Mp3 audio channel problems in h.264 video file

I'm trying to encode an mp4/h.264 video file with an mp3 audio channel. I'm tried encoding it with both Adobe Media Encoder and ffmpeg (using libmp3lame). I'm streaming the video files using ffmpeg to stream the file through Red5 as a live stream. When the Flex AIR clients play the stream (using the Spark VideoDisplay component), I hear a frequent sort of chirping sounding audio artifact. I've also tried playing these files directly from my harddrive in a simple AIR app using NetStream and the Video component. When I try this I don't hear any audio at all. In both tests if I use an FLV (On2 VP6) file with an mp3 channel it sounds fine. Unfortunately I need to use h.264 video.
I've tried using AAC audio but am having a different issue with that: http://forums.adobe.com/message/4096536
Any ideas why I am seeing this audio artifact problem and how to resolve it?

Most h.264 should work.
Have you tried FILE/IMPORT MOVIE and then navigate to the h.264 file?
If that does not work, but the h.264 will play in QuickTIme PLayer, then you can get MPEG Streamclip from Squared 5 (which is free). Drag the h.264 file into MPEG Streamclip. Then FILE/EXPORT TO QUICKTIME. Choose Apple Intermediate Codec for Compressions. You can use this file in iMovie by clicking FILE/IMPORT MOVIE.

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[http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/RTPConnector.html]
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Mp3 audio channel problems in h.264 video file

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