Re: [BLFS Trac] #23502: SVT-AV1-4.2.0

#23502: SVT-AV1-4.2.0
-------------------------+-------------------------
 Reporter:  Bruce Dubbs  |       Owner:  Joe Locash
     Type:  enhancement  |      Status:  closed
 Priority:  normal       |   Milestone:  13.1
Component:  BOOK         |     Version:  git
 Severity:  medium       |  Resolution:  fixed
 Keywords:               |
-------------------------+-------------------------
Changes (by Joe Locash):

 * resolution:   => fixed
 * status:  assigned => closed

Comment:

 {{{
 ## [4.2.0] - 2026-07-14

 VOD / Random Access

 - Added TUNE-VMAF mode targeting ~15% VMAF BD-rate improvement at minimal
 PSNR l
 oss
 - Implemented single-thread processing mode with RA handling
 - RA preset tuning and bitrate optimization for M3-M5
 - New CLI options: `--cqp`, `--enable-intrabc`, `--hbd-mds`, `--enable-kf-
 tf`
 - Added raw OBU output format as an alternative to IVF
 - Signal `initial_display_delay` in sequence header to fix A/V sync on
 seek

 RTC / Low Delay

 - Added CBR rate control with Kalman-filter QP estimation, cyclic refresh,
 and f
 rame re-encode
 - Added on-the-fly MG size, preset, bitrate, and frame rate changes
 - Added reference frame management API with LTR support and two-layer RPS
 struct
 ure
 - Exposed `--max-intra-bitrate-pct` and `--max-inter-bitrate-pct`
 parameters
 - Improved compression efficiency vs. cycle tradeoff across RTC presets
 - Optimized memory footprint for RTC mode with small resolutions
 - Further speed and quality tuning for RTC

 Encoder (general)

 - Refactored entropy coding: direct tile-buffer writes, arithmetic coder
 simplifications, coefficient shaving
 - CDEF optimizations: 8-bit boundary-aware filter, persistent scratch
 buffers, luma/chroma specialization
 - MD and ME optimizations (LPD1 early-skip, VLPD0 fast path, static-block
 ME bypass)
 - Optimized still-image screen content detection
 - Optimized TPL dispatch when TPL is disabled
 - Added `ENABLE_STACK_PROTECTOR` CMake option to prevent the stack
 protector flag from being added

 Arm

 - Added lowbd (8-bit) int16 forward transform NEON kernels (4x4 through
 32x32)
 - Added Neon SAD, quantize-matrix, SSIM, VMAF, variance, and pixel
 projection error kernels
 - Added SVE2 VMAF kernels and hardware CRC-32C for hash-based ME
 - Optimized convolution, full distortion, and SAD calculation functions

 Bug fixes and documentation

 - Fixed superres recode crash, RESIZE_DYNAMIC under `--rtc`, RTC
 candidate-count overflow, recon output, and memory leak
 - Fixed signed left-shift UB, OOB reads, and race conditions in rate
 control
 - Added NVTX/Nsight Systems profiling hooks, PPC toolchain, and macOS
 universal binary support
 - Addressed cppcheck warnings and rewrote affected unit tests
 - Addressed USAN and MSAN warnings
 - Reduced OBMC stack usage to fix a crash with PGO
 - General code cleanup, documentation updates, and test improvements
 }}}
 Fixed at [sha:f31fec359f].
-- 
Ticket URL: <https://wiki.linuxfromscratch.org/blfs/ticket/23502#comment:4>
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