Lose audio when converting avi to mp4 on quicktime

I've read the discussions on this but can't find a fix so far.
When I try and convert an avi file to mp4 using either quicktime or MPEG Streamclip, I lose the audio. I don't believe I need to download the quicktime mpeg-2 component for mac osx given I have 10.9.1, but perhaps I do (there is debate on this and I'm confused)?
I tried downloading MPEG Streamclip 1.9.3b8 but it seems to want that component to attach itself. Should I therefore buy it - will it work?
Alternatively, should I buy quicktime 7 pro? I really don't want to.
Can somebody help...please?

So I made a successful and audio distortion free ACC/AAC mpeg4 (.MP4) video from Sony Vegas for the Ziio. You are given a choice of audio (I chose 92kbps). The problem is solved. No more distortions. And all this time I was doing twice the work by importing the MPEG- files into Any Video Recorder and converting to .MP4. That was the distortion result. Hope this helps if you're doing the same kind of work by combining video and audio. Otherwise, it's up to you...
Mag

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