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document harddup and softskip

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@12339 b3059339-0415-0410-9bf9-f77b7e298cf2
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rfelker 2004-04-28 04:40:37 +00:00
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@ -2896,6 +2896,25 @@ The optional argument selects the sampling mode.
By default, linear interpolation (mode 1) is used.
Mode 0 uses nearest-neighbor sampling, which is fast but incorrect.
.TP
.B harddup
Only useful with MEncoder.
If harddup is used when encoding, it will force duplicate frames to be
encoded in the output.
This uses slightly more space, but is necessary for output to MPEG
files or if you plan to demux and remux the video stream after
encoding.
Should be placed at or near the end of the filter chain unless you
have a good reason to do otherwise.
.TP
.B softskip
Only useful with MEncoder.
Softskip moves the frame skipping (dropping) step of encoding from
before the filter chain to some point during the filter chain.
This allows filters which need to see all frames (inverse telecine,
temporal denoising, etc.) to function properly.
Should be placed after the filters which need to see all frames and
before any subsequent filters that are cpu-intensive.
.TP
.B decimate[=max:hi:lo:frac]
Drops frames that don't differ greatly from the previous frame in
order to reduce framerate.