In Linux everything works without issues. I sometimes have music videos playing on the background and videos may pause after a while (30, 60 min maybe? not sure) but that's about it.
In Android no delays and no ads, but I manually set resolution to 720p on my tablet and occasionally the video stutters a bit and drops to auto(360p). I mostly use it to listen to music videos and the audio keeps going during and after res drops so that's fine; since I'm listening and not looking at the video I don't even notice it happening. Resolution drops sucks when looking at the videos (vs listening to music) like when watching a documentary but I do that usually in landscape and I find resolution drops happen less often than when I'm using portrait/vertical mode for music.