I found some 4K Matroska video films that cannot be played in 12.2.0 and 13.0, but yes in 9.0 ¿? After a pair of minutes playing, they start to pixelate the image, pause and finally stop with the screen in green colour. Even sometimes Kodi reboots.
I use the same hardware and settings during the tests (an Odroid-C2).
Any idea?