tree 76aef2c815e5b76479dab73647fe600286fe9900
parent 76930e9156df0acce1aeb171dd28758a095f1d33
author yjshen <yjshen@google.com> 1581358599 -0800
committer yjshen <yjshen@google.com> 1586893379 -0700

Unify two strategies for temporal filtering.

Currently, there are two strategies for temporal filtering, i.e., YUV
and plane-wise. The difference is that YUV is mostly used for lowres
videos while plane-wise is commonly used for midres and hdres.

This CL unifies the filtering strategies. After recent improvements on
plane-wise stragegy, it shows better performance on lowres videos than
YUV strategy. So, to simplify the filtering process, we always choose
the plane-wise stragegy regardless of the video resolution.

See https://aomedia-review.googlesource.com/c/aom/+/108961 and
https://aomedia-review.googlesource.com/c/aom/+/108965 for the
improvements on plane-wise strategy.

NOTE: This CL only affects the performance on lowres datasets.

Experimental results:

Under Speed-4 (two-pass mode):
          avg PSNR   ovr PSNR     SSIM
ugc360p     -0.180     -0.180   -0.094
lowres      -0.044     -0.227   -0.189
lowres2     -0.040     -0.184   -0.185

Under Speed-1 (two-pass mode):
          avg PSNR   ovr PSNR     SSIM
ugc360p     -0.210     -0.236   -0.108
lowres      -0.014     -0.161   -0.118
lowres2      0.086     -0.042   -0.016

STATS_CHANGED

Change-Id: I73687c363bcc077b7383aea117d4703be62cf6fb