In this article, I'll address why some MPEG files buffer/load completely before playing and then give you several solutions to resolve this issue. For some background, it's well documented that MPEG-4 files could buffer completely before playing from a website. If you have a very small video, this might not be an issue. With video times of 15, 30, or even 60 mins+, it can be a real issue for many site builders. Even my 4 min videos were driving me nuts...