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lavfi/vf_decimate: do not compare the first frame to itself.

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This is a waste of computing power and will result to 0,
making it always dropped.
Use maximum difference values instead.
This commit is contained in:
Nicolas George 2015-10-24 19:43:55 +02:00
parent 35b0c7efda
commit 962727acb4
1 changed files with 6 additions and 3 deletions
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9
libavfilter/vf_decimate.c
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@ -167,9 +167,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
if (in) {
/* update frame metrics */
prv = dm->fid ? dm->queue[dm->fid - 1].frame : dm->last;
if (!prv)
prv = in;
calc_diffs(dm, &dm->queue[dm->fid], prv, in);
if (!prv) {
dm->queue[dm->fid].maxbdiff = INT64_MAX;
dm->queue[dm->fid].totdiff = INT64_MAX;
} else {
calc_diffs(dm, &dm->queue[dm->fid], prv, in);
}
if (++dm->fid != dm->cycle)
return 0;
av_frame_free(&dm->last);