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document vf_decimate 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10280 b3059339-0415-0410-9bf9-f77b7e298cf2
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rfelker 2003-06-11 02:28:13 +00:00
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@ -2583,6 +2583,23 @@ This filter packs the planar 4:2:0 data into YUY2 (4:2:2) format with
the chroma lines in their proper locations, so that in any given
scanline, the luma and chroma data both come from the same field.
.TP
.B decimate[=max:hi:lo:frac]
Drops frames that don't differ greatly from the previous frame in
order to reduce framerate.
The argument max (if positive) sets the maximum number of consecutive
frames which can be dropped, or (if negative) the minimum interval
between dropped frames.
A frame is a candidate for dropping if no 8x8 region differs by more
than a threshold of hi, and if not more than frac portion (1 meaning
the whole image) differs by more than a threshold of lo.
Values of hi and lo are for 8x8 pixel blocks and represent actual
pixel value differences, so a threshold of 64 corresponds to 1 unit of
difference for each pixel, or the same spread out differently over the
block.
The main use of this filter is for very-low-bitrate encoding (e.g.
streaming over dialup modem), but it could in theory be used for
fixing movies that were inverse-telecined incorrectly.
.TP
.B dint[=sense:level]
Detects and drops first of interlaced frames in video stream.
Values can be from 0.0 to 1.0 - first (default 0.1) is relative difference