I'm asking if there are any RPi4 users here who also have a 4K HDTV willing to test out the kodi-rbp4-git package with a freely available x265 movie source. For my test machine on a cheap 4k display (no built in audio), I see visual artifacts when I try playback @ 4k that aren't there @ 2k.
To test, just install the package which is currently in the repos. https://s3.amazonaws.com/x265.org/video/BigBuckBunny_2000hevc.mp4 is a link to the test video. The question is simple: does it play back smoothly and artifact free @ 4k?