I've created an ISO image of a (movie) DVD using Burnatonce (Raw reading from a Plextor CD/DVD drive), mounted it with Daemon tools and tried to play.
The trailer and menu displayed correctly, but once the real film started, everything became garbled. When playing from the original DVD, the film displayed just fine.

Any hints how I might find out what the problem is? Does Daemon tools support mounting for DVD playback? Is there a way to check whether the ISO image is corrupt?

Thanks for any help!