title: AVFoundation (AVPlayer) supported formats? No .vob or .mpg containers?
body: <p>Using AVPlayer in a Mac app here to play random videos in fullscreen from a folder, but when I try to play .vob files or .mpg files I just get a black screen that lasts as long as the video lasts.</p>
  
  <p>Does AVFoundation not support playback from these containers? I figured that since they were playable with stock QuickTime Player they would also work with AVPlayer.</p>