Hi, <div style="margin-left: 40px;">I hv installed the gstreamer setup ,gst-plugins-base setup and <a href="http://perso.orange.es/moutte983/gstreamer/cvs/gst-plugins-bad-cvs-29122006.setup.zip">gst-plugins-bad-cvs-29122006.setup.zip but i still can't play the ogg. </a> What i can do? </div> D:\...debug>set GST_PLUGIN_PATH=D:\kevin\fyp\testing\test ing\debug\plugins D:\..\debug>gst-launch-0.10.exe playbin uri=<a href="file://d:/video.ogg">file://d:/video.ogg</a> Setting pipeline to PAUSED ... Pipeline is PREROLLING ... ** (gst-launch-0.10.exe:1016): WARNING **: could not create autoaudiosink element (gst-launch-0.10.exe:1016): GStreamer-CRITICAL **: gst_object_ref: assertion `GST_IS_OBJECT (object)' failed (gst-launch-0.10.exe:1016): GStreamer-CRITICAL **: gst_object_ref: assertion `GST_IS_OBJECT (object)' failed (gst-launch-0.10.exe:1016): GStreamer-CRITICAL **: gst_bin_add: assertion `GST_IS_ELEMENT (element)' failed (gst-launch-0.10.exe:1016): GStreamer-CRITICAL **: gst_element_link_pads: assertion `GST_IS_ELEMENT (dest)' failed Pipeline is PREROLLED ... Setting pipeline to PLAYING ... New clock: GstSystemClock <div>On 1/12/07, Kevin Wong <<a href="mailto:simon.simonwong@gmail.com">simon.simonwong@gmail.com</a>> wrote:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> HI, <div style="margin-left: 40px;">I want to test my application. However, i hv use any command in command line interpeter that only show that ** (gst-launch-0.10:984): WARNING **: error while parsing ERROR: pipeline could not be constructed: no element "playbin" Can anyone teach me how to use? Thank for your help </div> </blockquote></div>