commit 2e53e9e53ff00113dc8a9952d596020c648f13db
author Yaowu Xu <yaowu@google.com> Thu Oct 14 18:58:34 2010 -0700
committer Yaowu Xu <yaowu@google.com> Fri Oct 15 10:14:34 2010 -0700
tree 81f3a38a4199f2984169976031cad5a18bf72d6e
parent a2b598a2f964b0d7a1e5df74b66c70a1bca746ca

change to make use of more trellis quantization

when a subsequent frame is encoded as an alt reference frame, it is
unlikely that any mb in current frame will be used as reference for
future frames, so we can enable quantization optimization even when
the RD constant is slightly rate-biased. The change has an overall
benefit between 0.1% to 0.2% bit savings on the test sets based on
vpxssim scores.

Change-Id: I9aa7bc5cd573ea84e3ee655d2834c18c4460ceea