Hello, I have to replace the background (made of one single color) of an application (which I cannot modify) by the video from an other PC. I can acquire the video from the other PC with a frame grabber card (UFG-03 from Unigraf), but I'm not able to change the background of the application by hardware overlay because this card doesn't do it... I'd like to know if there's a way to access the frame Buffer of X11 to change the background of the application or to set the black color of this application transparent... The video from the other PC isn't static... so i have to make a loop like: - grab a frame from the PC video - replace the color background with the frame maybe there is a way to do a kind of software overlay ?? An other idea I had is to launch the application I cannot modify somewhere i won't see it, capture the display of this application and merge it with the frame from the PC, then I do the final display in my application or maybe i have to do it an other way but i have no more idea... thanks for your help, Franck