[3.1.0] - 2025-7-24
API updates
- Added new flags for --chroma-qm-min and --chroma-qm-max from SVT-AV1-PSY (!2442)
- Introducing --rtc flag to set the default parameters for an improved RTC performance (!2443)
- Enabled M11 and M12 presets for rtc mode for faster speed levels (!2452)
Encoder
- Improved mid and high quality presets quality vs speed tradeoffs for fast-decode 0,1,2 modes in random access (!2443):
- ~15-25% speedup for M1-M5 at the same quality levels for fast-decode 0
- ~15-20% speedup for M3-M7 at the same quality levels for fast-decode 1,2
- 1-1.5% BD-Rate improvement for M0 MR
- Significant improvements in Low Delay mode and enabling presets 0-6 by enabling missing coding features
- Improved performance of the RTC mode with ~5-10% BD-Rate improvements at similar complexity across presets M7-M10 (!2452)
- Further Arm Neon and SVE2 optimizations that improve high bitdepth encoding by an average of ~10% in low resolutions
- Added S-Frame support for random access mode (!2451)
- Additional improvements / porting of features from SVT-AV1-PSY for variance boost (!2431, !2432)
Cleanup Build and bug fixes and documentation
- General testing improvements and fixes (!2406, !2454)
- Deprecated unused avx512{er,pf} as they were never used and also removed with GCC 15 (!2415)
- Visual console display fixes (!2420, !2423)
- Fixed compilation bugs and cleanup with Arm (!2417, #2259, !2427, !2434, !2438, !2439)
- Fixed some formulas in the documentation (!2444)
- Added new options to slim down SVT-AV1 for RTC use cases (!2456, !2457, !2459)
- Fixed some issues with QP handling, vbr stability, and screen content (!2458, #2262, #2272, #2273)
- Fixes issue with resize-mode (!2463, #2282, #2260)
- Removed cpuinfo dependency and instead use cpu detection code from aom (!2426, !2453)
Arm Improvements
- Speed comparison was done against v3.0.2 on AWS Graviton4 instances with Clang 20
- Uplits are geometric means across presets 0-10
Landscape video:
- 1080p: +4%
- 720p: +6%
- 480p: +6%
- 360p: +3%
- 240p: +4%
Portrait video:
- 1080p: +8%
- 720p: +4%
- 480p: +3%
- 360p: +7%
- 240p: +4%