Hello, i have a powerful computer (i5-2500k, 8GB Ram, SSD, etc.) and use iTunes to store all my movies & TV shows. My problem if i playback a video file that is coded either 720p or 1080p in itunes i get audio, but just a frozen picture on the screen, i can skip through the file and new frames will pop up but they will just stay frozen on that frame. SD video (480i) files playback just fune in itunes & the exact same HD files that are in my iTunes library playback fine in VLC & Windows Media Player. Even playback of the HD files on my AppleTV is fine, it is just actually trying to watch them in iTunes that doesn't work. If anyone has any ideas on what is causing this, i would appreciate it. I have tried re-installing iTunes and even did a brand new install of windows to see if it would help with no luck.