tree fae4dd1976bf2022e513b28986fa53f862702683
parent 734035f8897c789e37a30aa36b2e180803a73ca0
author Jingning Han <jingning@google.com> 1578094587 -0800
committer Jingning Han <jingning@google.com> 1578435204 +0000

Forward step motion search

Allow forward step motion search at highest search scale. This
improves the motion search quality. In speed 1, the coding performance
of vbr mode at 150 frames changes:

      avg PSNR     overall PSNR     SSIM
low   -0.051	    -0.048	   -0.032
mid   -0.091	    -0.079	   -0.100
hd    -0.117	    -0.175	   -0.149

Most clips remain neutral, several gain between 1 - 4% in PSNR.

STATS_CHANGED

Change-Id: Ia197d5394c4847436d05925639676c3d01a0c3b1