Some notes about gstreamer

README.md

@@ -230,6 +230,26 @@ docker run \
 http://gstreamer-devel.966125.n4.nabble.com/Need-help-with-using-OPUS-over-RTP-td4661409.html
 
 ```
-gst-launch-1.0 pulsesrc ! audioconvert ! opusenc ! rtpopuspay ! udpsink host=127.0.0.1 port=5000
-gst-launch-1.0 udpsrc port=5000 ! rtpopusdepay ! opusdec ! pulsesink
+# some sources
+audiotestsrc
+pulsesrc
+
+# some sinks
+pulsesink
+
+# sender
+gst-launch-1.0 \
+  pulsesrc ! \
+  audioconvert ! \
+  opusenc audio-type=voice inband-fec=false frame-size=20 ! \
+  rtpopuspay ! \
+  udpsink host=127.0.0.1 port=5000
+
+# receiver
+gst-launch-1.0 \
+  udpsrc port=5000 caps="application/x-rtp" ! \
+  rtpjitterbuffer do-lost=true do-retransmission=false ! \
+  rtpopusdepay ! \
+  opusdec plc=true use-inband-fec=false ! \
+  pulsesink
 ```