[gst-devel] udpsrc fails to join multicast group

[gather bzbz]

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://224.1.1.1:6002
0:00:01.968627778   840    0x15080 DEBUG               udpsrc gstudpsrc.c:804:gst_udpsrc_start:<udpsrc0> allocating socket for 224.1.1.1:6002
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!