Need help with video decode acceleration on NanoPi R6S

[Blind55]

I have been pulling my hair out trying to get the acceleration performance (smooth 4K video playback in mpv / chromium) in Armbian (any of the MESA/VPU marked releases) that I am getting from the FriendlyElec distributions. In my naive mind, I thought the MESA/VPU version would get me there, but mpv stutters on 4K videos. I suspect this is because Armbian avoids the proprietary drives. A long time ago, Armbian Ubuntu versions were able to be 'amended' with the Amazingfate/liujianfeng1994 repository, but I have not been able to make that work in a while.

Could someone point me to a guide that allows me to get similar performance with Armbian as I am getting with FriendlyElec?

Thanks bunch in advance!

[Werner]

Providing logs with 

armbianmonitor -u

 helps with troubleshooting and significantly raises chances that issue gets addressed.