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152 lines
5.5 KiB
ReStructuredText
152 lines
5.5 KiB
ReStructuredText
ENCODING
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========
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You can encode files from one format/codec to another using this facility.
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``-o <filename>``
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Enables encoding mode and specifies the output file name.
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``--of=<format>``
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Specifies the output format (overrides autodetection by the file name
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extension of the file specified by ``-o``). This can be a comma separated
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list of possible formats to try. See ``--of=help`` for a full list of
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supported formats.
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``--ofopts=<options>``
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Specifies the output format options for libavformat.
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See ``--ofopts=help`` for a full list of supported options.
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Options are managed in lists. There are a few commands to manage the
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options list.
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``--ofopts-add=<options1[,options2,...]>``
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Appends the options given as arguments to the options list.
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``--ofopts-pre=<options1[,options2,...]>``
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Prepends the options given as arguments to the options list.
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``--ofopts-del=<index1[,index2,...]>``
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Deletes the options at the given indexes. Index numbers start at 0,
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negative numbers address the end of the list (-1 is the last).
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``--ofopts-clr``
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Completely empties the options list.
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``--ofps=<float value>``
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Specifies the output format time base (default: 24000). Low values like 25
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limit video fps by dropping frames.
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``--oautofps``
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Sets the output format time base to the guessed frame rate of the input
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video (simulates mencoder behavior, useful for AVI; may cause frame drops).
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Note that not all codecs and not all formats support VFR encoding, and some
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which do have bugs when a target bitrate is specified - use ``--ofps`` or
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``--oautofps`` to force CFR encoding in these cases.
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``--omaxfps=<float value>``
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Specifies the minimum distance of adjacent frames (default: 0, which means
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unset). Content of lower frame rate is not readjusted to this frame rate;
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content of higher frame rate is decimated to this frame rate.
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``--oharddup``
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If set, the frame rate given by ``--ofps`` is attained not by skipping time
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codes, but by duplicating frames (constant frame rate mode).
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``--oneverdrop``
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If set, frames are never dropped. Instead, time codes of video are
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readjusted to always increase. This may cause AV desync, though; to work
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around this, use a high-fps time base using ``--ofps`` and absolutely
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avoid ``--oautofps``.
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``--oac=<codec>``
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Specifies the output audio codec. This can be a comma separated list of
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possible codecs to try. See ``--oac=help`` for a full list of supported
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codecs.
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``--oaoffset=<value>``
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Shifts audio data by the given time (in seconds) by adding/removing
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samples at the start.
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``--oacopts=<options>``
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Specifies the output audio codec options for libavcodec.
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See ``--oacopts=help`` for a full list of supported options.
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.. admonition:: Example
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"``--oac=libmp3lame --oacopts=b=128000``"
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selects 128kbps MP3 encoding.
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Options are managed in lists. There are a few commands to manage the
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options list.
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``--oacopts-add=<options1[,options2,...]>``
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Appends the options given as arguments to the options list.
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``--oacopts-pre=<options1[,options2,...]>``
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Prepends the options given as arguments to the options list.
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``--oacopts-del=<index1[,index2,...]>``
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Deletes the options at the given indexes. Index numbers start at 0,
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negative numbers address the end of the list (-1 is the last).
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``--oacopts-clr``
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Completely empties the options list.
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``--oafirst``
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Force the audio stream to become the first stream in the output. By default
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the order is unspecified.
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``--ovc=<codec>``
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Specifies the output video codec. This can be a comma separated list of
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possible codecs to try. See ``--ovc=help`` for a full list of supported
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codecs.
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``--ovoffset=<value>``
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Shifts video data by the given time (in seconds) by shifting the pts
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values.
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``--ovcopts <options>``
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Specifies the output video codec options for libavcodec.
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See --ovcopts=help for a full list of supported options.
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.. admonition:: Examples
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``"--ovc=mpeg4 --oacopts=qscale=5"``
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selects constant quantizer scale 5 for MPEG-4 encoding.
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``"--ovc=libx264 --ovcopts=crf=23"``
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selects VBR quality factor 23 for H.264 encoding.
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Options are managed in lists. There are a few commands to manage the
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options list.
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``--ovcopts-add=<options1[,options2,...]>``
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Appends the options given as arguments to the options list.
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``--ovcopts-pre=<options1[,options2,...]>``
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Prepends the options given as arguments to the options list.
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``--ovcopts-del=<index1[,index2,...]>``
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Deletes the options at the given indexes. Index numbers start at 0,
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negative numbers address the end of the list (-1 is the last).
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``--ovcopts-clr``
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Completely empties the options list.
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``--ovfirst``
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Force the video stream to become the first stream in the output. By default
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the order is unspecified.
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``--ocopyts``
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Copies input pts to the output video (not supported by some output
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container formats, e.g. AVI). Discontinuities are still fixed.
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By default, audio pts are set to playback time and video pts are
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synchronized to match audio pts, as some output formats do not support
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anything else.
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``--orawts``
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Copies input pts to the output video (not supported by some output
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container formats, e.g. AVI). In this mode, discontinuities are not fixed
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and all pts are passed through as-is. Never seek backwards or use multiple
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input files in this mode!
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