[x265] [ANN] x265 0.5 released

[Steve Borho]

Hello,

I have just tagged release 0.5 on our stable branch. x265 0.5 is a
regularly scheduled release.

= New Features =

* x265 can now be built by Mac OS X clang compiler
* install/uninstall build targets (install-only for Windows)
* Our cmake scripts now build static and shared libraries
* --ref N is now supported for enabling multiple L0 references
* SSIM global statistic reporting (--ssim)
* CSV logging is now a core feature, introduced per-frame logging

= API Changes =

* "_t" suffix removed from public data types for POSIX compatibility
* public API is now versioned
* --cpuid meaning has changed from level to capability bitmap, same as x264
* param.bipredSearchRange has been removed (--bpredrange N)
* param.maxNumReferences has been added    (--ref N)
* param.csvfn has been added               (--csv FILENAME.csv)
* PSNR and/or SSIM reporting are optional  (--[no-]psnr --[no-]ssim)
* x265_version_str exported string symbol with version (tag) info
* x265_build_info_str exported string symbol with compile info
* x265_encoder_get_stats() method for querying encoder statistics
* x265_encoder_log() method for writing to CSV log file
* x265_param_parse() method for configuring x265_param_t via strings

* x265 now requires cmake 2.8.8 or later in order to build
* Weightp options re-enabled, but feature is still unfinished
* param.rc.aqmode, param.rc.aqstrength for unfinished AQ support

= Improvements =

* x265 is deterministic at -F1 and separately deterministic for Fn>1
  (ie: -F2 and -F12 will give the same outputs if all other args are same)
* We have adopted a bidir search more closely resembling x264's bidir
* Lookahead analysis now includes bidir candidates for B slice types
* Lookahead uses thread pool and wave-front block scheduling
* The "multiple of min CU size (4)" resolution requirement has been removed
* More x264 assembly is being used for motion search and bidir MC
* PSNR and SSIM are measured row-by-row after deblocking and SAO
* Use of Standard Template Library classes has been removed
* SIMD Vector Classes are no longer used for 8bpp primitives

= Upcoming improvements =

* support in CLI for reading YUV or Y4M on stdin (already in default)
* performance presets
* Main10 profile
* Weightp in lookahead, weight analysis adapted from x264
* lookahead worker thread
* Adaptive QP

-- 
Steve Borho
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