X265
 |
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| Developer(s) | MulticoreWare |
|---|---|
| Initial release | 2013 |
| Stable release |
2.3 / 15 February 2017
|
| Repository | bitbucket |
| Development status | Active |
| Written in | C++, Assembly |
| Standard(s) | HEVC |
| Type | Video codec |
| License | GPL 2 / commercial license |
| Website | x265 |
x265 is a library for encoding video into the High Efficiency Video Coding (HEVC/H.265) video compression format that was developed and standardized by the ISO/IEC MPEG and ITU-T VCEG. x265 is offered under either version 2 of the GNU General Public License (GPL) or a commercial license, similar to the x264 project.
Judged by the objective quality metric VQM in 2015, x265 delivered video quality on par with the reference encoder of the royalty-free VP9 format that competes with HEVC. A codec comparison from 2015 found x265 to be a leading HEVC implementation measured by SSIM metric. In August 2016, Netflix published a comparison of x264, VP9, and x265 using video clips from 500 movies and TV shows using 6 different quality metrics and found that both VP9 and x265 have 40–50% better quality at 1080p than x264. Netflix stated that with the VMAF metric (which closely mirrors human visual experience according to the author) x265 performed substantially (19% to 22%) better than VP9.
x265 builds on source code from x264, an open source video encoder for the previous MPEG video coding standard H.264/MPEG-4 AVC. The project has licensed the rights to use the x264 source code for those features that can be used with HEVC. Development on x265 began in March 2013.MulticoreWare made the source code for x265 publicly available on July 23, 2013.
The x265 project was initially funded by a small group of charter licensee companies that direct the development requirements and receive commercial licenses to use x265 in their products without having to release their products under the GPL 2 license.
In February 2014, x265 was integrated into the popular multimedia transcoding tool FFmpeg and its fork Libav.
Version 1.0 was completed in May 2014. The stable version (2.0) was released on July 14th, 2016.
x265 source code is written in C++ and assembly.
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