playbin2 blocks with (unreachable) rtsp source

[Federico Zamperini]

Hi,
     I use playbin2 to play a rtsp stream from an IP camera; when I set 
an unreachable uri and try to play (gst_element_set_state(playbin2, 
GST_STATE_PLAYING)) the player blocks the application thread until the 
rtspconnection times out. I thought I would receive a 
GST_STATE_CHANGE_ASYNC instead (as I do when playing a video file), and 
then be notified with an  ASYNC_DONE message on the bus.

I'm using gstreamer 0.10.34

I am wondering if this is the right way to do it; is there a way not to 
block the application (using some gst element property or gst different 
approach)?
Or the only way to go is to start the player from an auxiliary thread?

Thank you

Federico