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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 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 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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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, ffmpeg 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 aspect ratio (4:3, 16:9 or 1.3333, 1.7777).
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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
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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).
483 a19caa0f Stefano Sabatini
@item -mbd @var{mode}
484 18bff752 Fabrice Bellard
macroblock decision
485
@table @samp
486
@item 0
487 3a50894e Diego Biurrun
FF_MB_DECISION_SIMPLE: Use mb_cmp (cannot change it yet in ffmpeg).
488 18bff752 Fabrice Bellard
@item 1
489 4c5f7207 Diego Biurrun
FF_MB_DECISION_BITS: Choose the one which needs the fewest bits.
490 18bff752 Fabrice Bellard
@item 2
491 019c8838 Diego Biurrun
FF_MB_DECISION_RD: rate distortion
492 18bff752 Fabrice Bellard
@end table
493
494
@item -4mv
495 4c5f7207 Diego Biurrun
Use four motion vector by macroblock (MPEG-4 only).
496 18bff752 Fabrice Bellard
@item -part
497 4c5f7207 Diego Biurrun
Use data partitioning (MPEG-4 only).
498 a19caa0f Stefano Sabatini
@item -bug @var{param}
499 4c5f7207 Diego Biurrun
Work around encoder bugs that are not auto-detected.
500 a19caa0f Stefano Sabatini
@item -strict @var{strictness}
501 4c5f7207 Diego Biurrun
How strictly to follow the standards.
502 5ee03c86 Fabrice Bellard
@item -aic
503 4c5f7207 Diego Biurrun
Enable Advanced intra coding (h263+).
504 5ee03c86 Fabrice Bellard
@item -umv
505 4c5f7207 Diego Biurrun
Enable Unlimited Motion Vector (h263+)
506 18bff752 Fabrice Bellard
507
@item -deinterlace
508 4c5f7207 Diego Biurrun
Deinterlace pictures.
509 3841e813 Benjamin Larsson
@item -ilme
510 4c5f7207 Diego Biurrun
Force interlacing support in encoder (MPEG-2 and MPEG-4 only).
511
Use this option if your input file is interlaced and you want
512
to keep the interlaced format for minimum losses.
513
The alternative is to deinterlace the input stream with
514
@option{-deinterlace}, but deinterlacing introduces losses.
515 18bff752 Fabrice Bellard
@item -psnr
516 4c5f7207 Diego Biurrun
Calculate PSNR of compressed frames.
517 18bff752 Fabrice Bellard
@item -vstats
518 4c5f7207 Diego Biurrun
Dump video coding statistics to @file{vstats_HHMMSS.log}.
519 a19caa0f Stefano Sabatini
@item -vstats_file @var{file}
520 b60d1379 Stefano Sabatini
Dump video coding statistics to @var{file}.
521 a19caa0f Stefano Sabatini
@item -top @var{n}
522 4386f941 Diego Biurrun
top=1/bottom=0/auto=-1 field first
523 a19caa0f Stefano Sabatini
@item -dc @var{precision}
524 4386f941 Diego Biurrun
Intra_dc_precision.
525 a19caa0f Stefano Sabatini
@item -vtag @var{fourcc/tag}
526 4386f941 Diego Biurrun
Force video tag/fourcc.
527
@item -qphist
528
Show QP histogram.
529 a19caa0f Stefano Sabatini
@item -vbsf @var{bitstream_filter}
530 ba83c4bf Nicolas George
Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
531 5ad2b4c6 tripp
@example
532
ffmpeg -i h264.mp4 -vcodec copy -vbsf h264_mp4toannexb -an out.h264
533
@end example
534 4ad08021 Nicolas George
@item -force_key_frames @var{time}[,@var{time}...]
535
Force key frames at the specified timestamps, more precisely at the first
536
frames after each specified time.
537
This option can be useful to ensure that a seek point is present at a
538
chapter mark or any other designated place in the output file.
539
The timestamps must be specified in ascending order.
540 18bff752 Fabrice Bellard
@end table
541
542
@section Audio Options
543
544
@table @option
545 a19caa0f Stefano Sabatini
@item -aframes @var{number}
546 4386f941 Diego Biurrun
Set the number of audio frames to record.
