I have a Sony X850C 65" 4K TV, and I have set it up with Kodi to stream stuff from my pc to the tv. When I play 4K videos on Youtube, playback is smooth and clear. When I stream 4K movies from my PC to Kodi, the playback is very stuttery, but after some digging around I found out its just a Kodi problem, and playing the same files through the Android TV VLC app is crystal clear and smooth. BUT, if I transfer any 4K video onto a USB drive and then plug it into the tv and play it through VLC, the playback is absolutely terrible. Audio is fine, but video becomes a slideshow, or just a still picture that doesnt move. I've tried disabling hardware accelaration but it doesn't fix the problem.
I find this confusing, shouldn't the playback directly from a USB be even smoother and faster than streamed content ? I tried the USB thing because my ISP has been having some trouble the past month and buffering is a real pain...
i get the same issue on my 830c. apparently the processor on the tv isnt good enough to handle kodi doing 4k.