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SVT-AV1 4.0 brings major performance improvements including 5-8x speedup for still image encoding with MS-SSIM tuning, 5-15% speedup in RTC modes, and 10-25% speedup for Random Access mode. The release adds AC Bias for better detail preservation, completes SVT-AV1-PSY feature porting for visual quality modes, updates S-Frame support, and includes Arm Neon and SVE2 optimizations that improve high bitdepth encoding by ~5%.

SVT-AV1 4.0 Released With More Performance Optimizations