Thank you all! What is making a mux being a rtspclientsink? How would I know that? filesrc location=opus.opus ! opusenc ! matroskamux ! rtspclientsink debug=true location=rtsp://127.0.0.1:8554/testble to connect to a Eric -- Sent from: http://gstreamer-devel.966125.n4.nabble.com/