[chkdsk]

MmmMMm what is your problem when you play video higer than 720p ? Is it stuttering ? Have you try to change the framerate to 60hz ?  

I have an Nvidia Shield TV. And for that running addon, it is necessary to turn off hardware acceleration right? But when i do that, i cant play videos higher than 720p. All movies, even 1080p are stuttering like hell. Some 4k movies quit immediately. It doesn't matter which kodi version i choose. Most movies are h264 or h265. so i cant use the yeemee addon. Any solutions for that? Nvidia Shield TV and Kodi are running on 60Hz 

Yes you need to turn off HW acceleration but it should work with Full HD and 4K videos. On my shield, it has always work since a few week. (see my post below)
Are you sur that movies are play @60hz ? add full hd@60hz resolution to your white liste in kodi

I did a test at home. Without hardware acceleration it is not possible to play a 4k movie. In settings I have choosen 1080p 60hz