It could be caused by a number of things -- disc fragmentation, lack of space on your C drive, poor source video.
But when your burn stops 99% of the way in, it usually means that the program isn't interfacing correctly with your DVD burner. You don't say what operating system you're running, but this often happens if you're using Windows 7 64-bit -- although it can also be interrupted by programs like Nero on your system.
Try burning to a folder on your hard drive rather than directly to a disc. If this works, you can just copy the VIDEO_TS folder to your DVD disc using a program like the excellent, free ImgBurn, available online.
Many more details are in my book, if you're interested.