commit 1ae7ce7b12d6758a05598278f3d9bc779fa17f4a
author Julio Barba <juliobbv@gmail.com> Wed Nov 26 13:59:03 2025 -0500
committer Julio Barba <juliobbv@gmail.com> Wed Nov 26 13:59:03 2025 -0500
tree 748b6763fab20c3f119b83c0dc0ed05b7e3b913e
parent 49622673afe98cf77876639d97f4523391120cea

Adaptive sharpness: tweak LPF threshold

Testing QP 30 with tune=iq revealed a lower loop filter sharpness
strength was slightly more beneficial perceptually.

This change also comes with a 0.02 point SSIMULACRA 2 improvement
(at no file size change).

Bug: aomedia:463698815
Change-Id: I15f4429795db44dc8d65c24cd3662f65f813afb4

av1/encoder/picklpf.c

diff --git a/av1/encoder/picklpf.c b/av1/encoder/picklpf.c
index 613613d..ecf4244 100644
--- a/av1/encoder/picklpf.c
+++ b/av1/encoder/picklpf.c
@@ -228,7 +228,7 @@
     // written to pick levels 0, 1 and 7 to keep it simple.
     int max_lf_sharpness;
 
-    if (cm->quant_params.base_qindex <= 120) {
+    if (cm->quant_params.base_qindex <= 112) {
       max_lf_sharpness = 7;
     } else if (cm->quant_params.base_qindex <= 160) {
       max_lf_sharpness = 1;