Hi, another late reply ;) . See my comments below. <div class="gmail_quote">On Fri, Nov 12, 2010 at 10:18 AM, Thomas Roos <<a href="mailto:thomas@roosesweb.de">thomas@roosesweb.de</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">hello all, I want to have time synchronised audio playback (multi room feature) on multiple receivers (differerent ip devices) my sender pipeline alsasrc ! pcmapay ! tee ! rtpbin ! udpsink1(rtp) ! ! udpsink1(rtcp) ! ! udpsrc1(rtcp) ! rtpbin ! udpsink2(rtp) ! udpsink2(rtcp) ! udpsrc2(rtcp) </blockquote><div> Likely you're not using this exact command, btw I guess both the rtpbin elements are connected to the tee. </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> receiver pipeline 1 udpsrc (rtp) ! rtpbin ! pcmadepay ! alsasink udpsrc (rtcp) ! udpsink (rtcp) ! receiver pipeline 2 udpsrc (rtp) ! rtpbin ! pcmadepay ! alsasink udpsrc (rtcp) ! udpsink (rtcp) ! so I have tried (in order to synchronise the streams) to set the ts-offset in the udpsink1(rtp) to a fixed maximum network delay (i use WANem for testing) </blockquote><div> as the timestamps are representing data generation time, I don't get how modifying the ts-offset in the source may affect synchronisation on multiple receivers. </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">and enabled "ntp-sync" and "use-pipeline-clock" for the sender and receiver rtpbin Pipeline is working but network delay still exsists. Shouldn't the ntp-sync and use-pipeline clock parameter synchronize the sender and receiver clocks? </blockquote><div> A few questions. on a tcpdump, do you see the RTCP sender reports travelling over the network? Setting GST_DEBUG=gstrtpbin:5, do you see messages like "NTP time..." or "NTP diff..." on the clients? If you do, are the drift compensations correct? As a further point, you need to be sure that you're using the same values of "n" for the pads you're connecting the udpsinks to in the sending pipeline (e.g. send_rtcp_src_0 and send_rtcp_src_0). I hope this will help. Regards </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Together with the ts-offset it is played out delayed but synchronised? The ts-offset sets the playout time? Can anybody help me? Ideas? Examples? I can only find examples for lipsync audio/video streams, and that only for one receiver. According to that post: <a href="http://sourceforge.net/mailarchive/message.php?msg_id=20100827160618.15BA0EE8CE%40bugzilla-web.gnome.org" target="_blank">http://sourceforge.net/mailarchive/message.php?msg_id=20100827160618.15BA0EE8CE%40bugzilla-web.gnome.org</a> it should work in the actual git version am I wrong? cheers Thomas P.S: i use the git version from 11.11.2010 of gstreamer gst-plugins-base gst-plugins-good ------------------------------------------------------------------------------ Centralized Desktop Delivery: Dell and VMware Reference Architecture Simplifying enterprise desktop deployment and management using Dell EqualLogic storage and VMware View: A highly scalable, end-to-end client virtualization framework. Read more! <a href="http://p.sf.net/sfu/dell-eql-dev2dev" target="_blank">http://p.sf.net/sfu/dell-eql-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>