iPhone 4 wont play Music Videos from iPod app.

My iPhone 4 wont play any music videos in my library that are successfully transferred to the iPhone. I can see all of the videos in the iPod library, but when I tap them, they open, and then it skips to the next non-Music Video song(im on shuffle mode). I've tried unchecking the Sync Music Videos to iPhone in the iPhone > Music tab. And then syncing. It erased the videos, and I opened the ipod app on the iphone. The library updated on the phone. and I was able to play audio files. So then I re synced and enabled music videos again > opened up the ipod app, it said updating ipod library, and still my videos won't play.