tree ce6cc077176b276ce3c2babfda1f6e63b915730d
parent fda31aab74a937a986d50557de098483bf6655ea
author Urvang Joshi <urvang@google.com> 1563231217 -0700
committer Urvang Joshi <urvang@google.com> 1563337729 +0000

Scene-cut detection: avoid very short KF intervals

In some videos with camera panning, scene cut algo incorrectly
identifies a scene cut after just a couple of frames.

We force a bigger keyframe interval to avoid this issue.

Large BDRate improvement on selected videos:
hdres/shields_720p50.y4m:       -10.717
hdres/stockholm_ter_720p60.y4m: -10.312
hdres/parkrun_720p50.y4m:       -3.501
hdres/mobcal_720p50.y4m:        -2.405
(other hdres vids neutral)

hdres overall: -0.709

lowres, midres, ugc360p and objective1-fast all neutral.

STATS_CHANGED

Change-Id: I601a306d2657f74ca8ebf5105f4cbf02121bf0ce