You should wait for the no-more-pads signal see : <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#GstElement-no-more-pads">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#GstElement-no-more-pads</a> Before setting your pipeline to null.. Not quite sure if all the demuxers support it tought... Antoine <div class="gmail_quote">On Mon, Feb 9, 2009 at 12:47 PM, W. Michael Petullo <<a href="mailto:mike@flyn.org">mike@flyn.org</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">What is the correct way to use decodebin in a synchronous, sequential manner to review the stream types in many files? I have an application that needs to classify files as having an audio or video component (or both). Right now, I set up a decodebin pipeline, register a new-decoded-pad callback and set the pipeline's state to paused. The new-decoded-pad callback classifies each component. Soon after, the pipeline's state is set to NULL and the pipeline is free'd. What I am finding is that only the first pad is set up between the paused and NULL states. For example, if a stream has both audio and video components, then the audio pad is set up. What I can do is enter a glib main loop between the paused and NULL states. If I let this run for 1/10th of a second, then both pads will be setup and my callback will be called twice. Of course, this depends on the timing of events which may not always fit into 1/10th of a second. This technique does not seem very elegant. Is there a better way? Mike ------------------------------------------------------------------------------ Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM) software. With Adobe AIR, Ajax developers can use existing skills and code to build responsive, highly engaging applications that combine the power of local resources and data with the reach of the web. Download the Adobe AIR SDK and Ajax docs to start building applications today-<a href="http://p.sf.net/sfu/adobe-com" target="_blank">http://p.sf.net/sfu/adobe-com</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>