v2.2.0-rc1

Note: this is a release candidate, not an official release. Expect the lack of polish that usually accompanies pre-release software, as well as this potentially incomplete release changelog.

PSY Updates

Features

• --tf-strength parameter for manually adjusting temporal filtering strength. By default, reduces temporal filtering strength by 4x

Quality & Performance

• Enable 10-bit subpixel motion estimation processing for 10-bin inputs on Preset 3 & below
• Enable SUPERRES_AUTO_ALL for Tune 3 when superres-mode=4
  • Disables ALT-REF superres for speed and quality
• Add unipred bias for SSIM full mode decision cost when using Tune 3
• New perceptual QM curve when using Tune 3
  • Better chroma QM adjustment & better high fidelity performance

Documentation

• --help menu correctly prints maximum CRF value (70)
• Default Tune 2 is better reflected across documentation
• Updated build documentation

Bug Fixes

• Scoped down QM disablement to only affect NEON-enabled systems
• Scoped down global sharpness features to --sharpness 1, as was the original intention

Mainline Updates

API updates

• No API changes on this release

Encoder

• Improve the tradeoffs for the random access mode across presets:
  • Speedup of ~15% across presets M0 - M8 while maintaining similar quality levels
• Improve the tradeoffs for the low-delay mode across presets
• Increased temporal resolution setting to 6L for 4k resolutions by default
• Added ARM optimizations for functions with c_only equivalent yielding an average speedup of ~13% for 4k 10-bit

Cleanup Build & bug fixes & documentation

• Profile-guided-optimized helper build overhaul
• Major cleanup and fixing of Neon unit test suite
• Address stylecheck dependence on public repositories

Thanks for using SVT-AV1-PSY! ♥️

Full Changelog: https://github.com/gianni-rosato/svt-av1-psy/commits/v2.2.0-rc1