SVT-AV1 2.3 Brings More Performance Improvements: AVX-512 & LTO By Default, More Tuning

Written by Michael Larabel in Multimedia on 31 October 2024 at 06:20 AM EDT. 6 Comments
MULTIMEDIA
SVT-AV1 2.3 is now available as the newest feature release to this leading open-source AV1 encoder. With SVT-AV1 2.3 there are yet more performance improvements.

SVT-AV1 2.3 was released yesterday and while it's already the fastest AV1 encoder around, the new version brings yet more improvements for squeezing out additional performance for CPU-based AV1 coding. The prominent highlights include:
- 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%.
- 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

The benchmarks shown in this release announcement highlight the very significant performance uplift over the prior release:

SVT-AV1 2.3 performance uplift


SVT-AV1 2.3 can be downloaded via the project's GitLab. I'll be working on some new SVT-AV1 benchmarks shortly for different CPUs.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via MichaelLarabel.com.

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