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{{noteTA
|G1=IT
|1=zh-tw:視訊;zh-cn:视频;
}}

{{lowercase}}
{{Infobox software
| logo = [[文件:x265.png]]
| name = x265
| author =
| developer = MulticoreWare
| latest release version = 4.1<ref>{{cite web|url=https://bitbucket.org/multicoreware/x265/src/ed72af837053d708dee586aa27dac1d63ee0abd6/doc/reST/releasenotes.rst?at=stable&fileviewer=file-view-default|title=multicoreware / x265 / source / doc / reST / Relasenotes.rst — Bitbucket|website=bitbucket.org|access-date=2019-05-07|archive-date=2019-05-07|archive-url=https://web.archive.org/web/20190507052337/https://bitbucket.org/multicoreware/x265/src/ed72af837053d708dee586aa27dac1d63ee0abd6/doc/reST/releasenotes.rst%3Fat%3Dstable%26fileviewer%3Dfile-view-default}}</ref>
| latest release date = {{Start date and age|2024|11|22|df=yes}}
| programming language = [[C++]]、[[汇编语言|汇编]]
| genre = [[视频编解码器]]
| license = [[GNU通用公共许可证]] 版本 2.0 或商业许可<ref name=x265July2013Mission>{{cite news |title=x265 Mission Statement |publisher=Bitbucket |url=https://bitbucket.org/multicoreware/x265/wiki/Mission |date=2013-07-24 |accessdate=2013-07-24 |archive-date=2013-12-14 |archive-url=https://web.archive.org/web/20131214202058/https://bitbucket.org/multicoreware/x265/wiki/Mission }}</ref>
| website = {{url|http://x265.org/}}
}}
'''x265'''是一个用于编码符合[[高效率视频编码]]（HEVC/H.265）标准的影片的[[开放源代码|开源]][[自由软件]]及[[库 (计算机)|函数库]]。<ref name=x265July2013Extreme>{{cite news |title=H.265 benchmarked: Does the next-generation video codec live up to expectations? |author=Joel Hruska |publisher=[[ExtremeTech]] |url=http://www.extremetech.com/computing/162027-h-265-benchmarked-does-the-next-generation-video-codec-live-up-to-expectations |date=2013-07-23 |accessdate=2013-07-23 |archive-date=2015-09-23 |archive-url=https://web.archive.org/web/20150923043214/http://www.extremetech.com/computing/162027-h-265-benchmarked-does-the-next-generation-video-codec-live-up-to-expectations }}</ref><ref name=x265July2013Tom>{{cite news |title=Next-Gen Video Encoding: x265 Tackles HEVC/H.265 |author=Chris Angelini |publisher=[[Tom's Hardware]] |url=http://www.tomshardware.com/reviews/x265-hevc-encoder,3565.html |date=2013-07-23 |accessdate=2013-07-23}}</ref>与[[x264]]项目类似，x265使用[[GNU通用公共许可证]]（GPL）2授权或商业许可证授权提供。<ref name=x265July2013Mission /><ref name=x265RoadMap>{{cite news |title=x265 Development Road Map |publisher=[[Bitbucket]] |url=https://bitbucket.org/multicoreware/x265/wiki/RoadMap |date=2013-07-23 |accessdate=2013-07-23 |archive-date=2015-04-02 |archive-url=https://web.archive.org/web/20150402235810/https://bitbucket.org/multicoreware/x265/wiki/RoadMap }}</ref>

