x265 2.4版本更新

Date: Sat, 22 Apr 2017 17:33:54 -0700
x265 version 2.4 has been released. This release incorporates support for
the new HDR10+ standard, and revised lambda tables for main, main10, and
main12 profiles that significantly improve visual quality!

Version 2.4 can now be downloaded from here
https://bitbucket.org/multicoreware/x265/downloads/x265_2.4.tar.gz(md5:
ab0986aa5c4465b874de94095b0d0cae). Full documentation is available at
http://x265.readthedocs.io/en/stable/.

Release Notes for Version 2.4

Release date - 22nd April, 2017.

Encoder enhancements

1. HDR10+ supported. Dynamic metadata may be either supplied as a bitstream
   via the userSEI field of x265_picture, or as a json file that can be parsed
   by x265 and inserted into the bitstream; use –dhdr10-info to specify json
   file name, and –dhdr10-opt to enable optimization of inserting tone-map
   information only at IDR frames, or when the tone map information changes.
2. Lambda tables for 8, 10, and 12-bit encoding revised, resulting in
   significant enhancement to subjective visual quality.
3. Enhanced HDR10 encoding with HDR-specific QP optimizations for chroma,
   and luma planes of WCG content enabled; use –hdr-opt to activate.
4. Ability to accept analysis information from other previous encodes (that
   may or may not be x265), and selectively reuse and refine analysis for
   encoding subsequent passes enabled with the –refine-level option.
5. Slow and veryslow presets receive a 20% speed boost at iso-quality by
   enabling the –limit-tu option.
6. The bitrate target for x265 can now be dynamically reconfigured via the
   reconfigure API.
7. Performance optimized SAO algorithm introduced via the –limit-sao
   option; seeing 10% speed benefits at faster presets.

API changes

1. x265_reconfigure API now also accepts rate-control parameters for
   dynamic reconfiguration.
2. Several additions to data fields in x265_analysis to support
   –refine-level: see x265.h for more details.

Bug fixes

1. Avoid negative offsets in x265 lambda2 table with SAO enabled.
2. Fix mingw32 build error.
3. Seek now enabled for pipe input, in addition to file-based input
4. Fix issue of statically linking core-utils not working in linux.
5. Fix visual artifacts with –multi-pass-opt-distortion with VBV.
6. Fix bufferFill stats reported in csv.