Gwynbleidd

So I have a problem with my slideshow getting cut off before the end. If I chose the DVD-Movie disc or Blu-ray-Movie disc option during export, the slideshow is really grainy and low quality (but has the full length of the slideshow). If I choose the DVD or Blu-Ray data disc option, the slideshow looks great. But it cuts off the slideshow at the 47 minute mark instead of the full 59 minutes, regardless of whether I'm using a DVD or Blu-ray disc. My blu-ray disc can hold 25GB, and the file is no where near that long. So I either can have the full slideshow with bad quality, or an incomplete version of it with good quality. Anyone know how to resolve this?