I could solve the issue. I did not add the queue element in my application program between the qtdemux and payloader element. <br>Once I added the queue element the server is able to stream properly.<br><br><br><br><div class="gmail_quote"> On Wed, Mar 25, 2009 at 2:13 PM, Jyoti D <span dir="ltr"><<a href="mailto:jyoti.d@allaboutif.com">jyoti.d@allaboutif.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div><div></div><div class="h5"><div class="gmail_quote">Hi all,<br><br>I am writing an application for UDP multicast server. I use the below<br>pipelines for server & client.<br><br>SERVER:<br>gst-launch filesrc location=~/Desktop/h264-aac/alien.mp4 ! qtdemux name=d \<br> d. ! queue ! rtph264pay ! udpsink port=1234 host=224.0.0.1 \<br> d. ! queue ! rtpmp4apay ! udpsink port=1233 host=224.0.0.1<br><br>CLIENT:<br>gst-launch udpsrc uri=udp://<a href="http://224.0.0.1:1234" target="_blank">224.0.0.1:1234</a> caps="application/x-rtp, media=(string)video, encoding-name=(string)H264, payload=(int)96" ! queue ! rtph264depay ! ffdec_h264 ! ffmpegcolorspace ! xvimagesink\<br> udpsrc uri=udp://<a href="http://224.0.0.1:1233" target="_blank">224.0.0.1:1233</a> caps="application/x-rtp, media=(string)audio, clock-rate=(int)44100, encoding-name=(string)MP4A-LATM, payload=(int)96" ! queue ! rtpmp4adepay ! faad ! audioconvert ! alsasink <br> <br>The pipeline works fine. But when I am writing an application for the above pipeline<br>the pipeline doesn't change its state to "PLAYING". I state change on the pipeline<br>is "GST_STATE_CHANGE_ASYNC".<br> <br>The pipeline never changes its state to "PLAYING".<br><br>But when if I change my application to send either video or audio packets alone the<br>application works fine with proper state changes.<br><br>I will be thankful for any help.<br> <br><br><br> </div><br> </div></div></blockquote></div><br>