Log Message:
x265: updated to 2.6

Version 2.6
===========

New features
------------
1. x265 can now refine analysis from a previous HEVC encode (using options \ 
:option:`--refine-inter`, and :option:`--refine-intra`), or a previous AVC \ 
encode (using option :option:`--refine-mv-type`). The previous encode's \ 
information can be packaged using the *x265_analysis_data_t*  data field \ 
available in the *x265_picture* object.
2. Basic support for segmented (or chunked) encoding added with \ 
:option:`--vbv-end` that can specify the status of CPB at the end of a segment. \ 
String this together with :option:`--vbv-init` to encode a title as chunks while \ 
maintaining VBV compliance!
3. :option:`--force-flush` can be used to trigger a premature flush of the \ 
encoder. This option is beneficial when input is known to be bursty, and may be \ 
at a rate slower than the encoder.
4. Experimental feature :option:`--lowpass-dct` that uses truncated DCT for \ 
transformation.

Encoder enhancements
--------------------
1. Slice-parallel mode gets a significant boost in performance, particularly in \ 
low-latency mode.
2. x265 now officially supported on VS2017.
3. x265 now supports all depths from mono0 to mono16 for Y4M format.

API changes
-----------
1. Options that modified PPS dynamically (:option:`--opt-qp-pps` and \ 
:option:`--opt-ref-list-length-pps`) are now disabled by default to enable users \ 
to save bits by not sending headers. If these options are enabled, headers have \ 
to be repeated for every GOP.
2. Rate-control and analysis parameters can dynamically be reconfigured \ 
simultaneously via the *x265_encoder_reconfig* API.
3. New API functions to extract intermediate information such as slice-type, \ 
scenecut information, reference frames, etc. are now available. This information \ 
may be beneficial to integrating applications that are attempting to perform \ 
content-adaptive encoding. Refer to documentation on \ 
*x265_get_slicetype_poc_and_scenecut*, and *x265_get_ref_frame_list* for more \ 
details and suggested usage.
4. A new API to pass supplemental CTU information to x265 to influence analysis \ 
decisions has been added. Refer to documentation on *x265_encoder_ctu_info* for \ 
more details.

Bug fixes
---------
1. Bug fixes when :option:`--slices` is used with VBV settings.
2. Minor memory leak fixed for HDR10+ builds, and default x265 when pools option \ 
is specified.
3. HDR10+ bug fix to remove dependence on poc counter to select meta-data \ 
information.