stefano Sabatini
@c man end TIPS
874 9181577c Fabrice Bellard
875 76561924 Stefano Sabatini
@chapter Examples
876
@c man begin EXAMPLES
877
878
@section Video and Audio grabbing
879
880
FFmpeg can grab video and audio from devices given that you specify the input
881
format and device.
882
883
@example
884
ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
885
@end example
886
887
Note that you must activate the right video source and channel before
888
launching FFmpeg with any TV viewer such as xawtv
889
(@url{http://linux.bytesex.org/xawtv/}) by Gerd Knorr. You also
890
have to set the audio recording levels correctly with a
891
standard mixer.
892
893
@section X11 grabbing
894
895
FFmpeg can grab the X11 display.
896
897
@example
898 b3555bf0 Reinhard Tartler
ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
899 76561924 Stefano Sabatini
@end example
900
901
0.0 is display.screen number of your X11 server, same as
902
the DISPLAY environment variable.
903
904
@example
905 b3555bf0 Reinhard Tartler
ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
906 76561924 Stefano Sabatini
@end example
907
908
0.0 is display.screen number of your X11 server, same as the DISPLAY environment
909
variable. 10 is the x-offset and 20 the y-offset for the grabbing.
910
911
@section Video and Audio file format conversion
912
913 24003419 Stefano Sabatini
FFmpeg can use any supported file format and protocol as input:
914 76561924 Stefano Sabatini
915
Examples:
916 24003419 Stefano Sabatini
@itemize
917
@item
918
You can use YUV files as input:
919 76561924 Stefano Sabatini
920
@example
921
ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
922
@end example
923
924
It will use the files:
925
@example
926
/tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
927
/tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
928
@end example
929
930
The Y files use twice the resolution of the U and V files. They are
931
raw files, without header. They can be generated by all decent video
932
decoders. You must specify the size of the image with the @option{-s} option
933
if FFmpeg cannot guess it.
934
935 24003419 Stefano Sabatini
@item
936
You can input from a raw YUV420P file:
937 76561924 Stefano Sabatini
938
@example
939
ffmpeg -i /tmp/test.yuv /tmp/out.avi
940
@end example
941
942
test.yuv is a file containing raw YUV planar data. Each frame is composed
943
of the Y plane followed by the U and V planes at half vertical and
944
horizontal resolution.
945
946 24003419 Stefano Sabatini
@item
947
You can output to a raw YUV420P file:
948 76561924 Stefano Sabatini
949
@example
950
ffmpeg -i mydivx.avi hugefile.yuv
951
@end example
952
953 24003419 Stefano Sabatini
@item
954
You can set several input files and output files:
955 76561924 Stefano Sabatini
956
@example
957
ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
958
@end example
959
960
Converts the audio file a.wav and the raw YUV video file a.yuv
961
to MPEG file a.mpg.
962
963 24003419 Stefano Sabatini
@item
964
You can also do audio and video conversions at the same time:
965 76561924 Stefano Sabatini
966
@example
967
ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
968
@end example
969
970
Converts a.wav to MPEG audio at 22050 Hz sample rate.
971
972 24003419 Stefano Sabatini
@item
973
You can encode to several formats at the same time and define a
974 76561924 Stefano Sabatini
mapping from input stream to output streams:
975
976
@example
977
ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
978
@end example
979
980
Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
981
file:index' specifies which input stream is used for each output
982
stream, in the order of the definition of output streams.
983
984 24003419 Stefano Sabatini
@item
985
You can transcode decrypted VOBs:
986 76561924 Stefano Sabatini
987
@example
988
ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
989
@end example
990
991
This is a typical DVD ripping example; the input is a VOB file, the
992
output an AVI file with MPEG-4 video and MP3 audio. Note that in this
993
command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
994
GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
995
input video. Furthermore, the audio stream is MP3-encoded so you need
996
to enable LAME support by passing @code{--enable-libmp3lame} to configure.
997
The mapping is particularly useful for DVD transcoding
998
to get the desired audio language.
999
1000
NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
1001
1002 24003419 Stefano Sabatini
@item
1003
You can extract images from a video, or create a video from many images:
1004 76561924 Stefano Sabatini
1005
For extracting images from a video:
1006
@example
1007
ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
1008
@end example
1009
1010
This will extract one video frame per second from the video and will
1011
output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
1012
etc. Images will be rescaled to fit the new WxH values.
1013
1014
If you want to extract just a limited number of frames, you can use the
1015
above command in combination with the -vframes or -t option, or in
1016
combination with -ss to start extracting from a certain point in time.
1017
1018
For creating a video from many images:
1019
@example
1020
ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
1021
@end example
1022
1023
The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
1024
composed of three digits padded with zeroes to express the sequence
1025
number. It is the same syntax supported by the C printf function, but
1026
only formats accepting a normal integer are suitable.
1027
1028 24003419 Stefano Sabatini
@item
1029
You can put many streams of the same type in the output:
1030 76561924 Stefano Sabatini
1031
@example
1032
ffmpeg -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
1033
@end example
1034
1035
In addition to the first video and audio streams, the resulting
1036
output file @file{test12.avi} will contain the second video
1037
and the second audio stream found in the input streams list.
1038
1039
The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
1040
options have to be specified immediately after the name of the output
1041
file to which you want to add them.
1042 24003419 Stefano Sabatini
1043
@end itemize
1044 76561924 Stefano Sabatini
@c man end EXAMPLES
1045
1046 07851d79 Stefano Sabatini
@include eval.texi
1047 0fa904c9 James Zern
@include encoders.texi
1048 ef298ea7 Stefano Sabatini
@include demuxers.texi
1049 85466e1e Stefano Sabatini
@include muxers.texi
1050 4419c8bf Stefano Sabatini
@include indevs.texi
1051
@include outdevs.texi
1052 1de4cfe6 Stefano Sabatini
@include protocols.texi
1053 361d2758 Stefano Sabatini
@include bitstream_filters.texi
1054 3275ac6a Stefano Sabatini
@include filters.texi
1055 a4651511 Anton Khirnov
@include metadata.texi
1056 3275ac6a Stefano Sabatini
1057 cadbccb6 Stefano Sabatini
@ignore
1058
1059
@setfilename ffmpeg
1060
@settitle FFmpeg video converter
1061
1062
@c man begin SEEALSO
1063 a6be21d3 Michael Niedermayer
ffplay(1), ffprobe(1), ffserver(1) and the FFmpeg HTML documentation
1064 cadbccb6 Stefano Sabatini
@c man end
1065
1066 aeadb328 Stefano Sabatini
@c man begin AUTHORS
1067 a6be21d3 Michael Niedermayer
The FFmpeg developers
1068 cadbccb6 Stefano Sabatini
@c man end
1069
1070
@end ignore
1071
1072 9181577c Fabrice Bellard
@bye