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x265 Encoder is a free software library and application for encoding video streams into the H265/MPEG-H HEVC compression format, and is released under the terms of the GNU GPL. x265 CLI is a command line software. x265 is used in several free video converters like Handbrake, Xvid4PSP, StaxRip, RipBot264, MEGUI, Xmedia Recode, etc. See All features how to install on Linux/Mac OSX.

Free software
OS:Windows Mac Linux
Version:2.5 / 2.5+69 Nightly
Released:Jul 13,2017
File size:1MB
7.3/10
10 votes

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x265 Encoder screenshot
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Latest version

2.5 / 2.5+69 Nightly (July 13, 2017)




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Download x265 Encoder 2.5  [1MB]  [Win]  [Portable]

Download x265 Encoder 2.5 64-bit  [ca 1MB]  [Win64]  [Portable]




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Download x265 Encoder 2.5+69 Nightly  [Win]

Download x265 Encoder 2.5+69 Nightly 64-bit  [Win64]

Download x265 Encoder 2.5 from another mirror site  [Win]

Download x265 Encoder 2.5 Mac  [Mac]

Download x265 Encoder 2.5 Linux  [Linux]




Supported operating systems

WinWindows MacMac OS LinuxLinux




License

Free software




More information and other downloads





Version history / Release notes / Changelog


Version 2.5
Release date - 13th July, 2017.

Encoder enhancements
Improved grain handling with --tune grain option by throttling VBV operations to limit QP jumps.
Frame threads are now decided based on number of threads specified in the --pools, as opposed to the number of hardware threads available. The mapping was also adjusted to improve quality of the encodes with minimal impact to performance.
CSV logging feature (enabled by --csv) is now part of the library; it was previously part of the x265 application. Applications that integrate libx265 can now extract frame level statistics for their encodes by exercising this option in the library.
Globals that track min and max CU sizes, number of slices, and other parameters have now been moved into instance-specific variables. Consequently, applications that invoke multiple instances of x265 library are no longer restricted to use the same settings for these parameter options across the multiple instances.
x265 can now generate a seprate library that exports the HDR10+ parsing API. Other libraries that wish to use this API may do so by linking against this library. Enable ENABLE_HDR10_PLUS in CMake options and build to generate this library.
SEA motion search receives a 10% performance boost from AVX2 optimization of its kernels.
The CSV log is now more elaborate with additional fields such as PU statistics, average-min-max luma and chroma values, etc. Refer to documentation of --csv for details of all fields.
x86inc.asm cleaned-up for improved instruction handling.
API changes
New API x265_encoder_ctu_info() introduced to specify suggested partition sizes for various CTUs in a frame. To be used in conjunction with --ctu-info to react to the specified partitions appropriately.
Rate-control statistics passed through the x265_picture object for an incoming frame are now used by the encoder.
Options to scale, reuse, and refine analysis for incoming analysis shared through the x265_analysis_data field in x265_picture for runs that use --analysis-reuse-mode load; use options --scale, --refine-mv, --refine-inter, and --refine-intra to explore.
VBV now has a deterministic mode. Use --const-vbv to exercise.
Bug fixes
Several fixes for HDR10+ parsing code including incompatibility with user-specific SEI, removal of warnings, linking issues in linux, etc.
SEI messages for HDR10 repeated every keyint when HDR options (--hdr-opt, --master-display) specified.

View full changelog




All features


Encoder features
Full prediction and transform quad-tree recursion supported
Adaptive B-frame placement
B-frames as references / arbitrary frame order
CABAC entropy coding
Intra: all block types (32x32, 16x16, 8x8, 4x4, and PCM with all predictions)
Inter P: all partitions (from 64x64 down to 8x4)
Inter B: partitions from 64x64 down to 8x4 (including all merge modes
and biprediction)
Weighted prediction for P slices
Multiple reference frames
Ratecontrol: constant quantizer, constant quality, single pass ABR, optional VBV
Scenecut detection
Parallel encoding on multiple CPUs, both frame-level and wavefront parallelism


Linux x265 Install Instructions
# ubuntu packages:
$ sudo apt-get install mercurial cmake cmake-curses-gui build-essential yasm
# Note: if the packaged yasm is older than 1.2, you must download yasm (1.3 recommended) and build it

$ hg clone https://bitbucket.org/multicoreware/x265
$ cd x265/build/linux
$ ./make-Makefiles.bash
$ make


Mac OS X x265 Install Instructions
The latest Mac OS X 10.8 gcc and clang based compilers can build x265 using the linux instructions above. Xcode 5 with the most recent patches can build, debug, and profile x265.




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Alternative to x265 Encoder


DivX HEVC Encoder







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10 reviews, Showing 1 to 5 reviews

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Aug 9, 2017 Version: 2.5+6-d11482e5fedb OS: Windows 7 64-bit Ease of use: 7/10 Functionality: 8/10 Value for money: 10/10 Overall: 9/10



I'll second that, it has some time to go before it unseats x264. I'm sure it will be fine a couple years down the line when hardware has been adapted to it but at the moment the code just drains CPU power, and any video encoded in x265 is a massive decoding nightmare to process it. MX player on android plays it but not smoothly and powers seeps away from the tablet battery same as in any Windows based laptop even with a fast processor. I tried encoding a file in x265 and it was so SLOoooW! Chinese(no offense!) water torture springs to mind. X264vfw is still the tops for me!!!


Jul 1, 2017 Version: stable & nightly OS: Windows 7 64-bit Ease of use: 6/10 Functionality: 7/10 Value for money: 10/10 Overall: 7/10



Long way to go yet as h264 is still the king, but this pretender to the throne keeps getting better and better. Maybe somebody can develop a great GUI like Fairuse Wizard/AutoGK to work with it?


Jun 24, 2017 Version: latest revision OS: Windows 7 64-bit Ease of use: 7/10 Functionality: 7/10 Value for money: 10/10 Overall: 8/10



Let's make this clear h265 is nowhere near as good as h264 in terms of hardware compatibility, visually at high bitrates h264 is still superior and at low bitrates h265 oversmooths/washes out detail. Yes, it might be the codec of the future for 4k/TV presentations etc, but try processing this on your PC even with a super fast cpu and it takes hours for Joe bloggs! Plus you have go know what you are doing using this, most 99.9% are clueless and noobs not fan boys who are having an orgasm over every new build. Many years to go yet before it unseats h264!!!


Jun 23, 2017 Version: latest OS: Windows 7 64-bit Ease of use: 1/10 Functionality: 7/10 Value for money: 10/10 Overall: 5/10



Excellent encoder with really good compression efficiency, even with 8 bit. I have used x264 as well and finding x265 is improving and closing gap with big brother x264.

Job well done.



Jun 2, 2017 Version: x265 v2.4+28-f850cdbe381c OS: Windows 7 64-bit Ease of use: 8/10 Functionality: 9/10 Value for money: 10/10 Overall: 9/10


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