![]() Some video overlay devices write the digital video signal directly into the graphics card's video memory or provide it to the graphics card's RAMDAC.Because of the much greater processing power of modern graphics cards, and the awkwardness of adding additional analog hardware signal processing path, this method is now little used. ![]() The driver software informs the video overlay device about the desired position of the video window on screen. The device modifies the VGA signal and inserts the analog video signal overlay into the picture the rest of the screen is filled by the signal coming from the graphics card.
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