tree da0ea94ff5d040babbb9b129d022d84964ea8b35
parent 0e8b6ed74398f5bf7a31604a30726e3bbdb5bd3d
author Cheng Chen <chengchen@google.com> 1564598109 -0700
committer Cheng Chen <chengchen@google.com> 1564880278 -0700

Remove average accumulated decay

The variable |av_decay_accumulator| restricts the boost of the key
frame. But its logic is not crystal clear.
Removing it makes the logic easier to understand.
And at the same time, removing it provides gains.

The potential downside is now key frame gets more boost.
Not a good news for rate control.

Test on 150 frames, spd1:
 VBR     Avg_psnr        ovr_psnr           ssim
Lowres     0.14            0.22             -0.02
Midres    -0.31           -0.35             -0.87
Hdres     -0.38           -0.33             -0.61

 Q       Avg_psnr        ovr_psnr           ssim
Lowres     0.03            0.05             -0.17
Midres    -0.22           -0.19             -0.61
Hdres     -0.32           -0.30             -0.46

STATS_CHANGED

Change-Id: I264dcd3da9987591f565f1a8eb8c18e2d160b47a