shithub: libvpx

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Fix in key frame detection

The frame next to scene cut frame does not usually have
a high second ref useage. Thus the sec ref useage of the
frame next to scene cut frame is tested against a
threshold for scene cut detection.

With this change scene cut detection is improved for
contents where genuine scene cuts were being missed.

Change-Id: I11190d848fa1c1dcd63aab81da799354371e2a30

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -2820,7 +2820,7 @@

   // See above for an explanation of the test criteria.

   // If so, then examine how well it predicts subsequent frames.

   if (!detect_flash(twopass, -1) && !detect_flash(twopass, 0) &&

-      (this_frame->pcnt_second_ref < SECOND_REF_USEAGE_THRESH) &&

+      (next_frame->pcnt_second_ref < SECOND_REF_USEAGE_THRESH) &&

       ((this_frame->pcnt_inter < VERY_LOW_INTER_THRESH) ||

        (slide_transition(this_frame, last_frame, next_frame)) ||

        (intra_step_transition(this_frame, last_frame, next_frame)) ||