vp9: Incorporate source sum_diff into non-rd partition thresholds.
Increase the variance partition thresholds for superblocks that have low sum-diff (from source analysis prior to encoding frame). Use it for now only for speed >= 7 or for denoising on. Small change on metrics for rtc set: less than ~0.1 avgPNSR decrease on RTC set, for both speed 7 and 8. Change-Id: I38325046ebd5f371f51d6e91233d68ff73561af1
Showing with 90 additions and 37 deletions