try adding queue before all the mix. <div class="gmail_quote">On Wed, Sep 21, 2011 at 2:04 PM, amirulsyahmi <<a href="mailto:amirulsyahmi@gmail.com">amirulsyahmi@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Hi all I need to play 4 video files in one screen. After doing some research I find this code gst-launch -e videomixer name=mix ! ffmpegcolorspace ! xvimagesink \ videotestsrc pattern=1 ! video/x-raw-yuv, framerate=5/1, width=320, height=180 ! videobox border-alpha=0 top=0 left=0 ! mix. \ videotestsrc pattern=15 ! video/x-raw-yuv, framerate=5/1, width=320, height=180 ! videobox border-alpha=0 top=0 left=-320 ! mix. \ videotestsrc pattern=13 ! video/x-raw-yuv, framerate=5/1, width=320, height=180 ! videobox border-alpha=0 top=-180 left=0 ! mix. \ videotestsrc pattern=0 ! video/x-raw-yuv, framerate=5/1, width=320, height=180 ! videobox border-alpha=0 top=-180 left=-320 ! mix. \ videotestsrc pattern=3 ! video/x-raw-yuv, framerate=5/1, width=640, height=360 ! mix. which will display like this <a href="http://gstreamer-devel.966125.n4.nabble.com/file/n3829313/GstVideoWall.png" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/file/n3829313/GstVideoWall.png</a> bu then I need it to play mp4 files. and I try this code gst-launch -e videomixer name=mix ! ffmpegcolorspace ! xvimagesink \ filesrc location=./Cityscape1Min_720p_mp4.mp4 ! decodebin2 ! videorate ! video/x-raw-yuv, framerate=5/1, width=320, height=180 ! videobox border-alpha=0 top=0 left=0 ! mix. \ filesrc location=./Cityscape1Min_720p_mp4.mp4 ! decodebin2 ! videorate ! video/x-raw-yuv, framerate=5/1, width=320, height=180 ! videobox border-alpha=0 top=0 left=-320 ! mix. \ filesrc location=./Cityscape1Min_720p_mp4.mp4 ! decodebin2 ! videorate ! video/x-raw-yuv, framerate=5/1, width=320, height=180 ! videobox border-alpha=0 top=-180 left=0 ! mix. \ filesrc location=./Cityscape1Min_720p_mp4.mp4 ! decodebin2 ! videorate ! video/x-raw-yuv, framerate=5/1, width=320, height=180 ! videobox border-alpha=0 top=-180 left=-320 ! mix. \ filesrc location=./Cityscape1Min_720p_mp4.mp4 ! decodebin2 ! videorate ! video/x-raw-yuv, framerate=5/1, width=640, height=360 ! mix. and the display suppose to be like this <a href="http://gstreamer-devel.966125.n4.nabble.com/file/n3829313/paintami.png" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/file/n3829313/paintami.png</a> but i doesn't work. really need help in this matter. Thanks -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/VideoWall-MP4-files-gstreamer-tp3829313p3829313.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/VideoWall-MP4-files-gstreamer-tp3829313p3829313.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> -- <a href="http://www.linkedin.com/in/kapilagrawal" target="_blank">http://www.linkedin.com/in/kapilagrawal</a> <a href="http://www.mediamagictechnologies.com" target="_blank">www.mediamagictechnologies.com</a> (Consultancy - Multimedia, Gstreamer, ffmpeg, Streaming for platforms- linux, windows, TI, android)