rtspsrc: Also consider "Method Not Valid In This State" error in broken...
requested to merge slomo/gstreamer:rtspsrc-broken-control-url-workaround-method-not-valid-in-this-state into main
rtspsrc: Also consider "Method Not Valid In This State" error in broken control URL handling workaround
Some servers send a 455 error instead of any reasonable error when using a correctly constructed control URL.