# Changelog ## [1.4.1] - 2022-12-12 Bugfixes: - Fix CRF with maxrate bug causing bitrate to be significantly limited for CRF encodings - Fix command line parsing forcing 1-pass in a 2-pass encoding mode when the --keyint=`x`s format is used - Fix decoder segfault due to assuming aligned buffers in the inverse transform assembly ## [1.4.0] - 2022-11-30 Encoder - Adopted the 6L / 32-picture mini-GOP configuraion as default and adjusted MD feature levels accordingly yielding higher compression efficiency gains - Update the TPL model to account for the larger mini-gop size - Re-tune presets M0-M12 using the gained coding efficiency for improved quality vs cycles tradeoffs - Allow duplicate commandline parameters to be parsed and take into consideration the latter to allow AWCY integration Build, Cleanup and Documentation - Make include and lib paths friendly to abs and rel paths - Update preset and API documentation - Various functional bug fixes - Remove manual prediction structure support ## [1.3.0] - 2022-10-18 Encoder - Port SIMD optimizations from libDav1D making the conformant path (Inv. Transform) faster - Enabling smaller mini-GOP size configurations and tuning it for the low delay mode - Tuning the low-latency mode in random access targeting latencies from 250ms to 1s - Adding GOP-constrained Rate Control targeting low-latency streaming applications - Optimize mode decision features levels for depth partitioning, RDOQ, MD stage0 pruning in-loop filtering temporal filtering and TPL adding more granularity and gaining further quality - Preset tuning M0-M13 to smooth the spacing and utilize the quality improvements towards better tradeoffs Build, Cleanup and Documentation - Update preset and API documentation - Various functional bug fixes - Remove the use of GLOB in cmake and use file names ## [1.2.1] - 2022-08-15 - Fix a crash at the end of the encode that may occur when an invalid metadata packet is sent with the EOS packet Build, Cleanup - y4m header pasring code cleanup - API cleanup and enhancements adding string options for RC mode - Added option to build without app / dec / enc using the build.sh / build.bat scripts ## [1.2.0] - 2022-08-02 Encoder - Improve CRF preset tradeoffs for both the default and fast-decode modes - Improve the SSIM-based tradeoffs of the presets without impacting those of PSNR / VMAF - Improve CBR mode by enhancing the bit-distribution within the gop - Added support for reference frame scaling - Added support for quantization matrices - Added svtparams patches applicable to ffmpeg 4.4 - AVX2 optimizations for low-delay mode - TPL-based VBR mode improvements - Improved Chroma RDOQ - Improve TPL QP Scaling - Add length info to ivf header - Fix support for metadata pass-through - Add ability to specify Chroma and Luma qindex offsets independently on top of CRF qp assignments Build, Cleanup and Documentation - Fix multiple API documentation mismatches - Updated features documentation - Various functional bug fixes ## [1.1.0] - 2022-05-17 Encoder - TPL tradeoff optimizations for 4L pred structure - Quality-vs-cycles tradeoff improvements across all presets - Add ability to force key_frame positions through ffmpeg for CRF mode - Minimize the quality impact of fast-decode while maintaining the decoder speedup - AVX2 optimizations for low delay mode - Fix VQ issues #1896 #1857 and #1819 Build, Cleanup and Documentation - API / ABI cleanup and implement independent versioning - Add UEB_DLL for static linking with pkgconf - Update system requirements docs - Rate control code refactoring - Fix AVX512 vs AVX2 mismatch ## [1.0.0] - 2022-04-22 Encoder - Added S-frames support - CBR Rate control mode for low delay - Added support for chroma position signalling - Added support for skipping denoising pictures after film grain synthesis - Extend fast-decode support to cover presets M0-M10 - Simplified --fast-decode to have only one level - Optimized --fast-decode level 1 for better tradeoffs - Visual quality improvements addressing issues #1819 / #1297 - Visual quality fixes and improvements for both tune 0 and 1 - Quality vs density tradeoffs tuning across all presets in CRF mode with TPL improvements - Update default settings to use a longer gop / higher quality preset and lower CRF value - Various code cleanups and memory optimizations - Additional AVX2 optimizations - Fixed all known functional bugs - More robust rate control parameter verification Build and Documentation - Major documentation update and re-structure - Added more user guides, preset guides and common questions section - Improve CI coverage - Reduced unnecessary warnings - Improved the documentation of the configuration parameters - Improve Unit Test Coverage - Address C vs asm mismatches ## [0.9.1] - 2022-02-23 Encoder - New `key=val` API for setting encoder options along with `--svtav1-params` appside - New `--fast-decode` option for producing bitstreams tuned for faster decoding M5- M10 - New `--tune` support for a subjectively optimized encoding mode - Quality vs density tradeoffs improvements for 4k resolutions and reduction or resolution checks - New SSE kernels for better encoding speed on older hardware - Bugfix: Removed `DISABLE_REALTIME` and instead implemented better checks for realtime encoding - All open library bugs resolved and closed Build and Testing - Windows: Moved .dll files to the binary directory next to the exe to fix dll loading issues - Windows: General VS 2017 compilation speedup - Windows: Added VS 2022 - BSD: Fixed compilation issues and errors surounding GLIBC specific interfaces and conflicting names - Dockerfile added ## [0.9] - 2022-01-19 Encoder - New faster presets M9-M12, M12 reaching similar complexity level to that of x264 veryfast - New multi-pass and single pass VBR implementation minimizing the quality difference vs CRF while reducing the cycle overhead - Quality vs density tradeoffs improvements across all presets in CRF mode - Added support for CRF with capped bitrate - Added support for overlay frames and super resolution - Fixed film grain synthesis bugs - Added experimental support for > 4k resolutions - Added experimental support for the low delay prediction structure - Significant memory reduction especially for faster presets in a multi-threaded environment - API configuration structure cleanup removing all invalid or out of date parameters - Speedup legacy CPUs for faster development by adding SSE code for corresponding C-kernels - Updated the code license from BSD 2-clause to BSD 3-clause clear - Cleaned up the code for various kernels - Updated the user guide and feature documentation Build and Testing - Bug fixes - Improve CI coverage - Improve Unit Test Coverage - Address C vs asm mismatches - Fix static analysis warnings / errors ## [0.8.7] - 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 as x265 medium tuned for VOD operating mode - 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 - 2-pass encoding is only available for VBR mode and 1-pass with lookahead is used for CRF - Improvements for TPL algorithm to handle long clips and easy content - 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 and left the config params that are linked to ffmpeg / gst - Update documentation accordingly - Added HDR support and color primaries signalling (off by default until integrated with ffmpeg) 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 linked 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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