EnDIVE calls a driver escape (PutImage) for every frame to be put on the screen. When the window is completely obscured or minimized, there are no calls into the driver, even if the video continues to play. For devices that are blitting to the screen, this sequence is acceptable. However, for overlay devices, the video is still on. If another window uses the driver color key color in the area, there will be bleed through. Furthermore, there exists certain situations where RGB and YUV data can be present simultaneously in the frame buffer. If the YUV video data is overpainted by RGB graphics data without adjustments to the data mapping, some of the RGB data will be misinterpreted and cause large patches of video noise on the screen. DEVESC_VIDEOHIDDEN informs the driver that the video is hidden, so that the driver has a chance to turn off video acceleration if necessary.