ref: 57c6bf291e41d4e857df621bd3a9d00341a23a02
parent: cdbd89197ec878c9c9fed8876c5c3f436ae8994d
author: Marco <marpan@google.com>
date: Tue Aug 2 13:37:32 EDT 2016
1 pass vbr: Allow for lookahead alt-ref in real-time mode. For 1 pass vbr real-time mode: Allow for the usage of alt-ref frame when non-zero lag-in-frames is used. Use non-filtered alt-ref, and select usage based on fast scene/content analysis/detection within the lag of frames. Positive gains on ytlive set: overall avgPSNR ~3-4%. Several clips are up between 5-14%, a few clips are neutral/small change. Current speed decrease is about ~5-10%. Use the flag USE_ALTREF_FOR_ONE_PASS to enable this feature (off by default for now). Change-Id: I802d2bf3d44f9cf01f6d15c76be9c90192314769