From 3ad3529b567e04a812c0ff103855ecba3efff900 Mon Sep 17 00:00:00 2001 From: Peter Cordes Date: Wed, 4 Mar 2015 03:35:36 -0400 Subject: [PATCH] avfilter/vf_mpdecimate: add comment about 8x8 SAD Signed-off-by: Michael Niedermayer --- libavfilter/vf_mpdecimate.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libavfilter/vf_mpdecimate.c b/libavfilter/vf_mpdecimate.c index cb3e69fd92..7cc32547ff 100644 --- a/libavfilter/vf_mpdecimate.c +++ b/libavfilter/vf_mpdecimate.c @@ -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,