Not generating valid Transport headers for RTSP 2.0
The same of course also applies to the parsing in rtspsrc.
In RTSP 1.0 the Transport header uses source, destination, client_port, server_port. In RTSP 2.0 it uses combined dest_addr and src_addr.
Compare https://tools.ietf.org/html/rfc2326#page-58 and https://tools.ietf.org/html/rfc7826#section-20.2.3
CC @thiblahute