File svt-av1-psy.changes of Package svt-av1-psy

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File svt-av1-psy.changes of Package svt-av1-psy (Revision 08418e3435f73581f71df0a55c1e522b)

Currently displaying revision 08418e3435f73581f71df0a55c1e522b , Show latest

Fri Nov 15 06:49:12 UTC 2024 - solomocyj <solomoncyj@gmail.com>

- Features

* New parameter --kf-tf-strength for controlling alternate reference frame temporal filtering on keyframes. This should enable users to more finely control temporal filtering, specifically in scenarios where the benefits of lower --tf-strength are desired without the accompanying bitrate increase. The default value for this new parameter is 1.

- Quality & Performance

* Tune 4 now considers user-selected min & max QM values
    * Tune 4's chroma boost curve has been modified to be more compression efficient
    * The deblocking loop filter has been disabled at medium-high to high fidelity when using Tune 4

- Documentation

* Removed deprecated no-dec build option from build.sh example command list

- Bug Fixes

* Reverted optimized 32 and wider AVX2 block subtract due to a suspect memory issue causing crashing according to some users
    * Corrected noise normalization strength not being printed correctly when set to 0 with Tune 3
    * Fixed user-specified disablement of temporal filtering being ignored

- 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
    * 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%
    * 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

- Cleanup Build & Bug Fixes & 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

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File svt-av1-psy.changes of Package svt-av1-psy (Revision 08418e3435f73581f71df0a55c1e522b)

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