547 a19caa0f Stefano Sabatini
@item -ar @var{freq}
548 94fcbf5f Carl Eugen Hoyos
Set the audio sampling frequency. For input streams it is set by
549
default to 44100 Hz, for output streams it is set by default to the
550
frequency of the input stream. If the input file has audio streams
551
with different frequencies, the behaviour is undefined.
552 a19caa0f Stefano Sabatini
@item -ab @var{bitrate}
553 5438308f Panagiotis Issaris
Set the audio bitrate in bit/s (default = 64k).
554 385e1658 John Van Sickle
@item -aq @var{q}
555
Set the audio quality (codec-specific, VBR).
556 a19caa0f Stefano Sabatini
@item -ac @var{channels}
557 e1f4dd6d Stefano Sabatini
Set the number of audio channels. For input streams it is set by
558
default to 1, for output streams it is set by default to the same
559
number of audio channels in input. If the input file has audio streams
560
with different channel count, the behaviour is undefined.
561 5ee03c86 Fabrice Bellard
@item -an
562 4c5f7207 Diego Biurrun
Disable audio recording.
563 a19caa0f Stefano Sabatini
@item -acodec @var{codec}
564 4c5f7207 Diego Biurrun
Force audio codec to @var{codec}. Use the @code{copy} special value to
565
specify that the raw codec data must be copied as is.
566 de62a89d Víctor Paesa
@item -newaudio
567 18fd519f Diego Biurrun
Add a new audio track to the output file. If you want to specify parameters,
568
do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..).
569 de62a89d Víctor Paesa
570 18fd519f Diego Biurrun
Mapping will be done automatically, if the number of output streams is equal to
571
the number of input streams, else it will pick the first one that matches. You
572 de62a89d Víctor Paesa
can override the mapping using @code{-map} as usual.
573
574
Example:
575
@example
576 5438308f Panagiotis Issaris
ffmpeg -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio
577 de62a89d Víctor Paesa
@end example
578 a19caa0f Stefano Sabatini
@item -alang @var{code}
579 4386f941 Diego Biurrun
Set the ISO 639 language code (3 letters) of the current audio stream.
580
@end table
581
582
@section Advanced Audio options:
583
584
@table @option
585 a19caa0f Stefano Sabatini
@item -atag @var{fourcc/tag}
586 4386f941 Diego Biurrun
Force audio tag/fourcc.
587 34b47d7c Justin Ruggles
@item -audio_service_type @var{type}
588
Set the type of service that the audio stream contains.
589
@table @option
590
@item ma
591
Main Audio Service (default)
592
@item ef
593
Effects
594
@item vi
595
Visually Impaired
596
@item hi
597
Hearing Impaired
598
@item di
599
Dialogue
600
@item co
601
Commentary
602
@item em
603
Emergency
604
@item vo
605
Voice Over
606
@item ka
607
Karaoke
608
@end table
609 a19caa0f Stefano Sabatini
@item -absf @var{bitstream_filter}
610 4386f941 Diego Biurrun
Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
611
@end table
612
613
@section Subtitle options:
614
615
@table @option
616 a19caa0f Stefano Sabatini
@item -scodec @var{codec}
617 4386f941 Diego Biurrun
Force subtitle codec ('copy' to copy stream).
618
@item -newsubtitle
619
Add a new subtitle stream to the current output stream.
620 a19caa0f Stefano Sabatini
@item -slang @var{code}
621 4386f941 Diego Biurrun
Set the ISO 639 language code (3 letters) of the current subtitle stream.
622 f0ef7bee Diego Biurrun
@item -sn
623
Disable subtitle recording.
624 5ad2b4c6 tripp
@item -sbsf @var{bitstream_filter}
625
Bitstream filters available are "mov2textsub", "text2movsub".
626
@example
627
ffmpeg -i file.mov -an -vn -sbsf mov2textsub -scodec copy -f rawvideo sub.txt
628
@end example
629 18bff752 Fabrice Bellard
@end table
630
631
@section Audio/Video grab options
632
633
@table @option
634 a19caa0f Stefano Sabatini
@item -vc @var{channel}
635 4c5f7207 Diego Biurrun
Set video grab channel (DV1394 only).
