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2018.11.15 04:03

FFmpeg 4.1 正式发布，支持 AV1 编码 MP4，shanaencoder会更新吗？

小樱
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http://trac.ffmpeg.org/wiki/Encode/AV1

 

微软已经通过Microsoft Store发布了针对Windows 10的全新AV1视频编解码器的支持。
AOMedia Video 1（AV1）是一种开放的、免版税的免费视频编码格式，专为通过互联网进行视频传输而设计。它由开放媒体联盟（AOMedia）开发，旨在成为VP9的继承者，而不依赖任何MPEG专利。
谷歌Chrome浏览器v70上线：新增AV1解码器，也是支持新AV1视频编解码器的第一个浏览器版本。
意思是av1可以用于web播放并且是免费的，不像265拥有4种专利费，，价格极其昂贵
而且，嗯，av1压缩率比265更加大得多，i5 8400软解码1080P AV1占用率基本在8%左右
265比264少了三分之一，av1比265少了一半吧，而且av1编码速度和264差不多，而且完全免费可以用于任何用途
具体压缩率之后要试试，对标是265少一半，实际效果还没试过，速度是看网上数据，不过有些也说比265还要慢的文章，，既然微软发布了，，等会去试试，希望shanaencoder也尽快加入支持，毕竟FFmpeg基本上基于纯命令行，很多人不会用。可以先发行一个测试版本用于test video。

 

youtube 开启av1支持
用更少的数据流量观看更多的视频
AV1 视频编解码器具有高级压缩功能，可让您更流畅地在线播放高清视频并随时随地以更少的数据流量观看更多视频。
由于这是一项新技术，因此采用 AV1 在线播放高清视频需要一台功能强大的计算机，并且目前只有部分视频支持 AV1。 选择采用 AV1 在线播放标清视频时，系统会对画质不超过 480p 的视频采用 AV1，而对更高画质的视频采用 VP9。
https://www.youtube.com/testtube

youtube av1 1080P 30FPS测试视频：

1.png

 

https://www.youtube.com/watch?v=2nXYbGmF3_Q

 

 

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    小樱 2018.11.15 04:45

    测试了下，ffmpeg.exe -i mv101.mp4 -c:v libaom-av1 -crf 30 -b:v 0 -strict experimental -cpu-used 8 test.mp4

    i5 8400只能利用1颗CPU核心占用率为16%，480x852分辨率，编码速度为1.7fps

     

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    JKyle 2018.11.15 08:34

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