<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Hello,</div><div class=""><br class=""></div><div class="">With the GStreamer RTSP server, two exaples are available to test multicast traffic.</div><div class="">I can not get them to work and I need some help.</div><div class=""><br class=""></div><div class="">On the server-side:</div><div class="">./test-multicast</div><div class="">stream ready at <a href="rtsp://127.0.0.1:8554/test" class="">rtsp://127.0.0.1:8554/test</a></div><div class=""><br class=""></div><div class="">On the client-side (same machine):</div><div class=""><br class=""></div><div class="">gst-launch-1.0 -v playbin uri=<a href="rtsp://10.0.2.15:8554/test" class="">rtsp://10.0.2.15:8554/test</a></div><div class="">......</div><div class="">......</div><div class=""><b class="">Could not receive any UDP packets for 5,0000 seconds</b>, maybe your firewall is blocking it. Retrying using a TCP connection.</div><div class="">ERROR: from element /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstRTSPSrc:source: Could not read from resource.</div><div class="">Additional debug info:</div><div class="">gstrtspsrc.c(6347): gst_rtspsrc_setup_streams (): /GstPlayBin:playbin0/GstURIDecodeBin:uridecodebin0/GstRTSPSrc:source:</div><div class=""><b class="">Could not connect to server, no protocols left</b></div><div class=""><br class=""></div><div class="">I use Ubuntu 16.04.1. </div><div class="">Multicast traffic works on my computer.</div><div class="">Tested with a "hello world" multicast socket c-program, so no problems with routes or so.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">With Wireshark I see a correct reply with a RTP/SDP description to use multicast address 224.3.0.0</div><div class="">However I see no RTP packets from the server.</div><div class=""><br class=""></div><div class="">This is the log from the REPLY of the server on the DESCRIBE request of the client:</div><div class=""><br class=""></div><div class="">Internet Protocol Version 4, Src: 10.0.2.15, Dst: 10.0.2.15</div><div class="">Transmission Control Protocol, Src Port: 8554 (8554), Dst Port: 38752 (38752), Seq: 184, Ack: 595, Len: 448</div><div class="">Real Time Streaming Protocol</div><div class=""> Response: RTSP/1.0 200 OK\r\n</div><div class=""> Status: 200</div><div class=""> CSeq: 2\r\n</div><div class=""> Content-type: application/sdp</div><div class=""> Content-Base: <a href="rtsp://10.0.2.15:8554/test/\r\n" class="">rtsp://10.0.2.15:8554/test/\r\n</a></div><div class=""> Server: GStreamer RTSP server\r\n</div><div class=""> Date: Thu, 12 Jan 2017 17:38:07 GMT\r\n</div><div class=""> Content-length: 257</div><div class=""> \r\n</div><div class=""> Session Description Protocol</div><div class=""> Session Description Protocol Version (v): 0</div><div class=""> Owner/Creator, Session Id (o): - 2074017758225444218 1 IN IP4 10.0.2.15</div><div class=""> Session Name (s): Session streamed with GStreamer</div><div class=""> Session Information (i): rtsp-server</div><div class=""> Time Description, active time (t): 0 0</div><div class=""> Session Attribute (a): tool:GStreamer</div><div class=""> Session Attribute (a): type:<b class="">broadcast</b></div><div class=""> Session Attribute (a): control:*</div><div class=""> Session Attribute (a): range:npt=0-</div><div class=""> Media Description, name and address (m): audio 0 RTP/AVP 8</div><div class=""> Connection Information (c): IN IP4 <b class="">224.3.0.0/16</b></div><div class=""> Media Attribute (a): rtpmap:8 PCMA/8000</div><div class=""> Media Attribute (a): control:stream=0</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">When I use the example test_multicast2, the pipeline is established, but the RTP is send as unicast, not multicast.</div><div class="">In the RTP/SDP information I see type broadcast but no multicast address as Connection Information.</div><div class=""><div class=""> Session Attribute (a): type:<b class="">broadcast</b></div></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Connection Information (c): IN <b class="">IP4 0.0.0.0</b></div><div class=""><b class=""><br class=""></b></div><div class=""><div class="">What do I do wrong?</div></div><div class=""><br class=""></div><div class="">regards,</div><div class=""><br class=""></div><div class="">Ernst-Jan</div></body></html>