Disable YouTube AV1

• As AV1 is suppressed, YouTube videos are likely to become VP9.
• The availability of all resolutions including 2k and 4k remains unchanged.
• Hardware Decoding might be used for VP9 video depending on System OS & Browser Config.

• Opposite Script: Use YouTube AV1

• Related Script: Disable YouTube AV1 and VP9

Note:

Important Note: Without AV1, currently you can still watch videos in 2K, 4K or above quality.

However, VP9, which is worse than AV1, will be used. (Lower Quality & Lower 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