I just bought an HD movie on iTunes, and much to my chagrin, I wasn’t able to watch it. The video was OK, but the audio was out of sync, and constantly stuttering.
Here’s the solution:
- Control Panel -> Sound
- Right click the speakers you’re using, hit “properties”.
- Click the “advanced” tab.
- Choose “24-bit 44100Hz”
Mine was set to 19200Hz, and that was the problem!
For reference – I have a Xonar DX. The PCM setting in the Xonar application didn’t make a difference – it had to be changed in windows, as per above.