Use YouTube AV1

Please make sure you install the script from greasyfork.org, not fake sites.

• AV1 is highly recommended for Windows 11 and MacOS users. Higher Quality and Lower Bandwidth is provided.

• Opposite Script: Disable YouTube AV1

Important!

For Windows, you must have to install AV1 Video Extension. (edge/chrome/firefox/... etc)

Chrome: including Brave, Cent, etc

Browser Support:

https://caniuse.com/?search=AV1%20video%20format

• Chrome 70+, Firefox 67+, Opera 57+: supported
• Edge, Safari: NOT supported

Note:

Important Note: Some 2K & 4K videos are still running with VP9 and no AV1 encoding is provided.

AV1 will be used over VP9 as possible. (Higher Quality & Higher Compression)

AV1 is not yet supported in hardware decoding.

VP9 is usually supported in hardware decoding in modern PC.

Tests:

• 4K Video: https://www.youtube.com/watch?v=dFlDRhvM4L0
• 1080P: https://www.youtube.com/watch?v=iFIXi6zzCls
• 720P: https://www.youtube.com/watch?v=JLH7_ad0BrI
• 2012 old video: https://www.youtube.com/watch?v=OG6u8CDvpI4
• Video Without AV1: https://www.youtube.com/watch?v=YS1mNPAxnLE

Preview: