>> 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 } > > The host part of a URI to udpsrc is only used for multicast sessions. > In the unicast case, you should just use udpsrc port=4400. > > Equivalently, if you want to use the URI form, specify the 'any' > address like udp://<a href="http://0.0.0.0:4400">0.0.0.0:4400</a> > > Mike Hello, Mike. Thanks for your reply. But there is something I can't understand. Yes, I'm trying to use unicast with udp. I want to run the server and client in different machines (say, one with ip 192.168.0.1, the other 192.168.0.10). how can I communicate between two machines if I can't specify ip address and only with port. If I use 0.0.0.0, that won't be an unicast. Yeah? Can you help. Or anybody kown how to do that? Thanks very much.