I believe you are referring to the layer break. If you burn the movie with ImgBurn, it will offer a choice of the best layer breaks available. Sometimes there is only one, and in very rare cases, there isn't a good choice.
If you run into one of those, called "The End of the World" error in ImgBurn, you should follow this guide to make one: http://forum.imgburn.com/index.php?showtopic=6376
The movie itself doesn't split, and shouldn't have any hesitation in playing back. This is where the burn goes from the first layer to the second one on the physical disk.