commit b04d766800f39ed97361d2ec13b740cbf5bca534
author Yunqing Wang <yunqingwang@google.com> Thu May 29 16:53:23 2014 -0700
committer Yunqing Wang <yunqingwang@google.com> Mon Jun 09 08:26:50 2014 -0700
tree cf870cdf53eae74616540c28f6847b812d0d8d13
parent 61c4295af8c56c3dbe3a97a8a80a29099e587c69

Use small transform size in non-rd real-time mode

In non-rd real-time mode, choosing smaller transform size in
encoding gives better video quality and good speed gain than
choosing larger transform size. This patch set tx size search
method to ALLOW_8X8, which is better than using 4x4 or other
larger sizes.

Borg tests on rtc set at speed 6 showed significant gain on quality.
PSNR gain: 11.034% and SSIM gain: 15.466%.

The speed gain is 5% - 12% for <720p clips, and 2% - 7% for
720p clips.

Change-Id: If4dc74ed2df359346b059f47fb73b4a0193ec548