mirror of https://git.ffmpeg.org/ffmpeg.git
Merge avconv.texi in ffmpeg.texi
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Michael Niedermayer
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401
doc/ffmpeg.texi
401
doc/ffmpeg.texi
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@ -15,7 +15,7 @@ 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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ffmpeg [global options] [[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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@ -26,15 +26,12 @@ 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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Exceptions from this rule are the global options (e.g. verbosity level),
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which should be specified first.
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@itemize
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@item
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@ -59,12 +56,22 @@ ffmpeg -r 1 -i input.m2v -r 24 output.avi
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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 Stream selection
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@c man begin STREAM SELECTION
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By default ffmpeg tries to pick the "best" stream of each type present in input
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files and add them to each output file. For video, this means the highest
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resolution, for audio the highest channel count. For subtitle it's simply the
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first subtitle stream.
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You can disable some of those defaults by using @code{-vn/-an/-sn} options. For
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full manual control, use the @code{-map} option, which disables the defaults just
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described.
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@c man end STREAM SELECTION
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@chapter Options
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@c man begin OPTIONS
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@ -74,36 +81,59 @@ specified for the inputs.
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@table @option
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@item -f @var{fmt}
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@item -f @var{fmt} (@emph{input/output})
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Force format.
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@item -i @var{filename}
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@item -i @var{filename} (@emph{input})
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input file name
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@item -y
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@item -y (@emph{global})
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Overwrite output files.
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@item -t @var{duration}
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@item -c[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
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@itemx -codec[:@var{stream_specifier}] @var{codec} (@emph{input/output,per-stream})
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Select an encoder (when used before an output file) or a decoder (when used
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before an input file) for one or more streams. @var{codec} is the name of a
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decoder/encoder or a special value @code{copy} (output only) to indicate that
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the stream is not to be reencoded.
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For example
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@example
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ffmpeg -i INPUT -map 0 -c:v libx264 -c:a copy OUTPUT
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@end example
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encodes all video streams with libx264 and copies all audio streams.
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For each stream, the last matching @code{c} option is applied, so
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@example
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ffmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT
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@end example
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will copy all the streams except the second video, which will be encoded with
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libx264, and the 138th audio, which will be encoded with libvorbis.
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@item -t @var{duration} (@emph{output})
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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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@item -fs @var{limit_size} (@emph{output})
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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 -ss @var{position} (@emph{input/output})
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When used as an input option (before @code{-i}), seeks in this input file to
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@var{position}. When used as an output option (before an output filename),
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decodes but discards input until the timestamps reach @var{position}. This is
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slower, but more accurate.
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@item -itsoffset @var{offset}
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@var{position} may be either in seconds or in @code{hh:mm:ss[.xxx]} form.
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@item -itsoffset @var{offset} (@emph{input})
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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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@item -timestamp @var{time} (@emph{output})
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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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@ -115,18 +145,30 @@ 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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@item -metadata[:metadata_specifier] @var{key}=@var{value} (@emph{output,per-metadata})
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Set a metadata key/value pair.
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An optional @var{metadata_specifier} may be given to set metadata
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on streams or chapters. See @code{-map_metadata} documentation for
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details.
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This option overrides metadata set with @code{-map_metadata}. It is
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also possible to delete metadata by using an empty value.
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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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To set the language of the second stream:
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@example
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ffmpeg -i INPUT -metadata:s:1 language=eng OUTPUT
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@end example
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@item -v @var{number} (@emph{global})
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Set the logging verbosity level.
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@item -target @var{type}
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@item -target @var{type} (@emph{output})
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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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@ -142,31 +184,33 @@ they do not conflict with the standard, as in:
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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 -dframes @var{number} (@emph{output})
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Set the number of data frames to record. This is an alias for @code{-frames:d}.
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@item -scodec @var{codec}
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Force subtitle codec ('copy' to copy stream).
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@item -frames[:@var{stream_specifier}] @var{framecount} (@emph{output,per-stream})
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Stop writing to the stream after @var{framecount} frames.
