Did you review prior answers with https://www.google.com/search?q=Converting+QuickTime+movie+to+MPEG
?
Bob
I have taken several animated gif images and made a QuickTime movie of them using the QuickTime Player 7. Then I added sound to it also using the QuickTime Player 7. The movie plays wonderfully well with the added sound in Quicktime Player 7 and in RealPlayer as long as it is a QuickTime movie. But when I convert it to an MPEG movie, it does not retain the sound. What am I doing wrong?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic