I'm using a program (MDRP) to rip my DVDs into m4v files and I think the 5.1 audio on the DVD is being mangled during the conversion. It's too hard to tell exactly what's going on by watching/listening to the converted movie because everything is changing too dynamically. Is there a small DVD iso in existence containing some audio test patterns (e.g. "this is the front left speaker, this is the rear right speaker...") that I can pass through my ripping software to confirm what's happening to the converted audio? I've scoured the web for over an hour and couldn't find anything in DVD iso format that would do the trick. Many thanks in advance.