Analysis: libvpx ’s --cq-level parameter ignored luminance banding visibility. Rectification required manual tuning: --enable-tpl-model=1 --aq-mode=4 (variance-based AQ) to flatten the sky regions.
[Generated AI] Date: May 20, 2024
The monochromatic, high-dynamic-range scene (Giedi Prime’s black sun) exposed a flaw in libvpx ’s default psychovisual optimization. Due to the lack of chroma information (UV planes near-zero), the rate-distortion algorithm over-allocated bits to residual luma noise, causing in the sky. dune: part two libvpx