tree 5cec79a205a2d2b55f1d52a7c447892c97c529c4
parent d3ed898fb1e534b28df232c30cfc84f8a6cf9077
author Urvang Joshi <urvang@google.com> 1553284101 -0700
committer Urvang Joshi <urvang@google.com> 1554169011 +0000

Refine quality of keyframes for superres.

With this change, for video, enabling SUPERRES_QTHRESH for keyframes
only provides gains for some videos:
- hdres 60 frames (1 keyframe): -0.027
(sunflower_720p25.y4m: -0.435,
 jets_720p30.y4m: -0.255)
- lowres 150 frames (1 keyframe): 0.055
- midres 150 frames (1 keyframe): 0.031

Change-Id: I7232ea1e064f1057b39852ba910f544f4fcecdea