Stuttery avi. playback on dvd player

[Triumphdog]

I have a DVD player that supports divx, avi, mpeg, etc. Now some of the video files that I burn to a data dvd and then playback are GREAT looking and playback smooth. Others, they playback and look sometimes like they are in slow motion or just a bit slower looking then other ones. The thing is, while viewing them on my PC they look great, but after buring them some of them dont turn out to well, but others playback just the same. Would this have to do with bitrate or FPS? Any ideas?