>>106286586
I think the hardware decoder used for AVIF images is different than the one used for actual AV1 video. Testing for this shouldn't be too difficult, you only need say a high resolution 4K AVIF image like this one.

https://files.catbox.moe/uafv5j.avif

How quickly did that load on your phone? If it loaded in like 0.1 seconds then congrats you have AVIF hardware decoding but for some retarded reason no AV1 video hardware decoding.