[x265] [ANN] New Release v4.1

[Mahesh Pittala]

The v4.1 release of x265 is out now. Below is the list of new features,
optimization, and bug fixes in this version.

Version 4.1
===========

Release date - 22nd November, 2024.

New feature
-----------
1. Aom Film-Grain characteristics as a SEI message to support Film Grain
Synthesis.

API changes
-----------
1. API Support to enable VBV end feature.
2. Reverted the 4.0 api changes.
3. Added command line parameters for Aom film grain characteristics as a
SEI message to the bitstream (--aom-film-grain).
4. Added support to configure Bitrate, CRF, and QP at frame level, along
with CLI support for frame-level RC configuration (--frame-rc)
5. Declared few params(numapools, csvfn, scalingLists etc) with fixed size
to fix memory leaks

Optimizations
-------------
1. Eliminated redundant pointer copies in lowresMC and lowresQPelCost,
improving encoding performance by up to 0.9% on modern CPUs.
2. Mcstf optimization - Improved mcstf performance by moving mcstf
computation to lookahead and search range optimization.

Bug fixes
---------
1. mcstf crash when using multiple frame threads.
2. CLI parsing for MV-HEVC Encode.
3. segfault and decoder crash in scc.
4. compilation issue in clang.
5. potential stack buffer overflow issues.
6. documentation for b-intra, max-merge, limit-refs and qg-size
7. memory leak fixes for sei, zones, sao, hme, vbv, sbrc, mcstf, alpha,
multiview, scc, two pass, rskip, film grain, aq-mode, scaling_list, fades,
analysis save and load etc

Known issues
------------
1. Inconsistent output with recon option
2. Output mismatch between analysis save & load with cutree for
reuse-levels < 10

Thanks,
Mahesh
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