> So how should I set the duration, then the audio and video would be sync.
You don't. The way you ensure that your audio and video streams are in sync is by having your server give each (audio and video) frame accurate presentation times - i.e., in the setting of "fPresentationTime" by the (audio and video) "FramedSource" subclasses. If you do this, then the receiving client(s) will properly synchronize audio and video. Ross Finlayson Live Networks, Inc. http://www.live555.com/
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