try to put async=false on xvimagesink or on the pulsesink. I don't remember it on details...but when you have to sinks on the same pipe one keeps waiting for the other to be ready...something like that...so you get blocked, if one of the sinks are set with async=false this will not happen ...at least with me it worked :-) best regards, Katcipis <div class="gmail_quote">On Wed, Jul 21, 2010 at 12:46 PM, wl2776 <<a href="mailto:wl2776@gmail.com">wl2776@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> I have the pipeline: filesrc ! typefind ! mpegpsdemux name=demux multiqueue max-size-bytes=2097152 name=mq demux.audio_c0 ! mq.sink0 mq.src0 ! mp3parse ! flump3dec ! input-selector ! tee ! audioconvert ! audioresample ! pulsesink demux.video_e0 ! mq.sink1 mq.src1 ! mpegvideoparse ! mpeg2dec ! input-selector ! queue max-size-buffers=3 max-size-bytes=0 max-size-time=0 ! ffmpegcolorspace ! videoscale ! xvimagesink Here is the dot file: <a href="http://gstreamer-devel.966125.n4.nabble.com/file/n2297314/player.dot" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/file/n2297314/player.dot</a> player.dot (30kb), and produced PNG: <a href="http://gstreamer-devel.966125.n4.nabble.com/file/n2297314/player.png" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/file/n2297314/player.png</a> player.png (850kb) Looks like there is no negotiation between multiqueue and mpegvideoparse. Why an it be? I tried using seek example with this pipeline ($GST_PLUGINS_BASE/test/examples/seek/seek.c) It begins playing only after seek command. -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Why-does-my-pipeline-block-on-preroll-tp2297314p2297314.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Why-does-my-pipeline-block-on-preroll-tp2297314p2297314.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit <a href="http://sprint.com/first" target="_blank">sprint.com/first</a> -- <a href="http://p.sf.net/sfu/sprint-com-first" target="_blank">http://p.sf.net/sfu/sprint-com-first</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> -- <a href="http://www.getgnulinux.org/windows">http://www.getgnulinux.org/windows</a>