tree 5a4cb5facde515287c4c6294d820ae77031fc260
parent 3fffb88b0b52b299cb75d09934914ab858d542b6
author Jingning Han <jingning@google.com> 1519843424 -0800
committer Jingning Han <jingning@google.com> 1519916346 +0000

Enable adaptive txb search

Seach the transform block size and kernel type adaptively
conditioned on the relative rate distortion cost target. When the
rate distortion target is lower, the need for extensive transform
block partition and type search is relatively lower, hence allowing
to skip finer searches.

Enable this speed feature in speed 1. Local tests on bus_cif and
city_cif both at 1000 kbps at speed 1 showed that the encoder runs
40% - 50% faster.

bus_cif 30 frames: 1494s -> 1053s
city_cif 50 frames: 3210s -> 2328s

The compression performance changes are 0.048% for lowres and
0.091% for midres.

Change-Id: I9ac4b23d33488de0e4c3a089267aa08dab4ade5f