tree c9c4838405f185adde18b7777b113bcd727627ff
parent 3d1e8c9a85d0bb16049cb1622f1d2d9a034c5379
author Paul Wilkins <paulwilkins@google.com> 1415377970 +0000
committer Paul Wilkins <paulwilkins@google.com> 1416529415 -0800

Add variance restriction to AQ2.

Add an additional restriction to bit/complexity based
segmentation based on spatial variance.

Only lower Q when both the number of bits spent
in the initial encoding pass and the spatial complexity are
below a threshold. This will prevent the low Q segments
being used just because there is a surfeit of bits.

Small metrics gains especially opsnr.
derf ~0.2% std-hd ~0.3%

Change-Id: I6a8496d466d673f9b0e2b2ca6304ea7b6d8e1cce