It seems every video I try to watch has a different issue. I have had my iPad 4 for over four years, and I usually give up trying for about a year at a time - and watch vids on my Android phone (seamlessly) or my Windows PC (with nary a hitch), and even on my Samsung teevee off a USB stick. But I'm getting on a long flight, and appreciate Apple's battery power. I have three movies - two MP4 and one MKV. I dragged the MP4's into the native "TV" app using iTunes, and the MKV into PlayerXTreme. One of the MP4s is fine. One has no sound - even though it has sound on the PC and on Android phone. The MKV's video is in super slo-mo, maybe a few frames per second, while its sound is fine. (In other words, by the end of the first minute, the title music is wrapping up but the onscreen lion is still trying to roar). I have uninstalled and reinstalled PlayerXTreme. I have tried in VLC Player. I am on 10.3.3. ARGGGGGHHHH!!!!