Questions how to get more footage on a dvd-r

This is Alonzo from and were currently working on a street racing dvd that is very close to being done. But we currently are having a problem getting all the footage to fit on one dvd-r

I’m using pinnacle studio 9:
When I go to make a video it says that dvd-r doesn’t have enough space

each dvd only wants to put about 28 minutes of footage on it and this happens when I open the movie from any program.

does anyone know how I can get all 80 minutes of the footage on a dvd-r