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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 -q[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
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@itemx -qscale[:@var{stream_specifier}] @var{q} (@emph{output,per-stream})
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Use fixed quality scale (VBR). The meaning of @var{q} is
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codec-dependent.
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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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@item -filter[:@var{stream_specifier}] @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 stream. Use @code{-filters} to show all the available filters
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(including also sources and sinks).
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@end table
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@section Video Options
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@table @option
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@item -vframes @var{number}
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Set the number of video frames to record.
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@item -r @var{fps}
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@item -vframes @var{number} (@emph{output})
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Set the number of video frames to record. This is an alias for @code{-frames:v}.
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@item -r[:@var{stream_specifier}] @var{fps} (@emph{input/output,per-stream})
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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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@item -s[:@var{stream_specifier}] @var{size} (@emph{input/output,per-stream})
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Set frame size. The format is @samp{wxh} (avserver 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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@ -229,7 +273,7 @@ The following abbreviations are recognized:
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1920x1080
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@end table
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@item -aspect @var{aspect}
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@item -aspect[:@var{stream_specifier}] @var{aspect} (@emph{output,per-stream})
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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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@ -251,7 +295,8 @@ crop=width:height:x:y instead.
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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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@item -vn (@emph{output})
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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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@ -272,12 +317,14 @@ ffmpeg -i myfile.avi -b 4000k -minrate 4000k -maxrate 4000k -bufsize 1835k out.m
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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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@item -vcodec @var{codec} (@emph{output})
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Set the video codec. This is an alias for @code{-codec:v}.
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@item -same_quant
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Use same quantizer as source (implies VBR).
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Note that this is NOT SAME QUALITY. Do not use this option unless you know you
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need it.
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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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@ -287,46 +334,41 @@ 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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ffmpeg -i foo.mov -c:v libxvid -pass 1 -an -f rawvideo -y NUL
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ffmpeg -i foo.mov -c:v 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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@item -passlogfile @var{prefix} (@emph{global})
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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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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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@item -vf @var{filter_graph} (@emph{output})
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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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also sources and sinks). This is an alias for @code{-filter:v}.
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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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@item -pix_fmt[:@var{stream_specifier}] @var{format} (@emph{input/output,per-stream})
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Set pixel format. Use @code{-pix_fmts} to show all the supported
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pixel formats.
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@item -sws_flags @var{flags}
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@item -sws_flags @var{flags} (@emph{input/output})
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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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deprecated, use -g 1
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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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@ -398,7 +440,7 @@ and the following constants are available:
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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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@item -rc_override[:@var{stream_specifier}] @var{override} (@emph{output,per-stream})
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Rate control override for specific intervals, formated as "int,int,int"
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list separated with slashes. Two first values are the beginning and
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end frame numbers, last one is quantizer to use if positive, or quality
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@ -474,7 +516,7 @@ 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_EXPLODE
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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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@ -527,20 +569,17 @@ Calculate PSNR of compressed frames.
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Dump video coding statistics to @file{vstats_HHMMSS.log}.
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@item -vstats_file @var{file}
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Dump video coding statistics to @var{file}.
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@item -top @var{n}
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@item -top[:@var{stream_specifier}] @var{n} (@emph{output,per-stream})
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top=1/bottom=0/auto=-1 field first
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@item -dc @var{precision}
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Intra_dc_precision.
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@item -vtag @var{fourcc/tag}
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Force video tag/fourcc.
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@item -qphist
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Show QP histogram.
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@item -vtag @var{fourcc/tag} (@emph{output})
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Force video tag/fourcc. This is an alias for @code{-tag:v}.
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@item -qphist (@emph{global})
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Show QP histogram
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@item -vbsf @var{bitstream_filter}
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Bitstream filters available are "dump_extra", "remove_extra", "noise", "h264_mp4toannexb", "imxdump", "mjpegadump", "mjpeg2jpeg".
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@example
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ffmpeg -i h264.mp4 -vcodec copy -vbsf h264_mp4toannexb -an out.h264
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@end example
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@item -force_key_frames @var{time}[,@var{time}...]
