Well my brother got me a clip from a movie that I wanted to see. But when ever i played it (in Quicktime 7 or VLC) in quicktime an error message would pop up and it and VLC wouldn't have sound. He said i needed a codec called AC3. So I downloaded it and it said to put it in library/Quicktime. I did and now when i start it up in Quicktime I don't get the error sign it just plays for a minute and then Quicktime enexpectantly quits, what can I do to hear this Video? I have ffmpeg, can i convert it into another file type and view it like that? Thanks for the help