Thank you very much for your reply, Lin. I change the order of "host=" and "port=" as you said, but the same error occurs. The server side seems working normally as before, after I start the server: gst-launch filesrc location=new0.mpg ! mpegdemux mpegdemux0.video_00 ! { queue ! udpsink host=127.0.0.1 port=4400 } \ mpegdemux0.audio_00 ! { queue ! udpsink host=127.0.0.1 port=4401 } Setting pipeline to PAUSED ... Pipeline is PREROLLING ... Pipeline is PREROLLED ... Setting pipeline to PLAYING ... New clock: GstSystemClock Then the client: gst-launch udpsrc uri=udp://<a href="http://127.0.0.1:4400">127.0.0.1:4400</a> ! { queue ! mpeg2dec ! xvimagesink } \ udpsrc uri=udp://<a href="http://127.0.0.1:4401">127.0.0.1:4401</a> ! { queue ! decodebin ! audioconvert ! audioresample ! autoaudiosink } Setting pipeline to PAUSED ... JACK tmpdir identified as [/dev/shm] ERROR: Pipeline doesn't want to pause. Error: from element:  /pipeline0/udpsrc0Ŗēcan't get the resource specified. Debug information: gstudpsrc.c(825): gst_udpsrc_start (): /pipeline0/udpsrc0: could add membership -1: invalid parameter (22) Setting pipeline to NULL ... FREEING pipeline ... If I don't use "uri=upd://..." , just "port=" on the client side, everything goes well. Where am I wrong, can anybody help me ? Thanks very much. ===================================================== Lin wrote: > > Hi shirie, > > Just tested your pipeline on my machine. It crashes in the latter 3 cases. > > However, if we specify the host first and then the port in the udpsink > properties of server side, the pipeline works just fine. That is, to write > "host=...." first and  then "port=...." > > IMHO, there seems to be a default order in the modification of udpsink's > properties. I don't know if this is true, but you can refer to the following > source: $PLUGIN_GOOD/gst/udp/gstudpsink.c, in function > gst_udpsink_set_property(). The code is modifying host iff parameter prop_id > =1, while prop_id is susceptible to be the order of the modification > expression. > I'm using the latest release of plugins-good. Don't know if it is the same > case for more stable versions. > > I'll be very happy to see anyone to prove or disprove my guess. > > > Regards, > Lin ================================================================== shirie wrote: > > Hi, all. I am a newbie to gstreamer.  I am now trying build a simple > pipeline to transmit video with udp between two machines. > Here are what I have done now. > > server: > gst-launch filesrc location=new0.mpg ! mpegdemux mpegdemux0.video_00 ! { > queue ! udpsink port=4400 } \ > mpegdemux0.audio_00 ! { queue ! udpsink port=4401 } > > client: > gst-launch udpsrc port=4400 ! { queue ! mpeg2dec ! xvimagesink } \ > udpsrc port=4401 ! { queue ! decodebin ! audioconvert ! audioresample ! > autoaudiosink } > > I test them in one machine. They work well. > > But when I tried to specify the ip address as: > > server: > gst-launch filesrc location=new0.mpg ! mpegdemux mpegdemux0.video_00 ! { > queue ! udpsink port=4400 host=192.168.0.1} \ > mpegdemux0.audio_00 ! { queue ! udpsink port=4401 host=192.168.0.1 } > client: > gst-launch udpsrc uri=udp://<a href="http://192.168.0.1:4400" target="_blank">192.168.0.1:4400</a> ! { queue ! mpeg2dec ! > xvimagesink } \ > udpsrc uri=udp://<a href="http://192.168.0.1:4401" target="_blank">192.168.0.1:4401</a> ! { queue ! decodebin ! audioconvert ! > audioresample ! autoaudiosink } > > Error occurs in the client. > error: from element /pipeline0/udpsrc0?can't get the resource specified. > (I > translate the message from my local language) > > gstudpsrc.c(825): gst_udpsrc_start (): /pipeline0/udpsrc0: > could add membership -1: invalid parameter (22) > > > Even cannot work with using 127.0.0.1 in one machine. > server: > gst-launch filesrc location=new0.mpg ! mpegdemux mpegdemux0.video_00 ! { > queue ! udpsink port=4400 host=127.0.0.1 } \ > mpegdemux0.audio_00 ! { queue ! udpsink port=4401 host=127.0.0.1 } > client: > gst-launch udpsrc uri=udp://<a href="http://127.0.0.1" target="_blank">127.0.0.1</a> :4400 ! { queue ! mpeg2dec ! > xvimagesink } \ > udpsrc uri=udp://<a href="http://127.0.0.1" target="_blank">127.0.0.1</a> :4401 ! { queue ! decodebin ! audioconvert ! > audioresample ! autoaudiosink } > > But using "localhost" works, > gst-launch filesrc location=new0.mpg ! mpegdemux mpegdemux0.video_00 ! { > queue ! udpsink port=4400 host=localhost } \ > mpegdemux0.audio_00 ! { queue ! udpsink port=4401 host=localhost } > client: > gst-launch udpsrc uri=udp://localhost :4400 ! { queue ! mpeg2dec ! > xvimagesink } \ > udpsrc uri=udp://localhost :4401 ! { queue ! decodebin ! audioconvert ! > audioresample ! autoaudiosink } > > I'm confused. Can anybody help me? > Thanks very much. > > ------------------------------------------------------------------------------ > > _______________________________________________ > gstreamer-devel mailing list > <a href="mailto:gstreamer-devel@lists.sourceforge.net" target="_blank">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> > > -- View this message in context: <a href="http://www.nabble.com/help%3A-udpsrc-with-ip-address.-tp22735354p22736689.html" target="_blank">http://www.nabble.com/help%3A-udpsrc-with-ip-address.-tp22735354p22736689.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com.