tree ac14c8a260686805f3c96ff086ae11f752f941f6
parent 36813a38590b5867158db5ab2ecaddffe30c5c8c
author Julio Barba <juliobbv@gmail.com> 1731823624 -0500
committer Cheng Chen <chengchen@google.com> 1732205820 +0000

Tweak rdmult with `tune=ssimulacra2`

Tweak rdmult derivation in two places:
1. When computing rdmult in many parts of the encoder:
   - `av1_compute_rd_mult()`
   - `av1_compute_rd_mult_based_on_qindex()`
2. While performing trellis quantization:
   - `av1_optimize_txb()`

These two tweaks work synergistically to improve subjective
quality and SSIMULACRA2 scores.

Approximate BD-Rate gains over no rdmult tweaks - cpu-used=6
(Daala's subset1):
- SSIMULACRA2 60: -1.2%
- SSIMULACRA2 70: -1.4%
- SSIMULACRA2 80: -1.2%
- SSIMULACRA2 90: -1.3%

Bug: aomedia:375221136
Change-Id: I559ee11f1924e6ea069e56b2accbfd00f41c24c7