<div dir="ltr">Thank you all!<br><br>What is making a mux being a rtspclientsink? <br>How would I know that?<br><br>filesrc location=opus.opus ! opusenc ! matroskamux  ! rtspclientsink debug=true location=rtsp://<a href="http://127.0.0.1:8554/test">127.0.0.1:8554/test</a><br><br>WARNING: erroneous pipeline: could not link matroskamux0 to rtspclientsink0<br><br>Eric<br></div>