[FFmpeg-devel] [PATCH v1 2/2] avfilter/vf_minterpolate: change the default threshold to get better scenechange detect result

[lance.lmwang at gmail.com]

From: Limin Wang <lance.lmwang at gmail.com>

./ffmpeg -loglevel debug -i ../fate-suite/svq3/Vertical400kbit.sorenson3.mov -vf
minterpolate=fps=60:mi_mode=blend -an -f null -
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 1600
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 4120
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 5780
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 6700
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 8140
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 9740
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 14060
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 15680
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 18480
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 20020
[Parsed_minterpolate_0 @ 0x7fe7f3e193c0] scene changed, input pts 21740

The results are consistent with tests/ref/fate/filter-metadata-scenedetect

For the master, it'll detect more than 20 scene change for the same source.

Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
---
 libavfilter/vf_minterpolate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavfilter/vf_minterpolate.c b/libavfilter/vf_minterpolate.c
index fc8054b..c9ce804 100644
--- a/libavfilter/vf_minterpolate.c
+++ b/libavfilter/vf_minterpolate.c
@@ -230,7 +230,7 @@ static const AVOption minterpolate_options[] = {
     { "scd", "scene change detection method", OFFSET(scd_method), AV_OPT_TYPE_INT, {.i64 = SCD_METHOD_FDIFF}, SCD_METHOD_NONE, SCD_METHOD_FDIFF, FLAGS, "scene" },
         CONST("none",   "disable detection",                    SCD_METHOD_NONE,        "scene"),
         CONST("fdiff",  "frame difference",                     SCD_METHOD_FDIFF,       "scene"),
-    { "scd_threshold", "scene change threshold", OFFSET(scd_threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 5.0}, 0, 100.0, FLAGS },
+    { "scd_threshold", "scene change threshold", OFFSET(scd_threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100.0, FLAGS },
     { NULL }
 };
 
@@ -1097,6 +1097,7 @@ static void interpolate(AVFilterLink *inlink, AVFrame *avf_out)
     }
 
     if (mi_ctx->scene_changed) {
+        av_log(ctx, AV_LOG_DEBUG, "scene changed, input pts %"PRId64"\n", mi_ctx->frames[1].avf->pts);
         /* duplicate frame */
         av_frame_copy(avf_out, alpha > ALPHA_MAX / 2 ? mi_ctx->frames[2].avf : mi_ctx->frames[1].avf);
         return;
-- 
2.6.4