You may tell if the suggested command above with uridecodebin works with the 2 local RTSP servers.
If yes and it just fails when using remote IP camera and/or remote dummy RTSP server, you may try both:
- increasing latency to 1000 ms
- using TCP transport: change uri into
rtspt://<your_uri>
, or with rtspsrc you may try propertyprotocols=tcp
.