[Mp4-tech] Help on Delivery of MPEG-4 stream over IP networks

[Gaofeng Yue]

Dear All,
I have some questions about the MPEG-4 stream transport over IP networks.
Suppose that a compueter is equipped with a camera and a microphone.
Video and audio are generated and encoded in real time according to MPEG-4
encoding standard.
Normally, how are these streams transmitted over Internet in real time
for interactive communication? Are they transmitted over separate RTP
channels? Or they are multiplexed in synchronization layer and then
transmitted in a single stream over RTP?
In current most implementations, with respect to streaming delivery over
Internet, do they follow MPEG-4 system architecture standard to develop
components such as DMIF, Flexmux, multiplexing SL packets, synchronization
between streams, and DAI? If so, are there any open source? would you
please tell me the links to these implemenations?
I appreciate your help.
Gaofeng