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Complete Version history / Release notes / Changelog for SVT-AV1


[0.8.7] - 2021-05-08
Encoder

Feature optimizations: creating new mode decision / encode-decode feature levels allowing better speed / quality trade-off granularity
Preset repositioning after adopting new levels
Preset 8 achieving similar speed levels to that of x265 medium in the VOD (shot-based encoding) use-case while maintaining quality gains
New 1-pass and 2-pass VBR implementation ported from libaom and adapted to the SVT architecture - still a WIP
Cleaned up old VBR and CVBR RC code along with the lookahead mechanism associated with them
Improvements for TPL algorithm to handle long clips and easy content
Added HDR support and color primaries SEI signaling (off by default until integrated with ffmpeg)
Memory optimizations, cleaning up data structures to reduce memory usage up to 2x memory reduction in multi-threaded VBR environment
Additional AVX2 and AVX512 optimizations
Cleaned up unused command line parameters except the config params that are linked to ffmpeg
Update user guide and documentation

Build and Testing

Bug fixes
Improve CI coverage
Improve Unit Test Coverage
Address C vs asm mismatches
Fix static analysis warnings / errors


[0.8.6] - 2020-11-28
Encoder
Further quality-speed tradeoffs tuning for VOD use cases
Improved TPL support within 1-pass and 2-pass CRF moode
Continued non-optimized support for 2pass VBR and CRF
Align kernel nomenclature to prefix svt_aom for kernels brough from libaom to avoid symbol conflicts
Build and Testing
Bug fixes
Improve CI
Added CI support for gitlab
Improve Unit Test Coverage
Address C vs asm mismatches
Fix static analysis warnings / errors
Add address sanitizer
Fix symbol conflicts with libaom and libvpx when staticly linked to ffmpeg


[0.8.5] - 2020-09-04
Relicensing notice
Change the outbound license from BSD+Patent to the AOM license / patent
Encoder
Added tpl support to adaptively change lambda and quantization parameters within the frame
Added multi staged hme support
Quality speed trade-offs tuned to VOD use cases
Added first level non-optimized support for 2pass VBR and CRF
Added combined cli two pass support with options for stats being written to a memory buffer and a specified file
Added non square partitioning optimizations
Improved lambda generation
Build and Testing
Bug fixes
Improve CI
Improve Unit Test Coverage
Address C vs asm mismatches
Fix static analysis warnings / errors
Add address sanitizer
Fix symbol conflicts with libaom and libvpx when staticly lined to ffmpeg


[0.8.4] - 2020-06-26
Build and Testing

Bug fixes
Improve CI
Improve Unit Test Coverage
Address C vs asm mismatches
Fix static analysis warnings / errors
Add address sanitizer
Various ffmpeg patch fixes
[0.8.3] - 2020-04-24
Encoder

Presets optimization
Build and Testing

Bug fixes
Xcode build support


[0.8.2] - 2020-04-18
Encoder

Initial Super resolution support
Mode decision rate estimation enhancements
Altref improvements
Manual prediction structure support
Enhanced RDOQ support
Improved warp motion
Improved documentation and help menu
New command line parameters
Fix non-multiple of 8 resolution video corruption for 8bit
Improved multi-stage mode decision support
Added multi-stage motion estimation support
Chroma mode decision optimizations
Added 16bit pipeline support
Added Mode decision non-square partition weights
Enhanced qp-scaling assignment
Memory optimizations
Added AVX512 Optimizations
Added AVX2 Optimizations
Decoder

Improved multi-threading support
Memory optimizations
Updated documentation
Loop filter flow optimization
Encoder and Decoder

Encoder-Decoder-Common folder structure improvements
Build and Testing

Bug fixes
Improve CI
Improve Unit Test Coverage
Address C vs asm mismatches
Support C only builds (for platforms other than x86)


[0.8.1] - 2020-01-28
Encoder

Palette support for 10-bit
Added the first batch of detailed documentation to help developers
Encoder and Decoder

Code cleanup and refactoring
Build and Testing

Bug fixes
Improve CI
Improve Unit Test Coverage
Address C vs asm mismatches


[0.8.0] - 2019-12-20
Encoder

Preset Optimizations
Single-core execution memory optimization [-lp 1 -lad 0]
Rate estimation update enhancements
Added on / off flags for feature run-time switching
Added auto-max partitioning algorithm
Multi-pass partitioning depth support
Remove deprecated RC mode 1 and shifter RC mode 2 and mode 3 to mode 1 and mode 2 respectively
Update Cost Calculation for CDEF Filtering
Intra-Inter Compound for 10-bit
Eigth-pel optimization
Added AVX512 Optimizations
Added AVX2 Optimizations
Decoder

Initial multi-threading support
Decoder optimizations / cleanup
Build and Testing

Bug fixes
Improve CI
Improve Unit Test Coverage
Address C vs asm mismatches


[0.7.5] - 2019-11-24
Encoder

RDOQ for 10-bit
Inter Intra Class pruning at MD-Staging
Global Motion Vector support for 8-bit and 10-bit
Interpolation Filter Search support for 10-bit
Palette Prediction support
2-pass encoding support
ATB 10-bit support at the encode pass
Simplified MD Staging [only 3 stages]
Inter-Inter and Inter-Intra Compound for 10-bit
Intra Paeth for 10-bit
Filter Intra Prediction
New-Near and Near-New support
OBMC Support for 8-bit and 10-bit
RDOQ Chroma
ATB Support for Inter Blocks
Temporal Filtering for 10-bit
Eight-pel support in predictive ME
MCTS Tiles support
Added AVX512 Optimizations
Added AVX2 Optimizations
Decoder

SuperRes support
Reference Frame Scaling support
12-bit support
Annex B support
Build and Testing

Bug fixes
Improve CI
Improve Unit Test Coverage
Address C vs asm mismatches


[0.7.0] - 2019-09-26
Encoder

Enhanced MRP Reference Frames
Intra Inter Compound
QP Modulation support
MFMV Support
MD Staging design [Up to 4 MD stages and 3 prediction classes: Intra / Inter / Compound]
Compound Motion prediction
10-bit Mode Decision support for Intra
Thread safe resource allocation
Added AVX512 Optimizations
Added AVX2 Optimizations
Decoder

Screen Content Tools
Temporal MV scan support
Inter support
Screen Content Tools support
Post Processing Filters support
Compound Mode (InterInter & InterIntra) Tool support
Decoder Film Grain support
Build and Testing

Improve CI
Improve build scripts
Improve cmake lists
Improve Unit Test Coverage
API update
Bug fixes


[0.6.0] - 2019-06-28
Inital decoder implementation
Static library support
Alt-ref pictures - temporal filtering
Adaptive Transform Block for INTRA
Adaptive QP scaling
Decoder - Support for Tiles and 10bit
API - add option to calculate / report PSNR values
Support for segmentation
SIMD Optimizations
Downsampling 2x2 filtering
Handle incomplete SBs
MACROS / trailing / tabs-spaces cleanup


[0.5.0] - 2019-05-17
8 bit / 10 bit 4:2:0 up to 4k60p resolutions
Presets 0-8
New API, FFmpeg, GStreamer plugins
Rate control support (VBR, CVBR)
Block sizes from 4x4 to 128x128
Non-square blocks
Tiles
Deblocking / CDEF / Restoration filters
Film Grain
Warped motion estimation
Intra block copy
Trellis quantized coefficient optimization
Support for 4 and 5 layers prediction structures
Chroma search in MD
Multi-reference picture support




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