[FFmpeg-devel] [PATCH v2] avfilter/f_select: yuv will use Y plane only for scenecut detect

[Limin Wang]

On Mon, Aug 12, 2019 at 11:03:24PM +0200, Marton Balint wrote:
> 
> 
> On Mon, 12 Aug 2019, lance.lmwang at gmail.com wrote:
> 
> >From: Limin Wang <lance.lmwang at gmail.com>
> >
> >Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> >---
> >libavfilter/f_select.c                     |  3 ++-
> >tests/ref/fate/filter-metadata-scenedetect | 16 ++++++++--------
> >2 files changed, 10 insertions(+), 9 deletions(-)
> >
> >diff --git a/libavfilter/f_select.c b/libavfilter/f_select.c
> >index 5c7372c976..25a36ff0fa 100644
> >--- a/libavfilter/f_select.c
> >+++ b/libavfilter/f_select.c
> >@@ -211,7 +211,8 @@ static int config_input(AVFilterLink *inlink)
> >    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
> >
> >    select->bitdepth = desc->comp[0].depth;
> >-    select->nb_planes = av_pix_fmt_count_planes(inlink->format);
> >+    select->nb_planes = desc->flags & AV_PIX_FMT_FLAG_PLANAR ? 1 : av_pix_fmt_count_planes(inlink->format);
> >+
> 
> This is very misleading even if it happens to work for the currently
> supported formats.
> 
> An is_yuv variable is good to have, because it says what we want,
> which is limit the number of planes only for YUV. So please use the
> previosuly suggested
> 
>     int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
>                  (desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
>                  desc->nb_components >= 3;
> 

OK, it's more clean, please checking the last update version.(please ignore the first two)


> (copied from tiff.c by the way) definition.
> 
> Thanks,
> Marton
> 
> 
> >    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;
> >diff --git a/tests/ref/fate/filter-metadata-scenedetect b/tests/ref/fate/filter-metadata-scenedetect
> >index 7ce2d6794e..36c033bc0e 100644
> >--- a/tests/ref/fate/filter-metadata-scenedetect
> >+++ b/tests/ref/fate/filter-metadata-scenedetect
> >@@ -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
> >-- 
> >2.21.0
> >
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