tree 71239b65cd0e1953e981856a98c18c3aacc11638
parent fda7dcb132e7bd4e3a5831ba7f56bb5233262085
author Debargha Mukherjee <debargha@google.com> 1547507749 -0800
committer Debargha Mukherjee <debargha@google.com> 1547709703 +0000

Specialize the curvfit / surface fit rate models

The rate models for the curvfit and surffit models are
specialized by block size, by dividing the block sizes
into 4 categories. The prediction error for rate is
reduced substantially in the process.

Note there is much less improvement in distortion by
the same process and so a generic model for all block
sizes are still used for distortion. However the
distortion model for surffit is also updated by sampling
a little more coarsely than before.

lowres 20 frames end-usage=q: +0.023% av PSNR
midres 20 frames end-usage=q: -0.053% av PSNR

Upto 3% speed-up but bot consistently across all videos.

STATS_CHANGED

Change-Id: I1ef7335b2e40308e11790dd9fc13d062d4fc81c1