I hope this is an easy one for someone here, and I apologize if I'm asking in the wrong place. And please forgive what I'm sure must be a dumb question, but I'm stumped. Even just tips of where else to look for the answer would be gratefully welcomed. I'm using a simple C program to launch a trivial pipeline with a videotestsrc sourcing to an xvimagesink. My demonstration source is at: <a href="http://vps01.westbrook.com/movewin.c">http://vps01.westbrook.com/movewin.c</a> Creating and launching the pipeline from C is easy enough and works fine. The trick (to me) is that I want it to be placed in an undecorated X11 window at specific screen coordinates, and I'm unable to so far. From what I gather from reading everything I can find, for best results this should be done using the "prepare-xwindow-id" message sent by the xvimagesink element, and responding with the created window ID using the "gst_x_overlay_set_xwindow_id()" method of the xoverlay interface. I'm doing this, and I do indeed get a request message, and respond to it. It doesn't seem like a terribly complicated transaction, but it's not working for me and I'm at a loss as to why. Try as I might, video appears in xvimagesink's self-created window rather than mine, with decorations, anywhere on the screen that the WM feels like putting it. Would anyone mind taking a quick glance to see what I'm doing wrong? I hope it's obvious to someone with more gstreamer under their belt than me. Also, when it's working, would a well-documented example of this technique be good to share on an examples page of some kind? (Or if one exists already, pointers appreciated; I couldn't find one.) Thanks for any help! E. Westbrook