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avfilter/vf_mpdecimate: add comment about 8x8 SAD

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Peter Cordes 2015-03-04 03:35:36 -04:00 committed by Michael Niedermayer
parent 6590acf0fd
commit 3ad3529b56
1 changed files with 5 additions and 0 deletions
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5
libavfilter/vf_mpdecimate.c
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@ -120,6 +120,11 @@ static int decimate_frame(AVFilterContext *ctx,
return 0;
for (plane = 0; ref->data[plane] && ref->linesize[plane]; plane++) {
/* use 8x8 SAD even on subsampled planes. The blocks won't match up with
* luma blocks, but hopefully nobody is depending on this to catch
* localized chroma changes that wouldn't exceed the thresholds when
* diluted by using what's effectively a larger block size.
*/
int vsub = plane == 1 || plane == 2 ? decimate->vsub : 0;
int hsub = plane == 1 || plane == 2 ? decimate->hsub : 0;
if (diff_planes(ctx,