AAC audio causes stuttering in live video stream playback

I am using the Spark VideoDisplay component and setting the mx_internal bufferTime to 0. (videoDisplay.mx_internal::videoPlayer.bufferTime = 0) I am doing this because I need to have the absolute minimum delay in the live video stream. I am broadcasting video files as a live stream using ffmpeg, through Red5, then to the client. ffmpeg is not re-encoding the video or audio. I am using h.264 video format. I have tried encoding videos using Adobe Media Encoder and ffmpeg.
When I have a video stream only and no audio stream this works fine, but when I have an AAC audio channel with the video, I frequently see the video jitter badly. It looks like the video is quickly going forward and back a few frames. When this problem occurs it will go on for some time and sometimes eventualy starts playing normal. When the video is playing normally the audio sounds fine. When I play the videos in a regular media player (like VLC) they play and sound fine. Also if I use an mp3 audio channel I don't see the jittering
Does anyone have any idea what the cause of this problem might be or how it can be resolved?

Ah, yes, I am not serving high-def video myself. H264 is probably better, but my understanding is that you need hardware acceleration to get good performance from it (again, not an expert on the topic, that's just what my understanding has been...)
This document [pdf] may have some usefull info on choosing an optimal encoding for your needs.
(Or you can see the full lecuture here [Adobe TV])

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AAC audio causes stuttering in live video stream playback

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