[x265] [ANN] x265 1.9 released

[Deepthi Nandakumar]

x265 version 1.9 has now been released. This release supports many new
features as well as additional assembly optimizations for Main12, intra
prediction and SAO. Recently added features lookahead-slices, limit-refs
and limit-modes have been enabled by default in the supported presets.

Full documentation is available at http://x265.readthedocs.org/en/stable/
<http://x265.readthedocs.org/en/1.7/>

========================================== New Features
==============================================

   - Quant offsets: This feature allows block level quantization offsets to
   be specified for every frame. An API-only feature.
   - --intra-refresh: Keyframes can be replaced by a moving column of intra
   blocks in non-keyframes.
   - --limit-modes: Intelligently restricts mode analysis.
   - --max-luma and --min-luma for luma clipping, optional for HDR use-cases
   - Emergency denoising is now enabled by default in very low bitrate, VBV
   encodes

=========================================== API Changes
==============================================

   - x265_frame_stats returns many additional fields: maxCLL, maxFALL,
   residual energy, scenecut  and latency logging
   - --qpfile now supports frametype 'K"
   - x265 now allows CRF ratecontrol in pass N (N greater than or equal to
   2)
   - Chroma subsampling format YUV 4:0:0 is now fully supported and tested

====================================== Presets and Performance
==========================================

   - Recently added features lookahead-slices, limit-modes, limit-refs have
   been enabled by default for applicable presets.
   - The default psy-rd strength has been increased to 2.0
   - Multi-socket machines now use a single pool of threads that can work
   cross-socket.


Thanks,
Deepthi Nandakumar
Engineering Manager, x265
Multicoreware, Inc
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