Reduce screen content psnr threshold slightly
On chinaspeed_xga, the PSNR difference between screen-content coded
keyframe and non-screen-content coded keyframe is about 1.0dB, which is
the current threshold. This causes some large BDRate fluctuations on the
video as more features are added.
Reducing this threshold to 0.9dB will help eliminating some of the
noise. No stats or speed change is observed on lowres, midres, hdres,
and screen-content set, but there stats_changed is possible.
BUG=aomedia:2600
STATS_CHANGED
Change-Id: I495c6602a2bd5b75104eb4ee7cc388acd0dcdfa2
diff --git a/av1/encoder/encoder.c b/av1/encoder/encoder.c
index c58215e..04e2bb3 100644
--- a/av1/encoder/encoder.c
+++ b/av1/encoder/encoder.c
@@ -5135,7 +5135,7 @@
}
#if !CONFIG_REALTIME_ONLY
-#define STRICT_PSNR_DIFF_THRESH 1.0
+#define STRICT_PSNR_DIFF_THRESH 0.9
// Encode key frame with/without screen content tools to determine whether
// screen content tools should be enabled for this key frame group or not.
// The first encoding is without screen content tools.
