Sync of Video and Audio streams

I got a main project to make a video conferance system. And i'm not sure how to sync the video and Audio streams. (Audio need to have higher priority than video)
Video is all moust real-time but audio is around 0.5 sec delay at the fastest.
I realy need to find out how to sync them since its one of my main subjects in the project.
So if anyone know how to, plz let me know.

Hello,
I try to implement a videoconference in Java with JMF. At the reception, audio and vid�o aren't synchronizing. I'm looking for a solution to resolve this problem because i think in this kind of application, audio and video tracks must be synchronized. I'd like to know when and how can i do the synchronization : at the capture, before transmission, or at the reception ?

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