do you have to link the elements a certain way? can i just take each of the elements and connect them accordingly or no? I have converted command line to code before but this one I wondered if it works differently. gst-launch-1.0 -e concat name=c ! h264parse ! mp4mux name=mux ! filesink location=testing.mp4 concat name=c2 ! aacparse ! mux.audio_1 filesrc location=[1] ! qtdemux name=dem1 ! queue ! c. dem1.audio_0 ! queue ! c2. filesrc location=[2] ! qtdemux name=dem2 ! queue ! c. dem2.audio_0 ! queue ! c2. filesrc location=[3] ! qtdemux name=dem3 ! queue ! c. dem3.audio_0 ! queue ! c2. filesrc location=[4] ! qtdemux name=dem4 ! queue ! c. dem4.audio_0 ! queue ! c2. <div class="signature" style="margin-top:1em;color:#666666;font-size:11px;"> ------------------------------ Gstreamer 1.14.4 ------------------------------ Windows </div> <hr align="left" width="300" /> Sent from the <a href="http://gstreamer-devel.966125.n4.nabble.com/">GStreamer-devel mailing list archive</a> at Nabble.com.