636 a19caa0f Stefano Sabatini
@item -tvstd @var{standard}
637 4c5f7207 Diego Biurrun
Set television standard (NTSC, PAL (SECAM)).
638 cc58300e Ramiro Polla
@item -isync
639
Synchronize read on input.
640 18bff752 Fabrice Bellard
@end table
641
642
@section Advanced options
643
644
@table @option
645 cf752d02 Mike Scheutzow
@item -map @var{input_file_id}.@var{input_stream_id}[:@var{sync_file_id}.@var{sync_stream_id}]
646
647
Designate an input stream as a source for the output file. Each input
648
stream is identified by the input file index @var{input_file_id} and
649
the input stream index @var{input_stream_id} within the input
650
file. Both indexes start at 0. If specified,
651
@var{sync_file_id}.@var{sync_stream_id} sets which input stream
652
is used as a presentation sync reference.
653
654
The @code{-map} options must be specified just after the output file.
655
If any @code{-map} options are used, the number of @code{-map} options
656
on the command line must match the number of streams in the output
657
file. The first @code{-map} option on the command line specifies the
658
source for output stream 0, the second @code{-map} option specifies
659
the source for output stream 1, etc.
660
661
For example, if you have two audio streams in the first input file,
662
these streams are identified by "0.0" and "0.1". You can use
663
@code{-map} to select which stream to place in an output file. For
664
example:
665
@example
666
ffmpeg -i INPUT out.wav -map 0.1
667
@end example
668
will map the input stream in @file{INPUT} identified by "0.1" to
669
the (single) output stream in @file{out.wav}.
670
671
For example, to select the stream with index 2 from input file
672
@file{a.mov} (specified by the identifier "0.2"), and stream with
673
index 6 from input @file{b.mov} (specified by the identifier "1.6"),
674
and copy them to the output file @file{out.mov}:
675
@example
676
ffmpeg -i a.mov -i b.mov -vcodec copy -acodec copy out.mov -map 0.2 -map 1.6
677
@end example
678
679
To add more streams to the output file, you can use the
680
@code{-newaudio}, @code{-newvideo}, @code{-newsubtitle} options.
681
682 1829e195 Anton Khirnov
@item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
683 87e4d9b2 Anton Khirnov
Deprecated, use @var{-map_metadata} instead.
684
685
@item -map_metadata @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
686
Set metadata information of @var{outfile} from @var{infile}. Note that those
687 b11b72a6 Anton Khirnov
are file indices (zero-based), not filenames.
688 1829e195 Anton Khirnov
Optional @var{metadata} parameters specify, which metadata to copy - (g)lobal
689
(i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
690
per-(p)rogram. All metadata specifiers other than global must be followed by the
691
stream/chapter/program number. If metadata specifier is omitted, it defaults to
692
global.
693 fb3d8c23 Anton Khirnov
694
By default, global metadata is copied from the first input file to all output files,
695
per-stream and per-chapter metadata is copied along with streams/chapters. These
696
default mappings are disabled by creating any mapping of the relevant type. A negative
697
file index can be used to create a dummy mapping that just disables automatic copying.
698
699 1829e195 Anton Khirnov
For example to copy metadata from the first stream of the input file to global metadata
700
of the output file:
701
@example
702 87e4d9b2 Anton Khirnov
ffmpeg -i in.ogg -map_metadata 0:0,s0 out.mp3
703 1829e195 Anton Khirnov
@end example
704 91e96eba Anton Khirnov
@item -map_chapters @var{outfile}:@var{infile}
705
Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
706
then chapters are copied from the first input file with at least one chapter to all
707
output files. Use a negative file index to disable any chapter copying.
708 18bff752 Fabrice Bellard
@item -debug
709 4c5f7207 Diego Biurrun
Print specific debug info.
710 115329f1 Diego Biurrun
@item -benchmark
711 fc5607f8 Reimar Döffinger
Show benchmarking information at the end of an encode.
712
Shows CPU time used and maximum memory consumption.
713
Maximum memory consumption is not supported on all systems,
714
it will usually display as 0 if not supported.
