Good day to you all folks.

We have another update to svt-av1-psy which has been cooking for a while now, and it’s rather large for a letter change. You already know the way we roll from previous releases; I’ll directly start with the changelog.

-> MAIN CHANGES:

• New parameter: --max-32-tx-size. This restricts block transform sizes to a maximum of 32x32 pixels. This can be useful in very specific scenarios for improving overall visual quality where the AV1 spec can allow for bad decisions decided by SAD/SSD/PSNR.

• New option: --hdr10plus-json. This parameter, added by quietvoid, allows for HDR10+ HDR support. In order to build a binary with support for HDR10+, see our PSY Development page

• New option: --adaptive-film-grain. This parameter which helps remedy perceptually harmful grain patterns caused by extracting grain from blocks that are too large for a given video resolution. This parameter is enabled by default.

-> TUNING:

• Disabled SSIM-cost transform decisions while keeping SSIM-cost mode decisions, generally improving Tune 3’s efficiency & consistency. Future changes might contain additional tuning at this level.

-> PERFORMANCE:

• Additional NEON optimizations for ARM platforms, providing a speed increase

-> BUG FIXES:

• Temporarily disabled quantization matrices (–enable qm 0) for presets 5 and higher due to a visual consistency bug: https://github.com/gianni-rosato/svt-av1-psy/issues/56