[x265] [ANN] New Release v4.0

[Karam Singh]

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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