I have been downloading full length videos from YouTube for a site called "KeepVid". When I import the MPEG-4 videos to my iPod nano (4th gen) I get a strange playback issue. Once it gets to around the 10 minute point of the video, the movie goes in fast forward but the audio remains as normal. It seems to go in fast forward for about 15 seconds, then it skips. Within a minute or two the 2 hour video ends. If you try to fast forward the video, the video audio picks up where the video started fast-forwarding. It plays back fine through iTunes. Is there a problem with the youtube converter I am using? Do I need to do something to the iPod?