715 4386f941 Diego Biurrun
@item -dump
716 4c5f7207 Diego Biurrun
Dump each input packet.
717 4386f941 Diego Biurrun
@item -hex
718
When dumping packets, also dump the payload.
719 18bff752 Fabrice Bellard
@item -bitexact
720 4c5f7207 Diego Biurrun
Only use bit exact algorithms (for codec testing).
721 a19caa0f Stefano Sabatini
@item -ps @var{size}
722 2b12317a Martin Storsjö
Set RTP payload size in bytes.
723 5ee03c86 Fabrice Bellard
@item -re
724 4c5f7207 Diego Biurrun
Read input at native frame rate. Mainly used to simulate a grab device.
725 4386f941 Diego Biurrun
@item -loop_input
726 4c5f7207 Diego Biurrun
Loop over the input stream. Currently it works only for image
727
streams. This option is used for automatic FFserver testing.
728 a19caa0f Stefano Sabatini
@item -loop_output @var{number_of_times}
729 019c8838 Diego Biurrun
Repeatedly loop output for formats that support looping such as animated GIF
730 4c5f7207 Diego Biurrun
(0 will loop the output infinitely).
731 a19caa0f Stefano Sabatini
@item -threads @var{count}
732 4386f941 Diego Biurrun
Thread count.
733 a19caa0f Stefano Sabatini
@item -vsync @var{parameter}
734 49553ec8 Michael Niedermayer
Video sync method.
735 f0e5c1c0 Stefano Sabatini
736
@table @option
737
@item 0
738
Each frame is passed with its timestamp from the demuxer to the muxer.
739
@item 1
740
Frames will be duplicated and dropped to achieve exactly the requested
741
constant framerate.
742
@item 2
743
Frames are passed through with their timestamp or dropped so as to
744
prevent 2 frames from having the same timestamp.
745
@item -1
746
Chooses between 1 and 2 depending on muxer capabilities. This is the
747
default method.
748
@end table
749
750
With -map you can select from which stream the timestamps should be
751
taken. You can leave either video or audio unchanged and sync the
752
remaining stream(s) to the unchanged one.
753
754 a19caa0f Stefano Sabatini
@item -async @var{samples_per_second}
755 29c9183c Diego Biurrun
Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps,
756 c52e13f1 Benjamin Larsson
the parameter is the maximum samples per second by which the audio is changed.
757
-async 1 is a special case where only the start of the audio stream is corrected
758
without any later correction.
759 43399718 Víctor Paesa
@item -copyts
760
Copy timestamps from input to output.
761 fbd56159 Stefano Sabatini
@item -copytb
762
Copy input stream time base from input to output when stream copying.
763 43399718 Víctor Paesa
@item -shortest
764
Finish encoding when the shortest input stream ends.
765
@item -dts_delta_threshold
766
Timestamp discontinuity delta threshold.
767 a19caa0f Stefano Sabatini
@item -muxdelay @var{seconds}
768 43399718 Víctor Paesa
Set the maximum demux-decode delay.
769 a19caa0f Stefano Sabatini
@item -muxpreload @var{seconds}
770 43399718 Víctor Paesa
Set the initial demux-decode delay.
771 006e8108 Mike Scheutzow
@item -streamid @var{output-stream-index}:@var{new-value}
772 20ac9de3 Mike Scheutzow
Assign a new stream-id value to an output stream. This option should be
773
specified prior to the output filename to which it applies.
774
For the situation where multiple output files exist, a streamid
775
may be reassigned to a different value.
776 006e8108 Mike Scheutzow
777
For example, to set the stream 0 PID to 33 and the stream 1 PID to 36 for
778
an output mpegts file:
779
@example
780
ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
781
@end example
782 9181577c Fabrice Bellard
@end table
783 18bff752 Fabrice Bellard
784 4a60e574 Stefano Sabatini
@section Preset files
785
786
A preset file contains a sequence of @var{option}=@var{value} pairs,
787
one for each line, specifying a sequence of options which would be
788
awkward to specify on the command line. Lines starting with the hash
789
('#') character are ignored and are used to provide comments. Check
790 f8a45fa1 Janne Grunau
the @file{ffpresets} directory in the Libav source tree for examples.
