I have an UHD clip (from Interstellar) that can cause playback problems, i.e. extreme stutter, on my Minix U9-H. I think because of the high bitrate in the clip. However, so far CoreELEC was able to play it just fine. Today I did some testing with CoreELEC-S912.arm-9.0-nightly_20181214 and the stutter was back. I hadn’t updated in a while so I could only revert to CoreELEC-S912.arm-9.0-nightly_20181111.tar, in which there is no stutter.
I uploaded the clip here if someone would like to try:
Is there a way to revert nightly builds in between, so I can check in what version the problem came back?