It's the nature of the beast, I'm afraid. I tried to use Bluetooth headphones on my big TV in the living room and had the same problem. Too many analog to digital to analog conversions I'm afraid. Do they make VLC player for the iPad? It used to have a setting where you could "sync" the audio to the video by entering a delay time. And there were a set of keys (f and g?) you could press while watching to sync it up.
