Hello everyone
I did some more tests now, and most things seem to work pretty good so far.
There's one thing that makes watching movies with (not burned in) subtitles a bit a bad experience: Whenever a subtitle is shown, the Image of the video will turn Black and stay black, sound keeps playing normally. This seems to happen every time when a subtitle is shown, so you should be able to reproduce it easily.
I found 2 workarounds, but both are not really nice:
1: After the subtitle disappeared, let the movie play for ~15s, then jump back 10s, that will make the image reappear (simple pause-play won't). However, when this is done too often, the stream hangs and the OPI needs a hard reboot (Kodi is no longer responsive), seems the system doesn't like that skipping much.
2: Disable subtitles completely. This is possible but obviously bad for scenes that require them (e.g. native language dialogs etc.).
Did anyone experience this aswell, were you able to fix it?