tree 1363f3b61d6ae31eb863f8b3d8bc625c61f246e7
parent 92a926a28c9a57515fc1ed7d58e1d4c1b4c7f56d
author sdeng <sdeng@google.com> 1582066260 -0800
committer Sai Deng <sdeng@google.com> 1582565859 +0000

Add variance aware VMAF video pre-processing

Also reduce VMAF calculations in block based preprocessing by using
blocks instead of the whole frame to calculate VMAFs.

Encoding speed improvements
---------------------------
perf stat -e instructions:u ./aomenc red_kayak_480p.y4m --limit=30
 -o output --tune=vmaf --cpu-used=1
Before
 2,105,874,102,352      instructions:u
     233.762592458 seconds time elapsed
     372.785486000 seconds user
      50.613502000 seconds sys
After
 1,402,301,529,023      instructions:u
     154.332533799 seconds time elapsed
     261.826206000 seconds user
      76.290570000 seconds sys

BD-rate reduction
-----------------
baseline: tune=vmaf_with_preprocessing
midres -1.22% hdres(90% done) -0.89%

baseline: tune=vmaf
midres -0.97% hdres(95% done) -0.27%

Change-Id: I784ef7246804f3add813b0c8b458491a22cc08d7