[Live-devel] hasBeenSynchronizedUsingRTCP()

[Ross Finlayson]

On Jul 29, 2011, at 11:15 AM, Jeff Shanab wrote:

> Thanks that explains it, the last firmware upgrade allows us to disable audio.
>  
> The PTS still jumps even for video only

That suggests that the camera does, indeed, send RTCP "SR" packets.  See http://www.live555.com/liveMedia/faq.html#rtcp-synchronization-issue


> , do I need to explicitly request sync of the video stream when I only want video?

The "hasBeenSynchronizedUsingRTCP()" function does not 'request' synchronization; synchronization happens automatically off RTCP "SR" packets are received.  The "hasBeenSynchronizedUsingRTCP()" function merely tells you whether the received presentation times can be considered accurate.


> One last question, does sync offset the PTS and allow it to appear as if it is the same ntp stamp as the receiver?

I don't understand this question.  But application code should never need to concern itself with RTP timestamps.  Just work with "presentation times".


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

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