Disable YouTube AV1 and VP9

• As use this script, you will disable both AV1 and VP9 so all your YouTube videos are likely to become AVC1.
• You will be beneficial by hardware decoding but some high resolutions like 2k and 4k will no longer be available.

• Opposite Script: Use YouTube AV1

• Related Script: Disable YouTube AV1

Note:

Important Note: Without AV1 and VP9, some high resolution modes of videos might not be available in AVC1. (e.g. 2k & 4k)

AV1 is not yet supported in hardware decoding.

VP9 is usually supported in hardware decoding in modern PC.

AVC1 will be used instead which is usually under hardware decoding.

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