commit b86730bfae5c9d3f09cd709d8a852da31641b2fa
author Yunqing Wang <yunqingwang@google.com> Fri Aug 12 11:54:32 2022 -0700
committer Yunqing Wang <yunqingwang@google.com> Tue Aug 16 00:24:45 2022 +0000
tree a789cd5cd15d16633ad5d02221835c0ff64b6482
parent 3af3c1bd5a1693ab887b94d0d5c0bf436fbabacf

Use NEARESTMV mode in SC static area encoding

In RTC screen content encoding, use NEARESTMV mode instead of
only using GLOBALMV to improve BD-rate saving.

Borg test results on rtc_screen set:
         avg_psnr:  ovr_psnr:   ssim:   encoding_spdup:
speed 9:  -0.858     -0.796    -0.735     0.115
speed 10: -0.757     -1.889    -1.685    -0.318

STATS_CHANGED for SC

Change-Id: I483499e164287a7a6bcbf49d26a129909c45958a

av1/encoder/nonrd_pickmode.c

diff --git a/av1/encoder/nonrd_pickmode.c b/av1/encoder/nonrd_pickmode.c
index f188f0e..29cc7aa 100644
--- a/av1/encoder/nonrd_pickmode.c
+++ b/av1/encoder/nonrd_pickmode.c
@@ -2955,7 +2955,10 @@
     if (!use_ref_frame_mask[ref_frame]) continue;
 
     if (x->force_zeromv_skip &&
-        (this_mode != GLOBALMV || ref_frame != LAST_FRAME))
+        ((!(this_mode == NEARESTMV &&
+            frame_mv[this_mode][ref_frame].as_int == 0) &&
+          this_mode != GLOBALMV) ||
+         ref_frame != LAST_FRAME))
       continue;
 
     force_mv_inter_layer = 0;