x265 2.3版本更新

Date: Wed, 15 Feb 2017 12:34:40 +0530

x265 version 2.3 has been released. This release contains new algorithms
that improveto visual quality, encoding efficiency, and performance.

The latest version can be downloaded from here
https://bitbucket.org/multicoreware/x265/downloads/x265_2.3.tar.gz (MD5
sum = 18716a7e0c6f6ebd2a1035b82cec30de). Full documentation is available at
http://x265.readthedocs.io/en/stable/.

Release Notes for 2.3

Encoder enhancements

1. New SSIM-based RD-cost computation for improved visual quality, and
   efficiency; use –ssim-rd to exercise.
2. Multi-pass encoding can now share analysis information from prior passes
   (in addition to rate-control information) to improve performance and
   quality of subsequent passes; to your multi-pass command-lines that use the
   –pass option, add –multi-pass-opt-distortion to share distortion
   information, and –multi-pass-opt-analysis to share other analysis
   information.
3. A dedicated thread pool for lookahead can now be specified with
   –lookahead-threads.
4. –dynamic-rd dynamically increase analysis in areas where the bitrate is
   being capped by VBV; works for both CRF and ABR encodes with VBV settings.
5. The number of bits used to signal the delta-QP can be optimized with the
   –opt-cu-delta-qp option; found to be useful in some scenarios for lower
   bitrate targets.
6. Experimental feature option:–aq-motion adds new QP offsets based on
   relative motion of a block with respect to the movement of the frame.

API changes

1. Reconfigure API now supports signalling new scaling lists.
2. x265 application’s csv functionality now reports time (in milliseconds)
   taken to encode each frame.
3. –strict-cbr enables stricter bitrate adherence by adding filler bits
   when achieved bitrate is lower than the target; earlier, it was only
   reacting when the achieved rate was higher.
4. –hdr can be used to ensure that max-cll and max-fall values are always
   signaled (even if 0,0).

Bug fixes

1. Fixed incorrect HW thread counting on MacOS platform.
2. Fixed scaling lists support for 4:4:4 videos.
3. Inconsistent output fix for –opt-qp-pss by removing last slice’s QP
   from cost calculation.
4. VTune profiling (enabled using ENABLE_VTUNE CMake option) now also works
   with 2017 VTune builds.

Happy compressing!
Pradeep.
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