tree c7edec344dfa762b2eddac8dc7f6e9488e1f9355
parent 27aa84463d241054885c900a50fabc2393ddedbb
author Yunqing Wang <yunqingwang@google.com> 1578332462 -0800
committer Yunqing Wang <yunqingwang@google.com> 1578370454 -0800

Temporal filter 1 more alt ref frame

Temporal filter the second alt ref frame if its distance >= 7. This
second alt ref frame is always a show existing frame. Finally, use
conditions to decide if or not to accept this filtered alt ref.

This change is controlled by a speed feature.
At speed 1, borg test result:
       avg_psnr:  ovr_psnr:  ssim:  vmaf:
lowres: -0.112    -0.189    -0.064  -0.477
midres: -0.052    -0.139    -0.068  -0.196

STATS_CHANGED

Change-Id: I9608a0586073d44b60bc4fe3e8eeec97f9fa7df2