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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: Win Mac Linux
File size: 1MB
Portable version
Other versions
Version history
7.2/10
16 votes
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Screenshots

x265 Encoder screenshot
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Latest version

3.3 (February 17, 2020)



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Download x265 Encoder 3.3 Windows  1MB  Win  Portable

Download x265 Encoder 3.3 Mac  Mac

Download x265 Encoder 3.3 Linux  Linux




Download other versions

Download x265 Encoder 3.3 from another mirror site  Win



Software License

Free software / FOSS (Free download and also Free and Open Source Software)



Supported operating systems

WinWindows MacMac OS LinuxLinux



More information and other downloads




Version history / Release notes / Changelog


Version 3.3
Release date - 17th February, 2020.

New features
Adaptive frame duplication to identify and skip encoding of near-identical frames and signal the duplication info to the decoder via pic_struct SEI. frame-dup to enable frame duplication and --dup-threshold to set the threshold for frame similarity (optional).
Boundary aware quantization to cut off bits from frames following scene-cut. This leverages the inability of HVS to perceive fine details during scene changes and saves bits. --scenecut-aware-qp , --scenecut-window and --max-qp-delta to enable boundary aware frame quantization, to set window size (optional) and to set QP offset (optional).
Improved scene-cut detection using edge and chroma histograms. --hist-scenecut to enable the feature and --hist-threshold (optional) to provide threshold for determining scene cuts.
Enhancements to existing features
--hme-range to modify search range for HME levels L0, L1, and L2.
Improved performance of AQ mode 4 by reducing memory foot print.
Introduced --analysis-save-reuse-level and --analysis-load-reuse-level to de-couple reuse levels of --analysis-save and --analysis-load. Turnaround time of ABR encoding can be reduced by properly leveraging these options.
Encoder enhancements
Improved VBV lookahead to eliminate blocky artifacts in Intra frames coming towards end of the title.
API changes
New API function x265_encoder_reconfig_zone() to invoke zone reconfiguration dynamically.
Renamed --hdr to --hdr10. --hdr will be deprecated in the upcoming major release.
Renamed --hdr-opt to --hdr10-opt. --hdr-opt will be deprecated in the upcoming major release.
Additions to x265_param structure to support the newly added features and encoder enhancements.
Bug fixes
Output change in --analysis-load at inter-refine levels 2 and 3.
Encoder crash with zones.
Integration issues with SVT v1.4.1.
Fixed bug in --limit-tu 3 and 4 while loading co-located CUís TU depth.

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.




Sections/Browse similar tools






Alternative to x265 Encoder


DivX HEVC Encoder







Guides and How to's


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16 reviews, Showing 1 to 5 reviews


I'm not seeing a great range of hardware even in high spec computers that can utilise as yet hevc codec/h265 in 2020 nor being able to give fast encoding speeds and take full advantage of its compression abilities. Maybe some NASA super computer or commercial outlet rather than Joe Blogs can use it?

Let's be honest at high bitrates H264 and H265 are more or less the same and for me h265 still washes out fine details in videos. It is only the lower nitrates which h265 excels at for streaming, much like the same when they said h264 was superior to xvid at lower bitrates when it(h264 etc) first dominated and still does the downloading scene formats.


Review by Al on Feb 18, 2020 Version: 3.3 OS: Windows 7 64-bit Ease of use: 5/10 Functionality: 7/10 Value for money: 10/10 Overall: 5/10




Excellent software from a compression point of view, but torturous to set up and like Chinese water torture to encode. This is commercial application only. H264 is enough for me. It has been around for a bit now and the lack of H265 encoding out there shows this might never take off. Most users hardware can't cope with it even after all this time. That said it is the future, but when? For TV streaming only.

Review by Wesley on Jun 18, 2019 Version: 3.1 OS: Windows 10 64-bit Ease of use: 1/10 Functionality: 7/10 Value for money: 10/10 Overall: 5/10




Superb quality output, but mega mega slow and a pain to use/set up.

Review by Paulo on Oct 7, 2018 Version: 2.9 OS: Windows 7 64-bit Ease of use: 1/10 Functionality: 9/10 Value for money: 10/10 Overall: 6/10




I'd guess most will have no idea how to use this at all! You need the hardware and power to use it well. Try playing this on a tablet etc and watch your battery drain superfast. Decoder cant keep up with h265 encoded video frames. Might be ready in 5 years!!

Review by Paulo on Jul 5, 2018 Version: 2.8 OS: Windows 7 64-bit Ease of use: 5/10 Functionality: 7/10 Value for money: 10/10 Overall: 7/10




Most won't have a clue how to use it and will need a GUI. This codec is only worth using if you need small bit rates as it excels and you only need to use half as h264. Quality of h264/h265 is same at higher bit rate so they say, but h265 still washes out detail. Who wants to use low bit rate these days or has the CPU power to decode it on a PC or tablet as yet?

Long way to go before any compatible hardware addresses the huge power needs of this codec. Also enclosing takes ages with this codec. H264 is still the daddy!


Review by Tony on May 25, 2018 Version: 2.8 OS: Windows 10 64-bit Ease of use: 1/10 Functionality: 7/10 Value for money: 10/10 Overall: 7/10


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