==历史==
x265的开发始于2013年3月。<ref name=x265RoadMap/>MulticoreWare于2013年7月23日对外公布了x265的[[源代码]]。<ref name=x265July2013Extreme/><ref name=x265July2013Tom/>最新版本（4.1）发布于2024年11月22日。<ref>{{Cite web |url=https://mailman.videolan.org/pipermail/x265-devel/2018-May/012093.html |title=存档副本 |access-date=2018-06-09 |archive-date=2018-06-12 |archive-url=https://web.archive.org/web/20180612135822/https://mailman.videolan.org/pipermail/x265-devel/2018-May/012093.html }}</ref>

x265项目由若干家公司资助，这些公司决定着项目的开发需求，并且享有着在它们的产品中使用x265而不需要将产品以GPL 2许可发布的商业授权。<ref name=x265July2013Mission/>
x265项目亦被授予了使用[[x264]]中同样可用于HEVC的源代码的权利。<ref name=x265July2013Mission/>x265的源代码使用[[C++]]及[[汇编语言]]编写。<ref name=x265July2013Mission/>

==技术细节==
x265支持HEVC的Main、Main 10及Main Still Picture配置，使用每采样8位或10位[[色彩深度|深度]]的4:2:0、4:2:2或4:4:4[[YCbCr]][[色度抽样]]。<ref>{{Cite web |url=http://x265.readthedocs.org/en/default/cli.html?highlight=color%20space#cmdoption--input-csp |title=存档副本 |access-date=2014-11-13 |archive-date=2015-08-01 |archive-url=https://web.archive.org/web/20150801021819/http://x265.readthedocs.org/en/default/cli.html?highlight=color%20space#cmdoption--input-csp }}</ref>
x265支持大部分x264有的特性，包括所有码率控制模式（固定QP、固定码率因子、平均比特率、二次或多次编码及{{Link-en|影片缓冲区校验器|Video Buffering Verifier}}码率控制）。<ref>{{Cite web |url=http://x265.readthedocs.org/en/default/ |title=存档副本 |access-date=2014-11-13 |archive-date=2016-04-27 |archive-url=https://web.archive.org/web/20160427084512/http://x265.readthedocs.org/en/default/ }}</ref>视觉质量算法包括CU树（{{langx|en|CU-Tree}}，x264的[[宏区块]]树的继任者）、自适应量化、B-pyramid、加权预测及心里视觉优化（psy-rd和psy-rdoq）。亦支持完全无损模式。

==使用==
x265既可作为命令行应用程序使用，也可以通过[[应用程序接口]]集成到别的应用程序。<ref name=x265CLI>{{cite news |title=x265 CLI Documentation |url=http://x265.readthedocs.org/en/default/cli.html |accessdate=2014-11-13 |archive-date=2016-04-23 |archive-url=https://web.archive.org/web/20160423172509/http://x265.readthedocs.org/en/default/cli.html |dead-url=yes }}</ref><ref name=x265API>{{cite news |title=x265 API Documentation |url=http://x265.readthedocs.org/en/default/api.html |accessdate=2014-11-13 |archive-date=2016-03-29 |archive-url=https://web.archive.org/web/20160329113053/http://x265.readthedocs.org/en/default/api.html |dead-url=yes }}</ref>

==参考==
{{Portal|自由软件}}
*[[x264]] – 一款开源的[[H.264/MPEG-4 AVC]]影片编码器
*[[高效率视频编码]] – 一种由ISO/IEC MPEG和ITU-T VCEG开发的[[视频编码]]格式

==引用==
{{Reflist|30em}}

==外部链接==
* [https://web.archive.org/web/20191010085833/http://x265.org/ x265 HEVC（H.265）编码器 - 主页]{{en}}
* [https://bitbucket.org/multicoreware/x265/overview x265 HEVC（H.265）编码器 - 代码仓库] {{Wayback|url=https://bitbucket.org/multicoreware/x265/overview |date=20150512015754 }}{{en}}
* [http://x265.readthedocs.org/ x265说明文档]{{en}}

{{多媒体压缩格式}}
{{压缩软件}}

[[分类:C++函式库]]
[[分类:文件格式]]
[[分类:有损压缩算法]]
[[分类:影片压缩技术]]

[[Category:视频编解码器]]
[[Category:跨平台軟體]]

X265 - 版本历史

imported>Roach Lin：​bump version

imported>Roach Lin：bump version