I think you have to specify the multicast-iface property on udpsrc with the name of the network interface you want to use (e.g. eth0) -Tristan <div class="gmail_quote">2010/1/16 gather bzbz <<a href="mailto:gbzbz@yahoo.com">gbzbz@yahoo.com</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi, When trying to receive multicast streams with udpsrc, I got the following erros: 0:00:01.935880519 840 0x15080 DEBUG rtspsrc gstrtspsrc.c:2140:gst_rtspsrc_stream_configure_mcast:<src> creating UDP sources for multicast 0:00:01.965450482 840 0x15080 DEBUG udpsrc gstudpsrc.c:611:gst_udpsrc_update_uri:<udpsrc0> updated uri to udp://<a href="http://224.1.1.1:6002" target="_blank">224.1.1.1:6002</a> 0:00:01.968627778 840 0x15080 DEBUG udpsrc gstudpsrc.c:804:gst_udpsrc_start:<udpsrc0> allocating socket for <a href="http://224.1.1.1:6002" target="_blank">224.1.1.1:6002</a> 0:00:01.971835852 840 0x15080 DEBUG udpsrc gstudpsrc.c:821:gst_udpsrc_start:<udpsrc0> binding on port 6002 0:00:01.974090963 840 0x15080 DEBUG udpsrc gstudpsrc.c:868:gst_udpsrc_start:<udpsrc0> have udp buffer of 103424 bytes 0:00:01.976310037 840 0x15080 DEBUG udpsrc gstudpsrc.c:892:gst_udpsrc_start:<udpsrc0> joining multicast group 224.1.1.1 0:00:01.979197593 840 0x15080 WARN udpsrc gstudpsrc.c:947:gst_udpsrc_start:<udpsrc0> error: could add membership -1: No such device The multicast streams from the server to multicast group 224.1.1.1 works fine as I can use another pc running VLC to receive it without problem. Any idea on why gst complains? Any system setup requirements for gst udpsrc to work? Thanks a ton! ------------------------------------------------------------------------------ Throughout its 18-year history, RSA Conference consistently attracts the world's best and brightest in the field, creating opportunities for Conference attendees to learn about information security's most important issues through interactions with peers, luminaries and emerging and established companies. <a href="http://p.sf.net/sfu/rsaconf-dev2dev" target="_blank">http://p.sf.net/sfu/rsaconf-dev2dev</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div> -- Tristan Matthews email: <a href="mailto:tristan@sat.qc.ca">tristan@sat.qc.ca</a> web: <a href="http://tristanswork.blogspot.com">http://tristanswork.blogspot.com</a>