liveview loop

not sure what the rectangle in the image really is. i simply set the camera on remote liveview mode and display the feed on my lappie, and then set the lens to closest focus and point it at the onscreen video feed. essentially the camera keeps on re-capturing what it has just seen a moment ago, but what actually is it seeing in the first place? the rectangle is moving around, fading in and out of view - sort of like a screensaver animation. a jerky animation, that is - due to the crappy framerate of the usb liveview feed. hmm...