hi all,          Thanks halley, I tried blocking the source pad of the mpegtsdemux but it dint work. What ia happening is , when i set the state of the pipeline to READY , the mpegtsdemux removes its source pad which was linked to the sink of queue. So when i check for GST_PAD_IS_LINKED on the sink pad of the queue it return FALSE. So i directly link the sink of queue to the newly emitted source pad of the mpegtsdemux. I checked for the result of the gst_pad_link(srcpad, sinkpad); It is returning GST_PAD_LINK_OK. Why is the video getting freezed? regards, <div class="gmail_quote">2009/3/6 Zhao, Halley <<a href="mailto:halley.zhao@intel.com">halley.zhao@intel.com</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div link="blue" vlink="purple" lang="ZH-CN"> <div> Try to block the upstream src pad before you link/unlink.   <a href="http://www.sfr-fresh.com/unix/privat/gstreamer-0.10.22.tar.gz:a/gstreamer-0.10.22/docs/design/part-block.txt" target="_blank">http://www.sfr-fresh.com/unix/privat/gstreamer-0.10.22.tar.gz:a/gstreamer-0.10.22/docs/design/part-block.txt</a>     <div style="border-style: none none none solid; border-color: -moz-use-text-color -moz-use-text-color -moz-use-text-color blue; border-width: medium medium medium 1.5pt; padding: 0cm 0cm 0cm 4pt;"> <div> <div style="text-align: center;" align="center"> <hr align="center" size="2" width="100%"> </div> From: Sumanth V [mailto:<a href="mailto:sumanth.v@allaboutif.com" target="_blank">sumanth.v@allaboutif.com</a>] Sent: 2009年3月6日 3:37 To: Discussion of the development of GStreamer Subject: [gst-devel] channel changing dvbsrc plugin </div><div><div></div><div class="h5">   Hi All,              I am writing a application using a dvbsrc plugin to play the incoming TV channels. How do i change the channels with out stopping the application? Right now i am doing it by changing the es-pid property of the mpegtsdemux plugin, i am able to to change the channels, but as soon as i change the channel , the video is getting freezed, its not playing. but i can change the channles. As soon as i shift to next channel, the video is getting freezed.          For the first time when i start the application it plays which ever channel i have selected, but later when i try to change the channels , the video is getting freezed. The method i am using to change the channel is :-  * when i want to change a channel, i set the pipeline to READY state and tune to a channel which i want to play and the set the "es-pid" property of the     mpegtsdemux plugin to the pid of the channel which i want to play.  * Set the pipeline back to PLAYING state.  * When the mpegtsdemux plugin generates a new pad for the new channel , i unlink the previous linked queue pad to the mpegtsdemux and then link to the new pad.  the pipeline is  gst-launch dvbsrc diseqc-source=0 frequency=10990000 symbol-rate=27500 polarity="v" code-rate-hp=3/4 ! mpegtsdemux ! queue ! mpeg2dec ! ffmpegcolorspace ! xvimagesink  Where am i going wrong here? Why is the video of the new channel  getting freezed?? regards, Sumanth       </div></div></div> </div> </div> ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD <a href="http://p.sf.net/sfu/XcvMzF8H" target="_blank">http://p.sf.net/sfu/XcvMzF8H</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div>