In your first pipeline it should be udpsink , not udpsrc. Another thing is that you are not properly setting up rtp packets of encoded data. So I think your pipelines should look like this; gst-launch videotestsrc ! videoscale ! videorate ! video/x-raw-yuv,width=640,height=480,framerate=25/1 ! ffmpegcolorspace ! ffenc_mpeg4 ! rtpmp4vpay ! udpsink host=127.0.0.1 port=5000 gst-launch udpsrc port=5000 ! application/x-rtp,media=video,payload=100,clock-rate=100000000,encoding-name=MP4V-ES ! rtpmp4vdepay ! video/mpeg,width=640,height=480,framerate=25/1,mpegversion=4,systemstream=false ! avimux ! filesink location=test.avi And I could play this file using gst-launch playbin uri=file:///home/maemo/test.avi <div class="gmail_quote">On Thu, Nov 18, 2010 at 10:02 PM, Peter Innerhofer <<a href="mailto:peter.innerhofer@student.tugraz.at">peter.innerhofer@student.tugraz.at</a>> wrote: <blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">hello, i have an issue with multiplexing and writing a stream to a file. for example: gst-launch v4l2src ! videoscale ! videorate ! video/x-raw-yuv,width=640,height=480,framerate=25/1 ! ffmpegcolorspace ! ffenc_mpeg4 ! avimux ! filesink location=test.avi ok, this stream works fine. vlc can open and show codec meta data. but now i send the stream to a udpsink and receive it. gst-launch v4l2src ! videoscale ! videorate ! video/x-raw-yuv,width=640,height=480,framerate=25/1 ! ffmpegcolorspace ! ffenc_mpeg4 ! udpsrc host=127.0.0.1 port=5000 gst-launch udpsrc port=5000 ! video/mpeg, width=(int)640, height=(int)480, framerate=(fraction)25/1, mpegversion=(int)4, systemstream=(boolean)false ! avimux ! queue ! filesink location=test.avi now the video wont play in vlc and i cant open it in video editing programs which are not based on gstreamer, they can't find any codec details ideas? what's wrong here, i have tried several multiplexer (mpegtsmux,qtmux,ffmux_mp4), but its the same. shall i exit the pipeline in an other way? (not just interrupting it) i build a python script around this pipelines and i can start/stop the stream with keyboard input, setting the pipelines to NULL and to PLAYING.... sometimes the stream is playable in vlc, but mostly not. thx peter ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today <a href="http://p.sf.net/sfu/msIE9-sfdev2dev" target="_blank">http://p.sf.net/sfu/msIE9-sfdev2dev</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> -- Regards, Sudarshan Bisht