Nero vision 9 dvd problem

I just converted a 698mb .avi file into a dvd and at the end it said that my dvd which is a 4.73 gig wasnt large enough.

On the nero vision screen just before you press bur disk, it says that 4.37 gigs used out of 4.78 and the quality should be good.

After the whole process of 2 hours and 30 mins it said my disk wasnt large enough.

I am currently using maxell DVD+R

Halp O.o?