commit 9c915757e556d5df75400a6b847c37f06a71a426
author Marco Paniconi <marpan@google.com> Thu Jan 19 01:00:36 2023 -0800
committer Marco Paniconi <marpan@google.com> Fri Jan 20 18:41:56 2023 +0000
tree 452a9ee531942e2b3dfd8db99c05a539c0c7a611
parent ea72639373c664746453c13d036032f5975c6136

rtc-screen: Fix color artifact via color_sensitivity

Reduce the threshold (increase the shift) for setting
the color_sensitivity to 0 at superblock level on
scene/slide changes. On scene/slide changes better to
be much more conservative in setting this flag to 0/off.

This removes/reduces bad color artifact in
sc_web_browsing720p on slide change (wrong color
blocks appear in some areas).

Stats changed
For speed 10 screen:
avg/ovr/ssim, speedup(IC): -0.18/-0.43/-0.32, -0.50

bdrate gains on two clips where this change has effect:
sc_eb_browsing720p: -0.27/-0.36/-0.34
screenshare_buganizer: -1.5/-1.8/-1.3

Change-Id: I6a415599459365478f9ad9053b33e61f4f6afb66

av1/encoder/var_based_part.c

diff --git a/av1/encoder/var_based_part.c b/av1/encoder/var_based_part.c
index 995b64e..52d8365 100644
--- a/av1/encoder/var_based_part.c
+++ b/av1/encoder/var_based_part.c
@@ -997,7 +997,7 @@
 
   if (cpi->oxcf.tune_cfg.content == AOM_CONTENT_SCREEN &&
       cpi->rc.high_source_sad)
-    shift = 5;
+    shift = 7;
 
   MB_MODE_INFO *mi = xd->mi[0];
   const AV1_COMMON *const cm = &cpi->common;