If I am not wrong valves drops buffers while blocking don't drop any data. That is the difference <div class="gmail_quote">On Tue, Jan 24, 2012 at 2:08 PM, Ralph <<a href="mailto:ralph.gucwa@racelogic.co.uk">ralph.gucwa@racelogic.co.uk</a>> wrote: <blockquote class="gmail_quote" style="margin:0pt 0pt 0pt 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">What about using valves instead of blocking the pads? Just theoretising, I've never done it, but I suspect it might be a simpler solution. -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/gst-pad-set-blocked-async-callback-called-twice-tp4323582p4323819.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/gst-pad-set-blocked-async-callback-called-twice-tp4323582p4323819.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. _______________________________________________ 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>