tree 51af9f65b7ba65678f24f2bd014ee4f17dc0ea92
parent 9e88f16e0db346ebec85950dd106144439338d4d
author Jingning Han <jingning@google.com> 1600290122 -0700
committer Jingning Han <jingning@google.com> 1600805632 +0000

Align rate allocation strategy within a GOP

Avoid unintended change of the bit allocation strategy in GOP
process re-design.

The collective changes clarify the usage of first-pass stats
and other frame alignments. The compression performance is
changed:

In VBR mode, 150 frames, speed 1
          Avg PSNR  Overall PSNR  SSIM
Lowres   -0.031	     -0.086	-0.234
Midres2   0.406	      0.331	 0.389
Ugc360p   0.084	     -0.095	-0.373
Ugc480p  -0.020	      0.002      0.050

In Q mode, 150 frames, speed 1
          Avg PSNR  Overall PSNR  SSIM
Lowres   -0.013	    -0.042.     -0.056
Midres2   0.422	     0.301	 0.353
Ugc360p  -0.121	    -0.034	-0.057
Ugc480p  -0.307	    -0.291	-0.50

Note that ugc480p is a new test set that has not been used
as training data.

STATS_CHANGED

Change-Id: I8954b655aadd73e3985c43ce2026ce640ea6787d