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Deprecated see -bsf
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@item -force_key_frames[:@var{stream_specifier}] @var{time}[,@var{time}...] (@emph{output,per-stream})
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Force key frames at the specified timestamps, more precisely at the first
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frames after each specified time.
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This option can be useful to ensure that a seek point is present at a
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@ -551,46 +590,34 @@ The timestamps must be specified in ascending order.
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@section Audio Options
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@table @option
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@item -aframes @var{number}
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Set the number of audio frames to record.
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@item -ar @var{freq}
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@item -aframes @var{number} (@emph{output})
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Set the number of audio frames to record. This is an alias for @code{-frames:a}.
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@item -ar[:@var{stream_specifier}] @var{freq} (@emph{input/output,per-stream})
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Set the audio sampling frequency. For output streams it is set by
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default to the frequency of the corresponding input stream. For input
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streams this option only makes sense for audio grabbing devices and raw
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demuxers and is mapped to the corresponding demuxer options.
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@item -aq @var{q}
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Set the audio quality (codec-specific, VBR).
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@item -ac @var{channels}
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@item -aq @var{q} (@emph{output})
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Set the audio quality (codec-specific, VBR). This is an alias for -q:a.
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@item -ac[:@var{stream_specifier}] @var{channels} (@emph{input/output,per-stream})
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Set the number of audio channels. For output streams it is set by
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default to the number of input audio channels. For input streams
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this option only makes sense for audio grabbing devices and raw demuxers
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and is mapped to the corresponding demuxer options.
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@item -an
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@item -an (@emph{output})
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Disable audio recording.
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@item -acodec @var{codec}
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Force audio codec to @var{codec}. Use the @code{copy} special value to
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||||
specify that the raw codec data must be copied as is.
|
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@item -newaudio
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Add a new audio track to the output file. If you want to specify parameters,
|
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do so before @code{-newaudio} (@code{-acodec}, @code{-ab}, etc..).
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||||
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||||
Mapping will be done automatically, if the number of output streams is equal to
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the number of input streams, else it will pick the first one that matches. You
|
||||
can override the mapping using @code{-map} as usual.
|
||||
|
||||
Example:
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@example
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ffmpeg -i file.mpg -vcodec copy -acodec ac3 -ab 384k test.mpg -acodec mp2 -ab 192k -newaudio
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||||
@end example
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||||
@item -alang @var{code}
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Set the ISO 639 language code (3 letters) of the current audio stream.
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@item -acodec @var{codec} (@emph{input/output})
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Set the audio codec. This is an alias for @code{-codec:a}.
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@item -sample_fmt[:@var{stream_specifier}] @var{sample_fmt} (@emph{output,per-stream})
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Set the audio sample format. Use @code{-help sample_fmts} to get a list
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of supported sample formats.
|
||||
@end table
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||||
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||||
@section Advanced Audio options:
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||||
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||||
@table @option
|
||||
@item -atag @var{fourcc/tag}
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||||
Force audio tag/fourcc.
|
||||
@item -atag @var{fourcc/tag} (@emph{output})
|
||||
Force audio tag/fourcc. This is an alias for @code{-tag:a}.
|
||||
@item -audio_service_type @var{type}
|
||||
Set the type of service that the audio stream contains.
|
||||
@table @option
|
||||
|
|
@ -614,91 +641,93 @@ Voice Over
|
|||
Karaoke
|
||||
@end table
|
||||
@item -absf @var{bitstream_filter}
|
||||
Bitstream filters available are "dump_extra", "remove_extra", "noise", "mp3comp", "mp3decomp".
|
||||
Deprecated, see -bsf
|
||||
@end table
|
||||
|
||||
@section Subtitle options:
|
||||
|
||||
@table @option
|
||||
@item -scodec @var{codec}
|
||||
Force subtitle codec ('copy' to copy stream).
|
||||
@item -newsubtitle
|
||||
Add a new subtitle stream to the current output stream.
|
||||
@item -slang @var{code}
|
||||
Set the ISO 639 language code (3 letters) of the current subtitle stream.
|
||||
@item -sn
|
||||
@item -scodec @var{codec} (@emph{input/output})
|
||||
Set the subtitle codec. This is an alias for @code{-codec:s}.