791 4a60e574 Stefano Sabatini
792 35c504b6 Ramiro Polla
Preset files are specified with the @code{vpre}, @code{apre},
793
@code{spre}, and @code{fpre} options. The @code{fpre} option takes the
794
filename of the preset instead of a preset name as input and can be
795
used for any kind of codec. For the @code{vpre}, @code{apre}, and
796
@code{spre} options, the options specified in a preset file are
797 66e9aa74 Stefano Sabatini
applied to the currently selected codec of the same type as the preset
798
option.
799 4a60e574 Stefano Sabatini
800 35c504b6 Ramiro Polla
The argument passed to the @code{vpre}, @code{apre}, and @code{spre}
801
preset options identifies the preset file to use according to the
802
following rules:
803 4a60e574 Stefano Sabatini
804
First ffmpeg searches for a file named @var{arg}.ffpreset in the
805 2328e5a2 Robert Krüger
directories @file{$FFMPEG_DATADIR} (if set), and @file{$HOME/.ffmpeg}, and in
806
the datadir defined at configuration time (usually @file{PREFIX/share/ffmpeg})
807
in that order. For example, if the argument is @code{libx264-max}, it will
808 bd591ead Stefano Sabatini
search for the file @file{libx264-max.ffpreset}.
809 4a60e574 Stefano Sabatini
810
If no such file is found, then ffmpeg will search for a file named
811
@var{codec_name}-@var{arg}.ffpreset in the above-mentioned
812
directories, where @var{codec_name} is the name of the codec to which
813
the preset file options will be applied. For example, if you select
814
the video codec with @code{-vcodec libx264} and use @code{-vpre max},
815
then it will search for the file @file{libx264-max.ffpreset}.
816 e99c4e10 Fabrice Bellard
@c man end
817
818 9181577c Fabrice Bellard
@chapter Tips
819 9f41ed5a Stefano Sabatini
@c man begin TIPS
820 9181577c Fabrice Bellard
821
@itemize
822 9f41ed5a Stefano Sabatini
@item
823
For streaming at very low bitrate application, use a low frame rate
824 4c5f7207 Diego Biurrun
and a small GOP size. This is especially true for RealVideo where
825 e99c4e10 Fabrice Bellard
the Linux player does not seem to be very fast, so it can miss
826
frames. An example is:
827 9181577c Fabrice Bellard
828
@example
829 3c0ba870 Panagiotis Issaris
ffmpeg -g 3 -r 3 -t 10 -b 50k -s qcif -f rv10 /tmp/b.rm
830 9181577c Fabrice Bellard
@end example
831
832 9f41ed5a Stefano Sabatini
@item
833
The parameter 'q' which is displayed while encoding is the current
834 4c5f7207 Diego Biurrun
quantizer. The value 1 indicates that a very good quality could
835
be achieved. The value 31 indicates the worst quality. If q=31 appears
836 e99c4e10 Fabrice Bellard
too often, it means that the encoder cannot compress enough to meet
837 4c5f7207 Diego Biurrun
your bitrate. You must either increase the bitrate, decrease the
838 e99c4e10 Fabrice Bellard
frame rate or decrease the frame size.
839 9181577c Fabrice Bellard
840 9f41ed5a Stefano Sabatini
@item
841
If your computer is not fast enough, you can speed up the
842 e99c4e10 Fabrice Bellard
compression at the expense of the compression ratio. You can use
843
'-me zero' to speed up motion estimation, and '-intra' to disable
844 4c5f7207 Diego Biurrun
motion estimation completely (you have only I-frames, which means it
845 e99c4e10 Fabrice Bellard
is about as good as JPEG compression).
846 9181577c Fabrice Bellard
847 9f41ed5a Stefano Sabatini
@item
848
To have very low audio bitrates, reduce the sampling frequency
849 c27c66c3 Benoit Fouet
(down to 22050 Hz for MPEG audio, 22050 or 11025 for AC-3).
850 9181577c Fabrice Bellard
851 9f41ed5a Stefano Sabatini
@item
852
To have a constant quality (but a variable bitrate), use the option
853 e99c4e10 Fabrice Bellard
'-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
854
quality).
