You can run multiple pipeline in a gstreamer application , in you app you need to create different pipeline and set them in playing state separately. I dont see any issue in doing that ? <div class="gmail_quote"> On Mon, May 30, 2011 at 9:31 PM, E-J van der Linden <<a href="mailto:EJvanderLinden@hetnet.nl">EJvanderLinden@hetnet.nl</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 try to have two pipelines in one gst-launch command. gst-launch -v alsasrc ! "audio/x-raw-int,channels=2,rate=44100,depth=32,height=32" ! audioconvert ! rtpL16pay ! udpsink host=localhost port=8000 \ udpsrc port=8000 ! "application/x-rtp,media=audio,clock-rate=44100,channels=2,payload=96" ! rtpL16depay ! alsasink sync=false The output is Setting pipeline to PAUSED ... /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: actual-buffer-time = 200000 /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0: actual-latency-time = 10000 /GstPipeline:pipeline0/GstAlsaSrc:alsasrc0.GstPad:src: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)44100, channels=(int)2, height=(int)32 Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstAudioSrcClock /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:src: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)44100, channels=(int)2, height=(int)32 /GstPipeline:pipeline0/GstCapsFilter:capsfilter0.GstPad:sink: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)44100, channels=(int)2, height=(int)32 /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:src: caps = audio/x-raw-int, endianness=(int)4321, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)44100, channels=(int)2 /GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:sink: caps = audio/x-raw-int, endianness=(int)1234, signed=(boolean)true, width=(int)32, depth=(int)32, rate=(int)44100, channels=(int)2, height=(int)32 /GstPipeline:pipeline0/GstRtpL16Pay:rtpl16pay0.GstPad:src: caps = application/x-rtp, media=(string)audio, clock-rate=(int)44100, encoding-name=(string)L16, encoding-params=(string)2, channels=(int)2, payload=(int)96, ssrc=(uint)407862357, clock-base=(uint)3043520952, seqnum-base=(uint)48790 /GstPipeline:pipeline0/GstRtpL16Pay:rtpl16pay0.GstPad:sink: caps = audio/x-raw-int, endianness=(int)4321, signed=(boolean)true, width=(int)16, depth=(int)16, rate=(int)44100, channels=(int)2 /GstPipeline:pipeline0/GstRtpL16Pay:rtpl16pay0: timestamp = 3043520952 /GstPipeline:pipeline0/GstRtpL16Pay:rtpl16pay0: seqnum = 48790 /GstPipeline:pipeline0/GstUDPSink:udpsink0.GstPad:sink: caps = application/x-rtp, media=(string)audio, clock-rate=(int)44100, encoding-name=(string)L16, encoding-params=(string)2, channels=(int)2, payload=(int)96, ssrc=(uint)407862357, clock-base=(uint)3043520952, seqnum-base=(uint)48790 I see that the second pipe doesn't run, there isn't sound !! When I run two gst-launch commands, there is sound. The thing is that I want to program the two pipelines in one program and if I can't get this to work with gst-launch I think I can't program it... Ernst-Jan _______________________________________________ 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> -- <a href="http://www.mediamagictechnologies.com">www.mediamagictechnologies.com</a> (Gstreamer, ffmpeg, Red5, Streaming) twitter handle: @gst_kaps <a href="http://www.linkedin.com/in/kapilagrawal">http://www.linkedin.com/in/kapilagrawal</a>