rtspsrc: not-linked after a while

Submitted by Nicola @drakkan

Link to original bug (#739419)

Description

Created attachment 289691
debug logs

I have an rtspsrc stream that stop with this error:

gstbasesrc.c(2932): gst_base_src_loop (): /GstPipeline:pipeline0/GstRTSPSrc:rtspsrc0/GstUDPSrc:udpsrc1:
streaming task paused, reason not-linked (-1)

after few minutes, attached the debug logs, please let me know if are enough to understand the problem

Attachment 289691, "debug logs":
log.txt.tar.gz