<div>Hi ,</div> <div> </div> <div> videomixer works on AYUV ( that means yuv data having alpha values for transparency ) and pngdec gives RGB data , that's why these two elements are not linking . </div> <div> </div> <div>Try putting ffmpegcolorspcae after pngdec . <br><br></div> <div class="gmail_quote">On Wed, Mar 31, 2010 at 12:58 AM, Vogan <span dir="ltr"><<a href="mailto:vaughan@infact.co.nz">vaughan@infact.co.nz</a>></span> wrote:<br> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><br>Hi<br><br>I am wanting to overlay an image (crosshairs inthis case) on top of a stream<br>from a web cam. The image is a png file with a transparent background. The<br> pipeline I have tried is<br><br>gst-launch v4l2src device=/dev/video0 !<br>'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! videomixer name=mix<br>! xvimagesink ! filesrc location=crosshair.png ! pngdec ! mix.<br> <br>When I try to run this I get WARNING: erroneous pipeline: could not link<br>pngdec0 to mix<br><br>Any hints on what I am doing wrong? or is it simply not possible to overlay<br>a static image on a live stream?<br><br> Vaughan<br><br>--<br>View this message in context: <a href="http://n4.nabble.com/Overlaying-an-image-on-a-live-stream-tp1745726p1745726.html" target="_blank">http://n4.nabble.com/Overlaying-an-image-on-a-live-stream-tp1745726p1745726.html</a><br> Sent from the GStreamer-devel mailing list archive at Nabble.com.<br><br>------------------------------------------------------------------------------<br>Download Intel&#174; Parallel Studio Eval<br>Try the new software tools for yourself. Speed compiling, find bugs<br> proactively, and fine-tune applications for parallel performance.<br>See why Intel Parallel Studio got high marks during beta.<br><a href="http://p.sf.net/sfu/intel-sw-dev" target="_blank">http://p.sf.net/sfu/intel-sw-dev</a><br> _______________________________________________<br>gstreamer-devel mailing list<br><a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a><br><a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a><br> </blockquote></div><br><br clear="all"><br>-- <br>Regards,<br><br>Sudarshan Bisht<br>