VP9 HW decoding not available with AMD GPUs on macOS
Playing back 4K YouTube videos on macOS uses software decoding, when the only GPU available is from AMD, despite the GPU being capable of VP9 decoding. Unsure if macOS's AMD drivers just don't have VP8/VP9 decoding baked in at all.
Opaite Mbohovái (1)
Dropa said
For Video driver issue you need to contact AMD support and for codec video playback issue you need to check with the site if you use codec plugins. And what error screenshot is it showing you?
It’s not a video driver issue as far as I know, you should be the ones to know though.
This is macOS we’re talking about, and your software. Not Apples or AMD’s.