[gst-devel] How can I know that playbin2 has created rtspsrc element, as soon as possible?

[wl2776]

I am developing a universal video player, which should be capable to play
RTSP streams also.
I use playbin2. 

I am also doing some coding to the RTSPSrc element to make it able to play
Kasenna streams (it sends x-rtsp-mh messages instead of SDP).

How can I know that playbin2 has created rtspsrc element, as soon as
possible?

I need this because I want to set some properties on this element.
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