855 9181577c Fabrice Bellard
856 9f41ed5a Stefano Sabatini
@item
857
When converting video files, you can use the '-sameq' option which
858 4c5f7207 Diego Biurrun
uses the same quality factor in the encoder as in the decoder.
859
It allows almost lossless encoding.
860 9181577c Fabrice Bellard
861
@end itemize
862 9f41ed5a Stefano Sabatini
@c man end TIPS
863 9181577c Fabrice Bellard
864 76561924 Stefano Sabatini
@chapter Examples
865
@c man begin EXAMPLES
866
867
@section Video and Audio grabbing
868
869 3a50894e Diego Biurrun
If you specify the input format and device then ffmpeg can grab video
870
and audio directly.
871 76561924 Stefano Sabatini
872
@example
873
ffmpeg -f oss -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg
874
@end example
875
876
Note that you must activate the right video source and channel before
877 3a50894e Diego Biurrun
launching ffmpeg with any TV viewer such as xawtv
878 76561924 Stefano Sabatini
(@url{http://linux.bytesex.org/xawtv/}) by Gerd Knorr. You also
879
have to set the audio recording levels correctly with a
880
standard mixer.
881
882
@section X11 grabbing
883
884 3a50894e Diego Biurrun
Grab the X11 display with ffmpeg via
885 76561924 Stefano Sabatini
886
@example
887 b3555bf0 Reinhard Tartler
ffmpeg -f x11grab -s cif -r 25 -i :0.0 /tmp/out.mpg
888 76561924 Stefano Sabatini
@end example
889
890
0.0 is display.screen number of your X11 server, same as
891
the DISPLAY environment variable.
892
893
@example
894 b3555bf0 Reinhard Tartler
ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
895 76561924 Stefano Sabatini
@end example
896
897
0.0 is display.screen number of your X11 server, same as the DISPLAY environment
898
variable. 10 is the x-offset and 20 the y-offset for the grabbing.
899
900
@section Video and Audio file format conversion
901
902 3a50894e Diego Biurrun
Any supported file format and protocol can serve as input to ffmpeg:
903 76561924 Stefano Sabatini
904
Examples:
905 24003419 Stefano Sabatini
@itemize
906
@item
907
You can use YUV files as input:
908 76561924 Stefano Sabatini
909
@example
910
ffmpeg -i /tmp/test%d.Y /tmp/out.mpg
911
@end example
912
913
It will use the files:
914
@example
915
/tmp/test0.Y, /tmp/test0.U, /tmp/test0.V,
916
/tmp/test1.Y, /tmp/test1.U, /tmp/test1.V, etc...
917
@end example
918
919
The Y files use twice the resolution of the U and V files. They are
920
raw files, without header. They can be generated by all decent video
921
decoders. You must specify the size of the image with the @option{-s} option
922 3a50894e Diego Biurrun
if ffmpeg cannot guess it.
923 76561924 Stefano Sabatini
924 24003419 Stefano Sabatini
@item
925
You can input from a raw YUV420P file:
926 76561924 Stefano Sabatini
927
@example
928
ffmpeg -i /tmp/test.yuv /tmp/out.avi
929
@end example
930
931
test.yuv is a file containing raw YUV planar data. Each frame is composed
932
of the Y plane followed by the U and V planes at half vertical and
933
horizontal resolution.
934
935 24003419 Stefano Sabatini
@item
936
You can output to a raw YUV420P file:
937 76561924 Stefano Sabatini
938
@example
939
ffmpeg -i mydivx.avi hugefile.yuv
940
@end example
941
942 24003419 Stefano Sabatini
@item
943
You can set several input files and output files:
944 76561924 Stefano Sabatini
945
@example
946
ffmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpg
947
@end example
948
949
Converts the audio file a.wav and the raw YUV video file a.yuv
950
to MPEG file a.mpg.
951
952 24003419 Stefano Sabatini
@item
953
You can also do audio and video conversions at the same time:
954 76561924 Stefano Sabatini
955
@example
956
ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
957
@end example
958
959
Converts a.wav to MPEG audio at 22050 Hz sample rate.
