Video for Linux (V4L) is not able to recognise whatever (if anything) you have connected to /dev/video0. If you have some input video device connected, maybe you don't have a V4L driver. <div class="gmail_quote"> On Fri, Jul 27, 2012 at 7:17 AM, Mazahir Poonawalla <<a href="mailto:mazahir.poonawalla@ideaforge.co.in" target="_blank">mazahir.poonawalla@ideaforge.co.in</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hi, I tried running an example plugin on leopardboard:gst-launch -v -e v4l2src always-copy=FALSE input-src=composite chain-ipipe=true ! video/x-raw-yuv,format=$fourcc$NV12, width=1280, height=720 ! queue ! dmaiaccel ! dmaienc_h264 encodingpreset=2 ratecontrol=2 intraframeinterval=23 idrinterval=46 targetbitrate=3000000 ! rtph264pay ! udpsink port=$PORT host=$HOST_ADDR sync=false enable-last-buffer=false I also tried the example mentioned in <a href="https://www.ridgerun.com/developer/wiki/index.php/LeopardBoard_365_GStreamer_Pipelines_-_SDK_2011Q2" style="outline:none;color:rgb(220,151,46);text-decoration:none" target="_blank">www.ridgerun.com/.../LeopardBoard_365_GStreamer_Pipelines_-_SDK_2011Q2</a> : gst-launch -e v4l2src always-copy=FALSE input-src=composite chain-ipipe=true ! video/x-raw-yuv,format=$fourcc$NV12, width=1280, height=720, framerate=$fraction$23/1 ! queue ! dmaiaccel ! dmaienc_h264 encodingpreset=2 ratecontrol=2 intraframeinterval=23 idrinterval=46 targetbitrate=3000000 ! rtph264pay ! udpsink port=$PORT host=$HOST_ADDR sync=false enable-last-buffer=false & But I keep getting the error as below: Setting pipeline to PAUSED ...davinci_resizer davinci_resizer.2: RSZ_G_CONFIG:0:1:124 ERROR: Pipeline doesn't want to pause.ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Cannot identify device '/dev/video0'. Additional debug info: ../../../src/sys/v4l2/v4l2_calls.c(573): gst_v4l2_open (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:system error: No such file or directory Setting pipeline to NULL ... Freeing pipeline ...Can someone please help as to what is going wrong?<div> </div>-- Thank you & Regards,Mazahir Poonawalla _______________________________________________ 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>