[pjsip] video call

Bill Gardner billg at wavearts.com
Thu May 29 12:40:18 EDT 2014


For video there is no conference bridge, the video device is connected 
directly to the video stream. There is a video tee port object which 
allows the camera device to feed both a video preview window and the 
outgoing stream. Audio and video are recorded separately and have 
separate stream objects and RTP streams. Synchronization is 
theoretically possible at the receiving endpoint using RTP timestamps, 
but I don't think PJSIP implements any stream synchronization (I could 
be wrong).


On 5/29/2014 12:42 AM, Jason Chen ??? wrote:
> Hi all
> I've read Media Flow, there is the 
> diagram(http://trac.pjsip.org/repos/wiki/media-flow):
> I have some question about video call.
> 1, I can understand it in the voice call, but when make a video call, 
> does it work in the same way?
> 2, Video calls, including images and sound.  Are image and sound are 
> recorded separately?
> 3, How sound and image are synchronized
> Best Regards,
> jason.chen
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