Hi, mmmhhh, I've the suspect that in your case sending machine != receivning machine. Maybe you've an old version of x264enc in the first one. It appears, in fact, that the sending part is preparing the sprop-paramenter-set (aka codec data) for being transmitted outband. You can try to either add the property: <pre>codec_data=(buffer)014d4015ffe10017674d4015eca0a0fd8088000003000bb9aca00078b16cb001000468ebecb2</pre>in your receiver udpsrc caps. Alternatively (but less likely to succeed) you can set the following property in rtph264pay to send in-band sps and pps: config-interval=1 (should send in-band sps and pps). If it still does not work, please attach somewher the log you get with GST_DEBUG=3 Regards <div class="gmail_quote">On Wed, Nov 10, 2010 at 12:03 PM, 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;"> Marco Ballesio, Very sadly, I use your modfied sample still the same error. I think the syntax is no problem, my os is fedora13 install on vmware workstation. I have no idea. <div><div></div><div class="h5"> Marco Ballesio wrote: > > Hi, > > On Wed, Nov 10, 2010 at 11:30 AM, guodecn <<a href="mailto:guo.dehua@zxelec.com">guo.dehua@zxelec.com</a>> wrote: > >> >> Hi,Marco Ballesio, >> Thanks for your reply very much. >> >> >>However, the issue was the place you've set the "port" property. >> what's your mean? Don't udpsrc need the port property? if don't udpsrc >> have >> no port property, we can't receive the data. >> > > sorry, I didn't notice the "caps=" before the caps ;) > > >> >> I have modify the pipeline as below: >> >> server: >> gst-launch-0.10 -v videotestsrc ! x264enc ! rtph264pay ! udpsink >> host=127.0.0.1 port=40000 >> >> client: >> gst-launch-0.10 -v udpsrc port=40000 caps= >> >> "application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264,payload=(int)96" >> ! rtph264depay ! ffdec_h264 ! xvimagesink >> >> > These pipelines are working pretty well, both with the standard ubuntu > 10.4 > and all the packages aligned with the respective upstream heads. I suggest > you to check your syntax and copy/paste efficiency ;) > > Regards > > >> >> But the same error is still exist. Can you modify my pipeline correct, >> and >> show me. >> >> Thanks. >> -- >> View this message in context: >> <a href="http://gstreamer-devel.966125.n4.nabble.com/rtp-transmit-occur-not-negotiated-4-error-tp3035468p3035742.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/rtp-transmit-occur-not-negotiated-4-error-tp3035468p3035742.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> >> > > ------------------------------------------------------------------------------ > 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> > > </div></div>-- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/rtp-transmit-occur-not-negotiated-4-error-tp3035468p3035787.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/rtp-transmit-occur-not-negotiated-4-error-tp3035468p3035787.html</a> <div><div></div><div class="h5">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> </div></div></blockquote></div>