video tools of X11 application.

1. Set tool in an X11 application

Hy !
I would like to have information about a X11 application which set TV.
I have a capture card and I want to add text on the screen with color incrustation. I mean that when a peace of the
video has a determined color, the picture is switched with an another. That's like meteo!
If somebody has already work on it, thanks for giving informations.

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