Problem Solved.
I downloaded MPEG Streamclip for Mac OS here:
http://www.squared5.com/
Had to make sure the m2v and aiff files have the exact same name, then opened the MPEG Streamclip app and just opened the m2v file...it brings in the aiff file with it automatically. Then chose File/Convert to MPEG with MP2 audio
In case anyone is interested...