If you use URL with prefix "elecard://", the first filter in graph is Elecard NWSourcePlus. And it builds the graph and waits for creating of output pins.
Please write if you have the problems with using of NWSourcePlus for RTP+FEC streaming.
If you use your PushSource you should do these actions in it.
If you purchased our SDK, please write an email to firstname.lastname@example.org
and we will give you more detailed advice on using of Push Demultiplexer.