|
||||
@item -sn (@emph{output})
|
||||
Disable subtitle recording.
|
||||
@item -sbsf @var{bitstream_filter}
|
||||
Bitstream filters available are "mov2textsub", "text2movsub".
|
||||
@example
|
||||
ffmpeg -i file.mov -an -vn -sbsf mov2textsub -scodec copy -f rawvideo sub.txt
|
||||
@end example
|
||||
Deprecated, see -bsf
|
||||
@end table
|
||||
|
||||
@section Audio/Video grab options
|
||||
|
||||
@table @option
|
||||
@item -vc @var{channel}
|
||||
Set video grab channel (DV1394 only).
|
||||
@item -tvstd @var{standard}
|
||||
Set television standard (NTSC, PAL (SECAM)).
|
||||
@item -isync
|
||||
@item -isync (@emph{global})
|
||||
Synchronize read on input.
|
||||
@end table
|
||||
|
||||
@section Advanced options
|
||||
|
||||
@table @option
|
||||
@item -map @var{input_file_id}.@var{input_stream_id}[:@var{sync_file_id}.@var{sync_stream_id}]
|
||||
@item -map [-]@var{input_file_id}[:@var{stream_specifier}][,@var{sync_file_id}[:@var{stream_specifier}]] (@emph{output})
|
||||
|
||||
Designate an input stream as a source for the output file. Each input
|
||||
Designate one or more input streams as a source for the output file. Each input
|
||||
stream is identified by the input file index @var{input_file_id} and
|
||||
the input stream index @var{input_stream_id} within the input
|
||||
file. Both indexes start at 0. If specified,
|
||||
@var{sync_file_id}.@var{sync_stream_id} sets which input stream
|
||||
file. Both indices start at 0. If specified,
|
||||
@var{sync_file_id}:@var{stream_specifier} sets which input stream
|
||||
is used as a presentation sync reference.
|
||||
|
||||
The @code{-map} options must be specified just after the output file.
|
||||
If any @code{-map} options are used, the number of @code{-map} options
|
||||
on the command line must match the number of streams in the output
|
||||
file. The first @code{-map} option on the command line specifies the
|
||||
The first @code{-map} option on the command line specifies the
|
||||
source for output stream 0, the second @code{-map} option specifies
|
||||
the source for output stream 1, etc.
|
||||
|
||||
A @code{-} character before the stream identifier creates a "negative" mapping.
|
||||
It disables matching streams from already created mappings.
|
||||
|
||||
For example, to map ALL streams from the first input file to output
|
||||
@example
|
||||
ffmpeg -i INPUT -map 0 output
|
||||
@end example
|
||||
|
||||
For example, if you have two audio streams in the first input file,
|
||||
these streams are identified by "0.0" and "0.1". You can use
|
||||
@code{-map} to select which stream to place in an output file. For
|
||||
these streams are identified by "0:0" and "0:1". You can use
|
||||
@code{-map} to select which streams to place in an output file. For
|
||||
example:
|
||||
@example
|
||||
ffmpeg -i INPUT out.wav -map 0.1
|
||||
ffmpeg -i INPUT -map 0:1 out.wav
|
||||
@end example
|
||||
will map the input stream in @file{INPUT} identified by "0.1" to
|
||||
will map the input stream in @file{INPUT} identified by "0:1" to
|
||||
the (single) output stream in @file{out.wav}.
|
||||
|
||||
For example, to select the stream with index 2 from input file
|
||||
@file{a.mov} (specified by the identifier "0.2"), and stream with
|
||||
index 6 from input @file{b.mov} (specified by the identifier "1.6"),
|
||||
@file{a.mov} (specified by the identifier "0:2"), and stream with
|
||||
index 6 from input @file{b.mov} (specified by the identifier "1:6"),
|
||||
and copy them to the output file @file{out.mov}:
|
||||
@example
|
||||
ffmpeg -i a.mov -i b.mov -vcodec copy -acodec copy out.mov -map 0.2 -map 1.6
|
||||
ffmpeg -i a.mov -i b.mov -c copy -map 0:2 -map 1:6 out.mov
|
||||
@end example
|
||||
|
||||
To add more streams to the output file, you can use the
|
||||
@code{-newaudio}, @code{-newvideo}, @code{-newsubtitle} options.
