shithub: libvpx

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Fix issue with short static KF groups.

Where a KF group is very short but static make sure
it is coded as a single GF group. Previously there was a
bug where such groups could be coded as an arf group
with the arf in the next scene.

Change-Id: I4504ae2b03c4877fcecfa58dd503879aa4eefac4

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

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

@@ -2917,6 +2917,7 @@

   // Should we use the alternate reference frame.

   if ((zero_motion_accumulator < 0.995) && allow_alt_ref &&

+      (twopass->kf_zeromotion_pct < STATIC_KF_GROUP_THRESH) &&

       (i < cpi->oxcf.lag_in_frames) && (i >= rc->min_gf_interval)) {

     const int forward_frames = (rc->frames_to_key - i >= i - 1)

                                    ? i - 1