+* RTSP on_media_configure and appsrc: https://github.com/GStreamer/gst-rtsp-server/blob/master/examples/test-appsrc.c
+* Link two pipelines: http://gstreamer-devel.966125.n4.nabble.com/Two-pipelines-link-them-merge-them-easy-handling-td4686753.html
+
+a "relay" between cameras and rtsp, in rust:
+
+* https://github.com/thirtythreeforty/neolink