|
||||
To select all video and the third audio stream from an input file:
|
||||
@example
|
||||
ffmpeg -i INPUT -map 0:v -map 0:a:2 OUTPUT
|
||||
@end example
|
||||
|
||||
@item -map_meta_data @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
|
||||
Deprecated, use @var{-map_metadata} instead.
|
||||
To map all the streams except the second audio, use negative mappings
|
||||
@example
|
||||
ffmpeg -i INPUT -map 0 -map -0:a:1 OUTPUT
|
||||
@end example
|
||||
|
||||
@item -map_metadata @var{outfile}[,@var{metadata}]:@var{infile}[,@var{metadata}]
|
||||
Set metadata information of @var{outfile} from @var{infile}. Note that those
|
||||
are file indices (zero-based), not filenames.
|
||||
Optional @var{metadata} parameters specify, which metadata to copy - (g)lobal
|
||||
Note that using this option disables the default mappings for this output file.
|
||||
|
||||
@item -map_metadata[:@var{metadata_type}][:@var{index}] @var{infile}[:@var{metadata_type}][:@var{index}] (@emph{output,per-metadata})
|
||||
Set metadata information of the next output file from @var{infile}. Note that
|
||||
those are file indices (zero-based), not filenames.
|
||||
Optional @var{metadata_type} parameters specify, which metadata to copy - (g)lobal
|
||||
(i.e. metadata that applies to the whole file), per-(s)tream, per-(c)hapter or
|
||||
per-(p)rogram. All metadata specifiers other than global must be followed by the
|
||||
stream/chapter/program number. If metadata specifier is omitted, it defaults to
|
||||
stream/chapter/program index. If metadata specifier is omitted, it defaults to
|
||||
global.
|
||||
|
||||
By default, global metadata is copied from the first input file to all output files,
|
||||
By default, global metadata is copied from the first input file,
|
||||
per-stream and per-chapter metadata is copied along with streams/chapters. These
|
||||
default mappings are disabled by creating any mapping of the relevant type. A negative
|
||||
file index can be used to create a dummy mapping that just disables automatic copying.
|
||||
|
|
@ -706,12 +735,13 @@ file index can be used to create a dummy mapping that just disables automatic co
|
|||
For example to copy metadata from the first stream of the input file to global metadata
|
||||
of the output file:
|
||||
@example
|
||||
ffmpeg -i in.ogg -map_metadata 0:0,s0 out.mp3
|
||||
ffmpeg -i in.ogg -map_metadata 0:s:0 out.mp3
|
||||
@end example
|
||||
@item -map_chapters @var{outfile}:@var{infile}
|
||||
Copy chapters from @var{infile} to @var{outfile}. If no chapter mapping is specified,
|
||||
then chapters are copied from the first input file with at least one chapter to all
|
||||
output files. Use a negative file index to disable any chapter copying.
|
||||
@item -map_chapters @var{input_file_index} (@emph{output})
|
||||
Copy chapters from input file with index @var{input_file_index} to the next
|
||||
output file. If no chapter mapping is specified, then chapters are copied from
|
||||
the first input file with at least one chapter. Use a negative file index to
|
||||
disable any chapter copying.
|
||||
@item -debug @var{category}
|
||||
Print specific debug info.
|
||||
@var{category} is a number or a string containing one of the following values:
|
||||
|
|
@ -745,20 +775,18 @@ visualize block types
|
|||
@item vis_qp
|
||||
visualize quantization parameter (QP), lower QP are tinted greener
|
||||
@end table
|
||||
@item -benchmark
|
||||
@item -benchmark (@emph{global})
|
||||
Show benchmarking information at the end of an encode.
|
||||
Shows CPU time used and maximum memory consumption.
|
||||
Maximum memory consumption is not supported on all systems,
|
||||
it will usually display as 0 if not supported.
