hi, danboid ，Thank you 
My English is not good, here is the machine translation。
NO, VF2 cannot decode 4K videos，can only 1080p。
You saw my message, it was a few months ago。
I haven’t used archLinux-cwt for several months。
The software of archLinux is very new，good 
。But the best decoding is debian2409。
I suggest using archLinux-cwt and debian2409 together。Work using archLinux-cwt, Video entertainment with debian2409。
Or you can try archlinux-cwt + debian2409 , Multi Boot。
I hope my answer ，can help you clarify your doubts。 
hi, cwt。I guess you can see it，Thank you！Previously helped me。 