>       I saw the DeviceSource code in live555 project.
>       I found that the the fPresentationTime would be set by gettimeofday 
> when doGetNextFrame is called.
>       I remembered you said the fPresentationTime must be same at the first 
> time,        So how should it sync audio and video? 

If the "fPresentationTime" value is accurate, and aligned with 'wall clock 
time' (the time that you'd get by calling "gettimeofday()"), then audio/video 
synchronization will happen automatically - see 
http://www.live555.com/liveMedia/faq.html#separate-rtp-streams

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/

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