|
||||
@item -dump
|
||||
@item -dump (@emph{global})
|
||||
Dump each input packet.
|
||||
@item -hex
|
||||
@item -hex (@emph{global})
|
||||
When dumping packets, also dump the payload.
|
||||
@item -bitexact
|
||||
Only use bit exact algorithms (for codec testing).
|
||||
@item -ps @var{size}
|
||||
Set RTP payload size in bytes.
|
||||
@item -re
|
||||
@item -re (@emph{input})
|
||||
Read input at native frame rate. Mainly used to simulate a grab device.
|
||||
@item -loop_input
|
||||
Loop over the input stream. Currently it works only for image
|
||||
|
|
@ -804,11 +832,11 @@ Copy input stream time base from input to output when stream copying.
|
|||
Finish encoding when the shortest input stream ends.
|
||||
@item -dts_delta_threshold
|
||||
Timestamp discontinuity delta threshold.
|
||||
@item -muxdelay @var{seconds}
|
||||
@item -muxdelay @var{seconds} (@emph{input})
|
||||
Set the maximum demux-decode delay.
|
||||
@item -muxpreload @var{seconds}
|
||||
@item -muxpreload @var{seconds} (@emph{input})
|
||||
Set the initial demux-decode delay.
|
||||
@item -streamid @var{output-stream-index}:@var{new-value}
|
||||
@item -streamid @var{output-stream-index}:@var{new-value} (@emph{output})
|
||||
Assign a new stream-id value to an output stream. This option should be
|
||||
specified prior to the output filename to which it applies.
|
||||
For the situation where multiple output files exist, a streamid
|
||||
|
|
@ -819,10 +847,23 @@ an output mpegts file:
|
|||
@example
|
||||
ffmpeg -i infile -streamid 0:33 -streamid 1:36 out.ts
|
||||
@end example
|
||||
|
||||
@item -bsf[:@var{stream_specifier}] @var{bitstream_filters} (@emph{output,per-stream})
|
||||
Set bitstream filters for matching streams. @var{bistream_filters} is
|
||||
a comma-separated list of bitstream filters. Use the @code{-bsfs} option
|
||||
to get the list of bitstream filters.
|
||||
@example
|
||||
ffmpeg -i h264.mp4 -c:v copy -vbsf h264_mp4toannexb -an out.h264
|
||||
@end example
|
||||
@example
|
||||
ffmpeg -i file.mov -an -vn -sbsf mov2textsub -c:s copy -f rawvideo sub.txt
|
||||
@end example
|
||||
|
||||
@item -tag[:@var{stream_specifier}] @var{codec_tag} (@emph{output,per-stream})
|
||||
Force a tag/fourcc for matching streams.
|
||||
@end table
|
||||
|
||||
@section Preset files
|
||||
|
||||
A preset file contains a sequence of @var{option}=@var{value} pairs,
|
||||
one for each line, specifying a sequence of options which would be
|
||||
awkward to specify on the command line. Lines starting with the hash
|
||||
|
|
@ -854,7 +895,7 @@ directories, where @var{codec_name} is the name of the codec to which
|
|||
the preset file options will be applied. For example, if you select
|
||||
the video codec with @code{-vcodec libx264} and use @code{-vpre max},
|
||||
then it will search for the file @file{libx264-max.ffpreset}.
|
||||
@c man end
|
||||
@c man end OPTIONS
|
||||
|
||||
@chapter Tips
|
||||
@c man begin TIPS
|
||||
|
|
@ -894,11 +935,6 @@ To have a constant quality (but a variable bitrate), use the option
|
|||
'-qscale n' when 'n' is between 1 (excellent quality) and 31 (worst
|
||||
quality).
|
||||
|
||||
@item
|
||||
When converting video files, you can use the '-sameq' option which
|
||||
uses the same quality factor in the encoder as in the decoder.
|
||||
It allows almost lossless encoding.
|
||||
|
||||
@end itemize
|
||||
@c man end TIPS
|
||||
|
||||
|
|
@ -935,34 +971,8 @@ the DISPLAY environment variable.
