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## [2.3.0] - 2024-10-28 API updates - Preset shift: M12/M13 mapped to M11, M7-M11 shifted one position down. API does not change, all presets from MR-M13 will still be accepted - svt_av1_enc_get_packet API is now a blocking call for low-delay enforcing a picture in, picture out model - --fast-decode range changed from 0-1 to 0-2 available on all presets - Introducing a new definition of --lp being levels of parallelism with a new field in the config structure level_of_parallelism - logical_processors will be deprecated in the 3.0 release Encoder - NEW FAST DECODE MODE - (!2280) - New fast-decode (2) to allow for an average AV1 software cycle reduction of 25-50% vs fast-decode 0 with a 1-3% BD-Rate loss across the presets - Improved fast-decode (1) option to increase its AV1 software cycle reduction by ~10% while maintaining the same quality levels - Improved --lp settings for high resolutions, with CRF gaining a ~4% improvement in speed and VBR gaining ~15% (!2323) - Further Arm-based optimizations improving the efficiency of previously written Arm-neon implementations by an average of 30%. See below for more information on specific presets - Address speed regressions for high resolutions first pass encode by tuning the threading parameters, with 1080p showing the biggest gains - Enabled AVX512 by default in cmake allowing for ~2-4% speedup - Enabled LTO by default if using a new enough compiler (!2288, !2305) - If LTO is a problem or causes one, it can be disabled by adding -DSVT_AV1_LTO=OFF to cmake to force it off. - Please report any issues that occur when using it. Cleanup Build and bug fixes and documentation - third_party: update safestringlib with applicable upstream changes - Improved the unit test coverage for Arm-neon code - Updated documentation Arm Improvements - Speed comparison was done against v2.2 on AWS Graviton4 instances with Clang 19.1.1 - `--lp 1` was used for all tests Standard bitdepth (Bosphorus 1080p): | Preset | Uplift | |-------------------------------|--------| | 0 | 1.15x | | 1 | 1.24x | | 2 | 1.29x | | 3 | 1.17x | | 4 | 1.22x | | 5 | 1.31x | | 6 | 1.40x | | 7 (against 2.2 preset 8) | 1.50x | | 8 (against 2.2 preset 9) | 1.61x | | 9 (against 2.2 preset 10 | 1.31x | | 10 (against 2.2 preset 11 ) | 1.29x | | 11 (against 2.2 preset 12/13) | 1.24x | High bitdepth (Bosphorus 2160p): | Preset | Uplift | |-------------------------------|--------| | 0 | 1.18x | | 1 | 1.19x | | 2 | 1.16x | | 3 | 1.27x | | 4 | 1.33x | | 5 | 1.27x | | 6 | 1.33x | | 7 (against 2.2 preset 8) | 1.35x | | 8 (against 2.2 preset 9) | 1.82x | | 9 (against 2.2 preset 10) | 1.95x | | 10 (against 2.2 preset 11) | 1.40x | | 11 (against 2.2 preset 12/13) | 1.35x |
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