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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