960
961 24003419 Stefano Sabatini
@item
962
You can encode to several formats at the same time and define a
963 76561924 Stefano Sabatini
mapping from input stream to output streams:
964
965
@example
966
ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
967
@end example
968
969
Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
970
file:index' specifies which input stream is used for each output
971
stream, in the order of the definition of output streams.
972
973 24003419 Stefano Sabatini
@item
974
You can transcode decrypted VOBs:
975 76561924 Stefano Sabatini
976
@example
977
ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
978
@end example
979
980
This is a typical DVD ripping example; the input is a VOB file, the
981
output an AVI file with MPEG-4 video and MP3 audio. Note that in this
982
command we use B-frames so the MPEG-4 stream is DivX5 compatible, and
983
GOP size is 300 which means one intra frame every 10 seconds for 29.97fps
984
input video. Furthermore, the audio stream is MP3-encoded so you need
985
to enable LAME support by passing @code{--enable-libmp3lame} to configure.
986
The mapping is particularly useful for DVD transcoding
987
to get the desired audio language.
988
989
NOTE: To see the supported input formats, use @code{ffmpeg -formats}.
990
991 24003419 Stefano Sabatini
@item
992
You can extract images from a video, or create a video from many images:
993 76561924 Stefano Sabatini
994
For extracting images from a video:
995
@example
996
ffmpeg -i foo.avi -r 1 -s WxH -f image2 foo-%03d.jpeg
997
@end example
998
999
This will extract one video frame per second from the video and will
1000
output them in files named @file{foo-001.jpeg}, @file{foo-002.jpeg},
1001
etc. Images will be rescaled to fit the new WxH values.
1002
1003
If you want to extract just a limited number of frames, you can use the
1004
above command in combination with the -vframes or -t option, or in
1005
combination with -ss to start extracting from a certain point in time.
1006
1007
For creating a video from many images:
1008
@example
1009
ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
1010
@end example
1011
1012
The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
1013
composed of three digits padded with zeroes to express the sequence
1014
number. It is the same syntax supported by the C printf function, but
1015
only formats accepting a normal integer are suitable.
1016
1017 24003419 Stefano Sabatini
@item
1018
You can put many streams of the same type in the output:
1019 76561924 Stefano Sabatini
1020
@example
1021
ffmpeg -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
1022
@end example
1023
1024
In addition to the first video and audio streams, the resulting
1025
output file @file{test12.avi} will contain the second video
1026
and the second audio stream found in the input streams list.
1027
1028
The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
1029
options have to be specified immediately after the name of the output
1030
file to which you want to add them.
1031 24003419 Stefano Sabatini
1032
@end itemize
1033 76561924 Stefano Sabatini
@c man end EXAMPLES
1034
1035 07851d79 Stefano Sabatini
@include eval.texi
1036 0fa904c9 James Zern
@include encoders.texi
1037 ef298ea7 Stefano Sabatini
@include demuxers.texi
1038 85466e1e Stefano Sabatini
@include muxers.texi
1039 4419c8bf Stefano Sabatini
@include indevs.texi
1040
@include outdevs.texi
1041 1de4cfe6 Stefano Sabatini
@include protocols.texi
1042 361d2758 Stefano Sabatini
@include bitstream_filters.texi
1043 3275ac6a Stefano Sabatini
@include filters.texi
1044 a4651511 Anton Khirnov
@include metadata.texi
1045 3275ac6a Stefano Sabatini
1046 cadbccb6 Stefano Sabatini
@ignore
1047
1048
@setfilename ffmpeg
1049 89b503b5 Diego Biurrun
@settitle ffmpeg video converter
1050 cadbccb6 Stefano Sabatini
1051
@c man begin SEEALSO
1052 f8a45fa1 Janne Grunau
ffplay(1), ffprobe(1), ffserver(1) and the Libav HTML documentation
1053 cadbccb6 Stefano Sabatini
@c man end
1054
1055 aeadb328 Stefano Sabatini
@c man begin AUTHORS
1056 f8a45fa1 Janne Grunau
The Libav developers
1057 cadbccb6 Stefano Sabatini
@c man end
1058
1059
@end ignore
1060
1061 9181577c Fabrice Bellard
@bye