Backport of "gst-rtsp-server: Fix pushing backlog to client" into 1.20
Backport of !2936 (merged) "gst-rtsp-server: Fix pushing backlog to client".
Commits:
- 657cc3e6 gst-rtsp-server: Fix pushing backlog to client
Backport of !2936 (merged) "gst-rtsp-server: Fix pushing backlog to client".
Commits: