caps in udpsrc should be at least "application/x-rtp" , certainly not the one which you are using. <div class="gmail_quote">On Fri, Apr 1, 2011 at 2:50 AM, Matias Hernandez Arellano <<a href="mailto:msdark@archlinux.cl">msdark@archlinux.cl</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Hi ... im trying to stream my webcam using OpenCV and gstreamer (with appsrc)... for this, first i test using the command line with this: gst-launch v4l2src ! ffmpegcolorspace ! theoraenc ! rtptheorapay ! udpsink host=localhost port=5000 sync=false -v Then i try to see the streaming using this command line: gst-launch udpsrc port=5000 caps="video/x-raw-yuv, format=(fourcc)I420, framerate=(fraction)30/1, width=(int)640, height=(int)480, interlaced=(boolean)false" ! rtptheoradepay ! theoradec ! ximagesink But i get an error: could not link udpsrc0 to rtptheoradepay0 and could not link udpsrc0 to rtptheoradepay0 then i try to use vlc to see what i get from webcam using rtp://@localhost:5000 but nothing happend ... what i'm do wrong??? I'm running Ubuntu 10.10 with gstreamer and plugins compiled from git repositorie... Thanks in advance!! Matías Hernandez Arellano Ingeniero de Software/Proyectos en VisionLabs S.A CDA Archlinux-CL <a href="http://www.msdark.archlinux.cl" target="_blank">www.msdark.archlinux.cl</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div> -- Regards, Sudarshan Bisht