Are you sure the element vid->pipeline is created properly , did you crosscheck it ? <div class="gmail_quote">2010/4/1 Sebastián <<a href="mailto:sebarocker@gmail.com">sebarocker@gmail.com</a>> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hi, I´m having problems trying to change the pipeline state. Please find below a snippet of the code: gst_element_set_state (vid->pipeline, GST_STATE_READY); and this is the error message I am getting: (<unknown>:10599): GStreamer-CRITICAL **: gst_element_set_state: assertion `GST_IS_ELEMENT (element)' failed Can someone shed some light on what could be causing this? Thanks! Sebastián ------------------------------------------------------------------------------ Download Intel&#174; Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. <a href="http://p.sf.net/sfu/intel-sw-dev" target="_blank">http://p.sf.net/sfu/intel-sw-dev</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> -- Regards, Sudarshan Bisht