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CHANGELOG.md

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Changelog

[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

[2.2.0] - 2024-08-19

API updates

  • No API changes on this release

Encoder

  • Improve the tradeoffs for the random access mode across presets:
  • Speedup of ~15% across presets M0 - M8 while maintaining similar quality levels (!2253)
  • Improve the tradeoffs for the low-delay mode across presets (!2260)
  • Increased temporal resolution setting to 6L for 4k resolutions by default
  • Added Arm optimizations for functions with c_only equivalent yielding an average speedup of ~13% for 4k10bit

Cleanup Build and bug fixes and documentation

  • Profile-guided-optimized helper build overhaul
  • Major cleanup and fixing of Neon unit test suite
  • Address stylecheck dependence on public repositories

[2.1.2] - 2024-06-27

Cleanup, bug fixes:

  • Fixed profile-guided-optimization build by removing the remaining decoder path

[2.1.1] - 2024-06-25

Cleanup, bug fixes, and documentation improvements:

  • Removed the SVT-AV1 Decoder portion of the project. The last version containing the decoder is SVT-AV1 v2.1.0.
  • Updated the folder structure and library build order to reflect the removal of the decoder.
  • Renamed all files (except for API files) to remove the "Eb" prefix and changed them to camel_case format.
  • Updated the gtest version to v1.12.1.
  • Added CI support for Arm-based macOS machines.
  • Improved documentation for accuracy and completeness.

[2.1.0] - 2024-05-17

API updates

  • One config parameter added within the padding size. Config param structure size remains unchanged
  • Presets 6 and 12 are now pointing to presets 7 and 13 respectively due to the lack of spacing between the presets
  • Further preset shuffling is being discussed in #2152

Encoder

  • Added variance boost support to improve visual quality for the tune vq mode
  • Improve the tradeoffs for the random access mode across presets:
  • Speedup of 12-40% presets M0, M3, M5 and M6 while maintaining similar quality levels
  • Improved the compression efficiency of presets M11-M13 by 1-2% (!2213)
  • Added Arm optimizations for functions with c_only equivalent

Cleanup Build and bug fixes and documentation

  • Use nasm as a default assembler and yasm as a fallback
  • Fix performance regression for systems with multiple processor groups
  • Enable building SvtAv1ApiTests and SvtAv1E2ETests for arm
  • Added variance boost documentation
  • Added a mailmap file to map duplicate git generated emails to the appropriate author

[2.0.0] - 2024-03-13

Major API updates

  • Changed the API signaling the End Of Stream (EOS) with the last frame vs with an empty frame
  • OPT_LD_LATENCY2 making the change above is kept in the code to help devs with integration
  • Removed the 3-pass VBR mode which changed the calling mechanism of multi-pass VBR
  • Moved to a new versioning scheme where the project major version will be updated everytime API/ABI is changed

Encoder

  • Improve the tradeoffs for the random access mode across presets:
  • Speedup presets MR by ~100% and improved quality along with tradeoff improvements across the higher quality presets (!2179)
  • Improved the compression efficiency of presets M9-M13 by 1-4% (!2179)
  • Simplified VBR multi-pass to use 2 passes to allow integration with ffmpeg
  • Continued adding Arm optimizations for functions with c_only equivalent
  • Replaced the 3-pass VBR with a 2-pass VBR to ease the multi-pass integration with ffmpeg
  • Memory savings of 20-35% for LP 8 mode in preset M6 and below and 1-5% in other modes / presets

Cleanup and bug fixes and documentation

  • Various cleanups and functional bug fixes
  • Update the documentation to reflect the rate control changes

[1.8.0] - 2023-12-11

Encoder

  • Improve the tradeoffs for the random access mode across presets:
  • Speedup CRF presets M6 to M0 by 17-53% while maintaining similar quality levels
  • Re-adjust CRF presets M7 to M13 for better quality with BD-rate gains ranging from 1-4%
  • Improve the quality and speed of the 1-pass VBR mode
  • More details on the per preset improvements can be found in MR !2143
  • Add API allowing to update bitrate / CRF and Key_frame placement during the encoding session for CBR lowdelay mode and CRF Random Access mode
  • Arm Neon SIMD optimizations for most critical kernels allowing for a 4.5-8x fps speedup vs the c implementation

Cleanup and bug fixes and documentation

  • Various cleanups and functional bug fixes
  • Update the documentation for preset options and individual features

[1.7.0] - 2023-08-23

Encoder

  • Improve the tradeoffs for the random access mode across presets MR-M13:
  • Quality improvements across all presets and metrics ranging from 0.3% to 4.5% in BD-rate (!2129)
  • Spacing between presets [M1-M6] has been adjusted to account for the tradeoff improvements achieved
  • As a user guidance when comparing v1.7 vs v1.6 in a convexhull encoding setup:
  • v1.7.0 M2 is now at similar quality levels as v1.6.0 M1 while being ~50% faster
  • v1.7.0 M3 is now at similar quality levels as v1.6.0 M2 while being ~50% faster
  • v1.7.0 M4 is now at similar quality levels as v1.6.0 M3 while being ~40% faster
  • v1.7.0 M5 is now at similar quality levels as v1.6.0 M4 while being ~30% faster
  • v1.7.0 M6 is now at similar quality levels as v1.6.0 M5 while being ~25% faster
  • Added an experimental tune SSIM mode yielding ~3-4% additional SSIM BD-rate gains (!2109)

Build, cleanup and bug fixes

  • Various cleanups and functional bug fixes
  • Fix build conflict with libaom

[1.6.0] - 2023-06-18

Encoder

  • Improve the tradeoffs for the random access mode across presets M1-M13:
  • Speeding up the higher quality presets by 30-40%
  • Improving the BD-rate by 1-2% for the faster presets
  • Improve the tradeoffs for the low delay mode for both scrren content and non-screen content encoding modes
  • Add a toggle to remove the legacy one-frame buffer at the input of the pipeline alowing the low delay mode to operate at sub-frame processing latencies
  • Add a new API allowing the user to specify quantization offsets for a region of interest per frame

Build, cleanup and bug fixes

  • Various cleanups and functional bug fixes
  • Fix the startup minigop size BD-rate loss
  • Add ability to run the ci-testing offline

[1.5.0] - 2023-04-25

Encoder

  • Optimize the tradeoffs for M0-M13 speeding up M5-M1 by 15-30% and improving the BDR of M6-M13 by 1-3%
  • Create a new preset MR (--preset -1) to be the quality reference
  • Optimize the tradeoffs for M8-M13 in the low delay encoding mode (!2052 !2096 and !2102) for SC and non-SC modes
  • Add dynamic minigop support for the random access configuration enabled by default in M9 and below
  • Add support to allow users to specify lambda scaling factors through the commandline
  • Rewrite the gstreamer plugin and updating it to be uptodate with the latest API changes
  • Add skip frames feature allowing the user to start encoding after n frames in the file
  • Add ability to specify a smaller startup minigop size for every gop to enable faster prefetching
  • Fix segmentation support and re-enable it with --aq-mode 1 to allow work on the region of interest API
  • Add padding bytes to the EbSvtAv1EncConfiguration configuration structure keep its size unchanged until v2.0

Build, Cleanup and Documentation

  • Major cleanups for unused variables, static functions, and comments formatting
  • Reduce the size of variables
  • Refine app level parsing and reference scaling API calls in the application
  • Add dynamic minigop documentation along with updating the documentation accordingly

[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=xs 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