shithub: libvpx

Download patch

ref: eff68a3a4df99b8f475a1e3e5eb842bcb928fe00
parent: a3128ad33af5a348269c01c3fd3c30a1d8d53f39
author: Jerome Jiang <[email protected]>
date: Mon Nov 14 05:22:00 EST 2016

vp9: Speed 8: Turn off 4x4avg for low-res non-key frames.

Changes only affects speed = 8 for low resolutions.

Metrics for avgPSNR/SSIM on rtc_derf (low resolutions) show loss of
0.5/0.6%.
On Nexus 6, the encoding time is reduced by ~5.9% on average across all
low-res clips.
Visually little/no change on rtc_derf clips.

Change-Id: I68dd50e558d72dcc1af8317d224bfae5e3bd872d

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -834,8 +834,8 @@

     }

   }

-  threshold_4x4avg =

-      (cpi->oxcf.speed < 8) ? thresholds[1] << 1 : thresholds[2] >> 1;

+  // For non keyframes, disable 4x4 average for low resolution when speed = 8

+  threshold_4x4avg = (cpi->oxcf.speed < 8) ? thresholds[1] << 1 : INT64_MAX;

   memset(x->variance_low, 0, sizeof(x->variance_low));