Of course you can do it at runtime. The gstreamer manual explains how to do it. That document should be read first before developing gst application. It's html version: <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/index.html">gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/index.html</a> Qi Wenmin <div class="gmail_quote"><div dir="ltr">symeon.mattes <<a href="mailto:symeon.mattes@gmail.com">symeon.mattes@gmail.com</a>>于2015年10月1日周四 17:03写道： </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Is it possible to do it dynamically? After I have created the pipeline to mix it with a wave signal? -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Sending-DTMF-signal-tp4673882p4673895.html" rel="noreferrer" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Sending-DTMF-signal-tp4673882p4673895.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" rel="noreferrer" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div>