the last minute or two missing from the ending credits.
This is what happens when you burn to the margins,you were lucky, you could have lost more than just a few minutes, which is the same as making a coasters.
if compression takes to long on your rig, then I would suggest you consider using Tsmuxer to bring it to a size large enough to fit entirely on the disk, it is also a good way to down convert from True-HD.
just my thoughts