2016年9月22日，x265发布了2.1版本，此版本新增了对qg-size为8的支持，并实验性地支持slice-parallelism。此外，还增强了API以便支持用户定义的SEI消息，修复了一些bug，包括QP波动、32位平台上的崩溃问题及Windows平台上的线程池创建问题。
2016年9月22日
x265 version 2.1 has been released. This release contains experimental
support for slice-parallelism, enhancements to the API to support
user-defined SEI messages, and other bug fixes.
Full documentation is available at
http://x265.readthedocs.org/en/stable/
Release Notes for 2.1
================
Encoder enhancements
----------------------------------
1. Support for qg-size of 8
2. Experimental support for slice-parallelism.
API changes
-------------------
1. Encode user-define SEI messages passed in through x265_picture object.
2. Disable SEI and VUI messages from the bitstream
3. Specify qpmin and qpmax
4. Control number of bits to encode POC.
Bug fixes
--------------
1. QP fluctuation fix for first B-frame in mini-GOP for 2-pass encoding
with tune-grain.
2. Assembly fix for crashes in 32-bit from dct_sse4.
3. Threadpool creation fix in windows platform.
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