tree f5e89a78809f2031ca27c37fc911b174ca69fa17
parent a883e6ea18b54e47d321c4ff4f1596c77896fe78
author Jingning Han <jingning@google.com> 1518137091 -0800
committer Jingning Han <jingning@google.com> 1518202043 +0000

Skip unnecessary single ref frame motion vector search

Change the reference motion vector search order to do the compound
mode first. Only proceed to do the single reference frame motion
vector search, when the compound frame type has less than 2 motion
vectors found. Tested on night_720p 800 kbps 50 frames, the decoding
process for ref mv system is sped up by 2X.

This is a non-normative change under opt-ref-mv flag.

Change-Id: I579f81b156a506aa4481cf8ed85d8b1e54d9e481