First question - do you know that the input file is valid? I ask because it seems to be one that you provided. Can you play it with any other programs (VLC, mplayer)? Second question - how many frames (about) does it successfully play? Only 1? Third - have you tried cranking up the logging? export GST_DEBUG=qtdemux:4,ffdec_h264:3,mpegaudioparse:3 Since you have queues in both branches, if one gets stuck it shouldn't effect the other. I don't think that the h264parse is really needed, though it shouldn't hurt either. <div class="gmail_quote">On Mon, Feb 18, 2013 at 10:05 AM, Gary Thomas <<a href="mailto:gary@mlbassoc.com" target="_blank">gary@mlbassoc.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> I'm trying to write a pipeline which is equivalent to 'playbin2' to display an MP4 file (H.264+MP3) on my X based display. I'm doing this to provide finer control over the result, e.g. choice of H.264 decoder, etc. I tried this pipeline: gst-launch -v filesrc location=/dcim/Camera/2013-02-18_12-35-40.mp4 ! qtdemux name=demux \ demux. ! queue ! h264parse ! ffdec_h264 ! ffmpegcolorspace ! autovideosink \ demux. ! queue ! mpegaudioparse ! ffdec_mp3 ! audioconvert ! pulsesink Which starts out happy - it brings up a window with the image, but then it just gets stuck. There is no indication or error why. I then tried the [arguably] simpler pipeline and it also gets stuck: gst-launch -v filesrc location=/dcim/Camera/2013-02-18_12-35-40.mp4 ! qtdemux name=demux \ demux. ! queue ! h264parse ! filesink location=/tmp/junk.h264 \ demux. ! queue ! mpegaudioparse ! filesink location=/tmp/junk.wav Any ideas why this is happening? Where should I look? Thanks -- ------------------------------------------------------------ Gary Thomas | Consulting for the MLB Associates | Embedded world ------------------------------------------------------------ _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org" target="_blank">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>