match music to photos

I used Photo Story to make a CD. I matched the lenght of the music to the
photos in Photo Story. Then I converted to mpeg file so I could record to a
DVD. After recording with the music my Video played about 2 1/2 min longer
than the music on the DVD. I even tried adding more music and doing it again
but it came out the same as the first, pictures without music at the end. Is
there a way to fix this? Thank you