<div dir="ltr"> I myself find out where i was missing...thank you very much.. <div class="gmail_quote">On Tue, Aug 5, 2008 at 3:14 PM, Rahul Nikose <<a href="mailto:rahul.nikose@gmail.com">rahul.nikose@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div dir="ltr">Hi ,         I have wrote on demuxer for mp4 file. When I used it following pipeline   1. Pipeline for playing audio        gst-launch filesrc location=/home/rahul/djcrazyfro490601.mp4 ! mp4demuxer !          decodebin ! audioconvert ! audioresample ! autoaudiosink   2. Pipeline for playing video       gst-launch filesrc location=/home/rahul/djcrazyfro490601.mp4 ! mp4demuxer !       decodebin ! ffmpegcolorspace ! videoscale ! autovideosink      It work in both case successfully.  Now I want to connect both pipeline so that I am able to play both audio and  video simultaneously.       So construct pipeline like follows :  gst-launch filesrc location=/home/rahul/djcrazyfro490601.mp4 ! mp4demuxer name=demux  demux.audio_00 ! decodebin ! audioconvert ! audioresample ! autoaudiosink   demux.video_00 ! queue ! decodebin ! ffmpegcolorspace ! videoscale ! autovideosink        but I got error saying pushing failed because "not linked"      In implementation of demuxer I havan't write anything to support like name=demux  demux.audio_00  or  demux.video_00  I also look for same in "qtdemux" but I didn't find any help... Can you please help me and suggest me how to resolve this issue... Thank you very much . Have nice time.   </div> </blockquote></div> -- Thanks and warm Regards Rahul S. Nikose 09739949798 </div>