Hi Zhenfeng Ren, Please refer to the attached log.txt. BTW, I hope you've compiled libxml as well while building the GStreamer packages. As far as I know, gst-inspect won't work without libxml and, in that case, you need to edit the gst-launch source file to manually load the plugins. Thanks, Gireesh <div class="gmail_quote">On Wed, Jan 7, 2009 at 11:15 AM, zhenfeng ren <<a href="mailto:1985renzf@gmail.com">1985renzf@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,Gireesh: <div class="Ih2E3d"> > Seems like your GST_PLUGIN_PATH is not correct. Please check if the > following libraries are available under your GST_PLUGIN_PATH (i.e. > /home/opt/gstreamer/lib/gstreamer-0.10) > libgstcoreelements.a > <a href="http://libgstcoreelements.la" target="_blank">libgstcoreelements.la</a> > libgstcoreelements.so </div>I check again ,and these libraries are under GST_PLUGIN_PATH . Thanks, Zhenfeng Ren </blockquote></div>