Sorry for the delayed response. gst-inspect ffenc_g726 shows that the input wants a rate of 4000 or 96000. It looks to me like you have set 8000 in your caps. <div class="gmail_quote">On Wed, Jan 30, 2013 at 3:00 AM, eswar <<a href="mailto:eswarg@vrindatech.com" target="_blank">eswarg@vrindatech.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Crisler, The Below pipeline works fine. gst-launch -v alsasrc ! audio/x-raw-int,rate=8000,channels=1,depth=16,width=16, endianness=1234,signed=true ! ffenc_g726 bitrate=32000 ! rtpg726pay ! udpsink host=192.168.10.20 port=5544 We tried the following pipeline for mpegts gst-launch --gst-debug=2 -v alsasrc ! audio/x-raw-int,rate=8000,channels=1,depth=16,width=16,endianness=1234,signed=true ! ffenc_g726 bitrate=32000 ! mpegtsmux ! udpsink host=192.168.20.10 port=5544 We are getting following error. (gst-launch-0.10:1013): GStreamer-CRITICAL **: gst_pad_set_caps: assertion `caps == NULL || gst_caps_is_fixed (caps)' failed The attached files contains gst-inspect for rtpg726pay,mpegtsmux,ffenc_g726 and debug output for above command. log.txt --> gst-inspect for rtpg726pay,mpegtsmux,ffenc_g726 debug.txt--> debug info for the above command. log.txt <<a href="http://gstreamer-devel.966125.n4.nabble.com/file/n4658228/log.txt" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/file/n4658228/log.txt</a>> debug.txt <<a href="http://gstreamer-devel.966125.n4.nabble.com/file/n4658228/debug.txt" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/file/n4658228/debug.txt</a>> Thank You Eswar -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/G-726-streaming-using-MPEG-TS-Muxer-tp4658210p4658228.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/G-726-streaming-using-MPEG-TS-Muxer-tp4658210p4658228.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. _______________________________________________ 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>