[x265] [ANN] New Release v4.0

[Andrey Semashev]

This release crashes in libheif tests:

https://bitbucket.org/multicoreware/x265_git/issues/952/crash-in-libheif-tests

On 9/13/24 16:43, Karam Singh wrote:
> The v4.0 release of x265 is out now. Below is the list of new features,
> optimization, and bug fixes in this version.
> 
> 
> Version 4.0
> ===========
> 
> New feature
> -----------
> 1. Alpha Channel feature.
> 2. Screen Content Coding (SCC).
> 3. MV-HEVC feature.
> 
> Enhancements to existing features
> ---------------------------------
> 1. Added support for the VMAF v3.x.
> 
> API changes
> -----------
> 1. Add command line parameter for Alpha Channel feature :option:`--alpha`.
> 2. Add command line parameter for SCC feature :option:`--scc 1`.
> 3. Add command line parameters for the MV-HEVC feature
> :option:`--multiview-config "multiview_config.txt"`.
> 
> Optimizations
> ---------------------
> 1. Arm SIMD optimizations: Several time-consuming scalar C functions now
> have SIMD implementations on Arm platforms. Existing Arm SIMD
> implementations have also been optimized. These optimizations result in
> up to 57% faster encoding compared to release 3.6.
> 2. Arm SIMD optimizations include use of Armv8.4 DotProd, Armv8.6 I8MM,
> and Armv9 SVE2 instruction set extensions. The following algorithms now
> have optimized SIMD implementations: SAD, SSE, DCT, SAO, convolution,
> quantization, intra_planar, intraFilter, intrapred DC and IDCT16x16.
> 
> Bug fixes
> ---------
> 1. Fix for y4m pipe input broken.
> 2. Fix SCC crash on multipass encode.
> 3. Fix mcstf when :option:`--bframes` value was less than 5.
> 4. Fix lowpass DCT for high bit depth.
> 5. Added build support for Visual Studio 17.
> 6. Fix issue in default code flow and memory leak.
> 7. Framethreads tuning for Windows ARM devices.
> 8. Fix scc crash on multipass encode.
> 
> Thanks & Regrds,
> 
> Karam Singh
> 
> *__________________________*
> *Karam Singh*
> *Ph.D. IIT Guwahati*
> Senior Software (Video Coding) Engineer  
> Mobile: +91 8011279030
> Block 9A, 6th floor, DLF Cyber City
> Manapakkam, Chennai 600 089
> 
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