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avfilter/f_select: yuv will use Y plane only for scenecut detect

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At the moment scene change detection score uses all planes to detect scene
changes. In this regard this is similar how the frozen frames detection works.
However, in classic encoding scene change detection typically only uses the Y
plane.

We might get more resonable scores for scene change if we also use only
the Y plane for calculating the score if the pixel format is YUV. Although
this will require additional work once packed YUV formats are added,
because for the moment the generic scene sad score calculation has no way
to ignore some components in a packed format.

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Limin Wang 2019-08-13 09:39:47 +08:00 committed by Marton Balint
parent c294f38c91
commit ad3ef00ce5
2 changed files with 13 additions and 9 deletions
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6
libavfilter/f_select.c
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@ -209,9 +209,13 @@ static int config_input(AVFilterLink *inlink)
{
SelectContext *select = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
(desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
desc->nb_components >= 3;
select->bitdepth = desc->comp[0].depth;
select->nb_planes = av_pix_fmt_count_planes(inlink->format);
select->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format);
for (int plane = 0; plane < select->nb_planes; plane++) {
ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane);
int vsub = desc->log2_chroma_h;

16
tests/ref/fate/filter-metadata-scenedetect
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@ -1,11 +1,11 @@
pkt_pts=1620|tag:lavfi.scene_score=1.000000
pkt_pts=4140|tag:lavfi.scene_score=0.668643
pkt_pts=5800|tag:lavfi.scene_score=0.996721
pkt_pts=6720|tag:lavfi.scene_score=0.357390
pkt_pts=8160|tag:lavfi.scene_score=0.886268
pkt_pts=9760|tag:lavfi.scene_score=0.926219
pkt_pts=14080|tag:lavfi.scene_score=0.650033
pkt_pts=4140|tag:lavfi.scene_score=0.923403
pkt_pts=5800|tag:lavfi.scene_score=1.000000
pkt_pts=6720|tag:lavfi.scene_score=0.475643
pkt_pts=8160|tag:lavfi.scene_score=1.000000
pkt_pts=9760|tag:lavfi.scene_score=1.000000
pkt_pts=14080|tag:lavfi.scene_score=0.874623
pkt_pts=15700|tag:lavfi.scene_score=1.000000
pkt_pts=18500|tag:lavfi.scene_score=0.316402
pkt_pts=20040|tag:lavfi.scene_score=0.269509
pkt_pts=18500|tag:lavfi.scene_score=0.422509
pkt_pts=20040|tag:lavfi.scene_score=0.352360
pkt_pts=21760|tag:lavfi.scene_score=1.000000