[pjsip] 答复: video call

Jason Chen 陈剑桥 Jason.Chen at tpv-tech.com
Thu May 29 23:36:59 EDT 2014

Hi Bill and Gang

thank you very much.

I want to develop a video chat on android,but I do not understand the video flow.
Can I recorded and render the video by myself, and just use the UDP Media Transport to deliver the video stream?
Is there any API  to deliver the video stream?

Or, what better way add video chat?

Best Regards,

发件人: pjsip [mailto:pjsip-bounces at lists.pjsip.org] 代表 Gang Liu
发送时间: 2014年5月30日 10:41
收件人: pjsip list
主题: Re: [pjsip] video call

conf bridge/switch board is only used by audio.
There are video encoding/decoding clock thread polling video flow. And video stream/video port objects are something like audio objects. Also there are converter object inside video port for format/size converting between video stream and video window.    As Bill said, video tee port is connecting preview and encoding stream.
There are some synchronization code at pjmedia. but I didn't read into it.


On Thu, May 29, 2014 at 12:42 PM, Jason Chen 陈剑桥 <Jason.Chen at tpv-tech.com<mailto:Jason.Chen at tpv-tech.com>> wrote:
Hi all
I've read Media Flow, there is the diagram(http://trac.pjsip.org/repos/wiki/media-flow):
[cid:image001.png at 01CF7BF9.1A6D7D50]

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,

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