Looking for a program to trim the credits out of DVD .img file

Hey everyone. I just converted 2 xvid files (1 movie) to an .img file to burn onto DVD. the .img file is too big to fit onto a single layer DVD by about 15 MB. Overburning isnt supported by my burner. Is there any possible way to trim out the credits of the movie to ensure that it fits properly onto the DVD+R?

You need to provide a lot more info. But why not just open the ISO with DVDShrink and shrink it to size? If it’s not an ISO, what is it?