Hi, <div class="gmail_quote">On Wed, Nov 10, 2010 at 5:26 AM, guodecn <<a href="mailto:guo.dehua@zxelec.com">guo.dehua@zxelec.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> I have some troubles of rtp transmit of gstreamer. I test the rtp transmit, server and client are all in local host, so my example as below: server: gst-launch-0.10 -v videotestsrc ! x264enc ! rtph264pay ! udpsink host=127.0.0.1 port=40000 sync=false </blockquote><div> you don't need to set sync to false here. Btw it shouldn't harm that much. </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> client: gst-launch-0.10 -v udpsrc caps=" application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264,payload=(int)96,ssrc=(uint)237526004,clock-base=(uint)1584170994,seqnum-base=(uint)42626" port=40000 ! rtph264depay ! decodebin ! xvimagesink </blockquote><div> you must not specify ssrc, clock-base and seqnum-base in your caps. Unless you're playing back something captured with tcpdump, they're likely to change for each streaming session. It's easy to see this through wireshark. </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> the client caps is copied from the server's udpsrc caps. But still occur an error, error message as below: ERROR: from element /GstPipeline:pipeline0/GstUDPSrc:udpsrc0: Internal data flow error. Additional debug info: gstbasesrc.c(2550): gst_base_src_loop (): /GstPipeline:pipeline0/GstUDPSrc:udpsrc0: streaming task paused, reason not-negotiated (-4) </blockquote><div> it's reasonable, as the receiving pipeline is expecting EXACTLY the same SSRC, clock-base and seqnum-base. Maybe you can set the verbosity of your pipeline to something like GST_DEBUG=3 to confirm. Regards </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> Execution ended after 623154883 ns. Setting pipeline to PAUSED ... Setting pipeline to READY ... I have test the rtp example in the tree of gst-plugin-good/tests/example/rtp, occur the same error. I also have read the document: <a href="http://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/gst/rtp/README#n251" target="_blank">http://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/gst/rtp/README#n251</a>, and follow it , still occur the same error. Who can help me? Thanks very much. -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/rtp-transmit-occur-not-negotiated-4-error-tp3035468p3035468.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/rtp-transmit-occur-not-negotiated-4-error-tp3035468p3035468.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. ------------------------------------------------------------------------------ The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book "Blueprint to a Billion" shares his insights and actions to help propel your business during the next growth cycle. Listen Now! <a href="http://p.sf.net/sfu/SAP-dev2dev" target="_blank">http://p.sf.net/sfu/SAP-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>