If the computer system meets the hardware and software requirements to run Windows Aero, you may be able to reduce or eliminate the problem by enabling Aero. In this case, there may be unavoidable tearing on the second monitor. Even though the two monitors are configured for the same refresh rate (for example, 60 Hz), the second monitor may not be refreshed at the same time. Some video hardware supports multiple monitors but does not synchronize the display redraw timing of the two monitors. When windows synchronizes DVD playback with the monitor refresh rate, it synchronizes with the timing of the primary monitor. The video frame is updated during the vertical blanking interval so that the complete, correct frame will be displayed without any tearing every time that the video card refreshes the monitor. When it is playing video content such as a DVD, the operating system has to synchronize playback with the display redraw rate. There may be a noticeable horizontal line at the point where the two frames meet. This is more noticeable during scenes that contain fast motion. This problem occurs because of a hardware limitation that is known as "tearing." Tearing is a video artifact in which the top portion of the screen shows a different frame of video than the bottom portion. In this scenario, you notice a cut line in the video on one of the monitors. You play a DVD movie in Windows Media Player or a third-party video application. Your display is not set to use Windows Aero. You have the Duplicate (Clone Mode) display configured. Your computer supports two or more monitors. You have a computer that is running Windows Vista or a later Windows operating system.
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