|
|||
ffmpeg -f x11grab -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
|
||||
@end example
|
||||
|
||||
10 is the x-offset and 20 the y-offset for the grabbing.
|
||||
|
||||
@example
|
||||
ffmpeg -f x11grab -follow_mouse centered -s cif -r 25 -i :0.0 /tmp/out.mpg
|
||||
@end example
|
||||
|
||||
The grabbing region follows the mouse pointer, which stays at the center of
|
||||
region.
|
||||
|
||||
@example
|
||||
ffmpeg -f x11grab -follow_mouse 100 -s cif -r 25 -i :0.0 /tmp/out.mpg
|
||||
@end example
|
||||
|
||||
Only follows when mouse pointer reaches within 100 pixels to the edge of
|
||||
region.
|
||||
|
||||
@example
|
||||
ffmpeg -f x11grab -show_region 1 -s cif -r 25 -i :0.0+10,20 /tmp/out.mpg
|
||||
@end example
|
||||
|
||||
The grabbing region will be indicated on screen.
|
||||
|
||||
@example
|
||||
ffmpeg -f x11grab -follow_mouse centered -show_region 1 -s cif -r 25 -i :0.0 /tmp/out.mpg
|
||||
@end example
|
||||
|
||||
The grabbing region indication will follow the mouse pointer.
|
||||
|
||||
0.0 is display.screen number of your X11 server, same as the DISPLAY environment
|
||||
variable. 10 is the x-offset and 20 the y-offset for the grabbing.
|
||||
|
||||
@section Video and Audio file format conversion
|
||||
|
||||
|
|
@ -1030,7 +1040,7 @@ You can encode to several formats at the same time and define a
|
|||
mapping from input stream to output streams:
|
||||
|
||||
@example
|
||||
ffmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0
|
||||
ffmpeg -i /tmp/a.wav -map 0:a -b 64k /tmp/a.mp2 -map 0:a -b 128k /tmp/b.mp2
|
||||
@end example
|
||||
|
||||
Converts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. '-map
|
||||
|
|
@ -1041,7 +1051,7 @@ stream, in the order of the definition of output streams.
|
|||
You can transcode decrypted VOBs:
|
||||
|
||||
@example
|
||||
ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800k -g 300 -bf 2 -acodec libmp3lame -ab 128k snatch.avi
|
||||
ffmpeg -i snatch_1.vob -f avi -c:v mpeg4 -b:v 800k -g 300 -bf 2 -c:a libmp3lame -b:a 128k snatch.avi
|
||||
@end example
|
||||
|
||||
This is a typical DVD ripping example; the input is a VOB file, the
|
||||
|
|
@ -1085,16 +1095,11 @@ only formats accepting a normal integer are suitable.
|
|||
You can put many streams of the same type in the output:
|
||||
|
||||
@example
|
||||
ffmpeg -i test1.avi -i test2.avi -vcodec copy -acodec copy -vcodec copy -acodec copy test12.avi -newvideo -newaudio
|
||||
ffmpeg -i test1.avi -i test2.avi -map 0.3 -map 0.2 -map 0.1 -map 0.0 -c copy test12.nut
|
||||
@end example
|
||||
|
||||
In addition to the first video and audio streams, the resulting
|
||||
output file @file{test12.avi} will contain the second video
|
||||
and the second audio stream found in the input streams list.
|
||||
|
||||
The @code{-newvideo}, @code{-newaudio} and @code{-newsubtitle}
|
||||
options have to be specified immediately after the name of the output
|
||||
file to which you want to add them.
|
||||
The resulting output file @file{test12.avi} will contain first four streams from
|
||||
the input file in reverse order.
|
||||
|
||||
@end itemize
|
||||
@c man end EXAMPLES
|
||||
|
|
@ -1121,7 +1126,7 @@ ffplay(1), ffprobe(1), ffserver(1) and the FFmpeg HTML documentation
|
|||
@c man end
|
||||
|
||||
@c man begin AUTHORS
|
||||
The FFmpeg developers
|
||||
See git history
|
||||
@c man end
|
||||
|
||||
@end ignore
|
||||
|
|
|
|||
Loading…
Reference in New Issue