Audio and Video off sync in a few movies in my library

Hello everyone, I have about 1500 movies in my iTunes library and two ATV. One ATV is in my family room along with my Mac Pro and timecapsule, the other ATV is two floors up in my bedroom. Some movies that are played in my family room play off sync with the audio 5-10 seconds behind video.
I play the same movie in my bedroom and it plays fine. I use a 3rd party app to convert my DVD's to mp4. I don't have a problem with HD pic and 5.1 dolby just audio/video off sync. Does anyone have any answers or the same problem

I have looked a little bit more, and it seems as though the video is lagging behind, not the other way around. Video seems choppy, but the audio is playing perfectly. Music Videos are suffering from the same problem as well. Also, when I sync to my iPod Touch 16GB, audio & video match up perfectly.
I still have no idea how to fix this. Please help.

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