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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:2.4 Stable / 2.4+28 Nightly
Released:May 26,2017
File size:1MB
5 votes

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x265 Encoder screenshot
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Latest version

2.4 Stable / 2.4+28 Nightly (May 26, 2017)


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Download x265 Encoder 2.4 Stable  [1MB]  [Win]  [Portable]

Download x265 Encoder 2.4 Stable 64-bit  [~1MB]  [Win64]  [Portable]

Download beta, Mac, Linux, mirror and other versions

Download x265 Encoder 2.4+28 Nightly  [Win]

Download x265 Encoder 2.4+28 Nightly 64-bit  [Win64]

Download x265 Encoder 2.4 Stable from another mirror site  [Win]

Download x265 Encoder Mac version  [Mac]

Download x265 Encoder Linux version  [Linux]

Supported operating systems

WinWindows MacMac OS LinuxLinux


Free software

More information and other downloads

Version history / Release notes / Changelog

2.4+28 Nightly

Bhavna Hariharan Support high payload size 2017-05-23
Bhavna Hariharan fix initialization and add JSON file documentaion 15 hours ago
Bhavna Hariharan add condition to handle i400 7 hours ago
Bhavna Hariharan Insert additional fields in csv file 9 hours ago
Gopi Satykrishna Akisetty rc: Use RcStats information if available from pic_in 2017-05-17
Gopi Satykrishna Akisetty rcStats: add more fields to rcStats 2017-05-17
Vignesh Vijayakumar SEA motion search:Enable asm primitives for integralv functions 2017-05-08
Jayashri Murugan avx2:'integral32v' asm code-> 7.93x faster than 'C' version integral_init32v 7.93x 191.18 1516.95 2017-05-08
Jayashri Murugan avx2:'integral24v' asm code-> 7.30x faster than 'C' version integral_init24v 7.30x 207.58 1515.26 2017-05-08
Jayashri Murugan avx2: 'integral16v' asm code -> 7.25x faster than 'C' version integral_init16v 7.25x 203.12 1472.09 2017-05-08
Vignesh Vijayakumar avx2:'integral12v' asm code-> 7.48x faster than 'C' version integral_init12v 7.48x 206.80 1545.53 2017-05-08
Vignesh Vijayakumar avx2:'integral8v' asm code-> 7.32x faster than 'C' version integral_init8v 7.32x 201.03 1470.88 2017-05-08
Praveen Tiwari avx2: 'integral4v' asm code -> 7.48x faster than 'C' version integral_init4v 7.48x 202.53 1515.14 2017-05-04
Vignesh Vijayakumar SEA Motion Search: AVX2 framework of integral functions 2017-05-03
weixuan add functions in the picyuv to support pre-allocated luma pixel buffer 7 hours ago
Vignesh Vijayakumar Force modes or qp based on the CTUInfo recieved through API 2017-04-11
Vignesh Vijayakumar Infer if currentPOC CTUInfo has changed with respect to its references 2017-04-11
Vignesh Vijayakumar Influence depth decisions based on CTUInfo recieved through API 2017-04-11
Santhoshini Sekar Add API to read CTU Information 2017-04-24
Pradeep Ramachandran Merge with stable 2017-05-09
Bhavna Hariharan dhdr10: fix warnings in windows Branches stable 2017-05-05
Ma0 cmake: restore order of options changed by commit d00f2f5 (important for GCC < 6) Branches stable 2017-05-05
Bhavna Hariharan fixes encoder crash when userSEI is present (issue #340) Branches stable 2017-05-03
Pradeep Ramachandran Merge with stable 2017-05-02
Ma0 cmake: set '-std=gnu++11' for GCC if ENABLE_DYNAMIC_HDR10 is on 2017-04-20
Ma0 silence MSVC warning C4334 and GCC warnings for '-std=gnu++11' 2017-04-20
Ma0 CLI: small fixes for dhdr10 2017-04-20
Bhavna Hariharan dhdr10:fix linux build error 2017-04-24

Version 2.4

Release date - 22nd April, 2017.

Encoder enhancements
HDR10+ supported. Dynamic metadata may be either supplied as a bitstream via the userSEI field of x265_picture, or as a json jile that can be parsed by x265 and inserted into the bitstream; use --dhdr10-info to specify json file name, and --dhdr10-opt to enable optimization of inserting tone-map information only at IDR frames, or when the tone map information changes.
Lambda tables for 8, 10, and 12-bit encoding revised, resulting in significant enhancement to subjective visual quality.
Enhanced HDR10 encoding with HDR-specific QP optimzations for chroma, and luma planes of WCG content enabled; use --hdr-opt to activate.
Ability to accept analysis information from other previous encodes (that may or may not be x265), and selectively reuse and refine analysis for encoding subsequent passes enabled with the --refine-level option.
Slow and veryslow presets receive a 20% speed boost at iso-quality by enabling the --limit-tu option.
The bitrate target for x265 can now be dynamically reconfigured via the reconfigure API.
Performance optimized SAO algorithm introduced via the --limit-sao option; seeing 10% speed benefits at faster presets.
API changes
x265_reconfigure API now also accepts rate-control parameters for dynamic reconfiguration.
Several additions to data fields in x265_analysis to support --refine-level: see x265.h for more details.
Bug fixes
Avoid negative offsets in x265 lambda2 table with SAO enabled.
Fix mingw32 build error.
Seek now enabled for pipe input, in addition to file-based input
Fix issue of statically linking core-utils not working in linux.
Fix visual artifacts with --multi-pass-opt-distortion with VBV.
Fix bufferFill stats reported in csv.

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
$ 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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5 reviews, Showing 1 to 5 reviews

this doesnt work AT ALL, you dowload it, you execute it, and then a black screen opens and close in a fraction of second

May 7, 2017 Version: 2.153 OS: Windows 7 Ease of use: 1/10 Functionality: 1/10 Value for money: 1/10 Overall: 1/10

No comments

Mar 30, 2017 Version: 2.1 OS: Windows 10 64-bit Ease of use: 5/10 Functionality: 8/10 Value for money: 10/10 Overall: 9/10

Xvid style encoder were every preset is pleasing for the eye in contrast to x264 were only Placebo prevents eye cancer but there is one huge problem as it looks artificial as there is a film over it (others called it washed out)

Oct 23, 2015 Version: OS: Windows 8 64-bit Ease of use: 5/10 Functionality: 5/10 Value for money: 5/10 Overall: 5/10

I have been using the stable version non stop with excellent results. Far more superior than x264 and this is only the beginning. A big thank you to the developers for this amazing encoder.

Oct 10, 2015 Version: 1.8.31 OS: Windows 7 64-bit Ease of use: 10/10 Functionality: 10/10 Value for money: 10/10 Overall: 10/10

5 reviews, Showing 1 to 5 reviews

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