Can you make video source with "Moving logo", like in Ekiga. This feature is helpful when testing connection between hosts without webcams. It is not necessary to do exactly "moving logo". It can be any animation. For example: - moving users static picture - fade-in/fade-out static pucture - some text (local time, call time) - selected video file (in loop) - graphical voice analyzer/VU-meter - "whitesnow"
It's enough any of this or some other. The key feature - it must be not static.