<div dir="ltr">You probably need to put them in separate threads. You can do that with queues or by explicitly putting them into threads. <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-threads.html">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-threads.html</a> </div><div class="gmail_extra"> <div class="gmail_quote">On Mon, May 6, 2013 at 3:50 PM, johnwesting <<a href="mailto:john.blank.westing@gmail.com" target="_blank">john.blank.westing@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I have a pipeline with multiple sources and my pipeline does caps negotiation in serial for each source instead of in parallel like I would expect, i.e. the GstBaseTransform::Start() method of the second source is not called until after the first source has negotiated its capabilities. I've been trying to find a solution for most of the day but can't find anything. I'm using gst-launch and the pipeline examples I am finding online aren't helping me. My pipeline looks something like this: gst-launch interleave name=i ! alsasink \ myfakesrc ! myfakedec ! queue ! i. \ myfakesrc ! myfakedec ! queue ! i. The second instance of myfakesrc does not get started until after the caps are negotiated for the first myfakessrc element. I want the 2 sources to run completely independent of each other, as if they are different processes, but joined at the interleave element. I tried surrounding the last 2 lines with {} brackets, e.g. { myfakesrc ... i. } \, but it still didn't work and I got the GStreamer warning: "Error during parsing: syntax error, unexpected $undefined". I also tried using [] brackets but got the same GStreamer warning. Please help. Thanks, John -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Multiple-Source-Pipeline-Hangs-tp4659808.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Multiple-Source-Pipeline-Hangs-tp4659808.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> </div>