shithub: libvpx

Download patch

ref: 7c69136494b02709acbf96f017d3dec4f37564c4
parent: d1e963540284ad90bac1f03fb02b06fad327667a
author: Marco <marpan@google.com>
date: Tue Jan 23 15:03:19 EST 2018

vp9-svc: Re-adjust some aq-mode=3 control parameters.

Remove an adjustment to two cyclic refresh (aq-mode= 3)
parameters for SVC. The adjustment was to reduce the
delta-qp on second segment, and reduce the motion threshold.
This was done early on in the SVC encoder development,
in the latest codebase removing this adjustment yields
some improvements in metrics.

The avgPSNR/SSIM metrics increase on average by ~1%
(most clip positive gain), for 3 and 2 layer SVC.

Change-Id: I7a4d5114f16b2a1df383dbe6b3fe02940e29e6cc

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -464,10 +464,6 @@

       cr->rate_ratio_qdelta = VPXMAX(cr->rate_ratio_qdelta, 2.5);

     }

   }

-  if (cpi->svc.spatial_layer_id > 0) {

-    cr->motion_thresh = 4;

-    cr->rate_boost_fac = 12;

-  }

   if (cpi->oxcf.rc_mode == VPX_VBR) {

     // To be adjusted for VBR mode, e.g., based on gf period and boost.

     // For now use smaller qp-delta (than CBR), no second boosted seg, and