When using a PC with a second display (for example a laptop with a data projector) it is often a common problem to find that a video played with Windows Media Player will only display on the primary display, and not on the secondary output.
There are various different configurations which contribute to this behaviour — Windows settings, Windows Media Player settings and Graphics Card driver settings.
One possible solution is to change which display windows treats as the primary display via the display control panel, but this is not always possible or suits the way you use the displays.
If you have an ATi video adaptor then you can tweak these settings in the “advanced” version of catalyst control centre. Under “Video” : “Theatre mode”, change “second display” from “in standard mode” to either of the other 2 选项.
If you have an nVidia video adaptor there is a similar option, called “fullscreen video mirroring”, although I don’t have specific instructions at present.
更新 1: If you have an Intel adaptor when you switch to “clone mode” you should get video output on both outputs
If none of the above solutions work for you than as a last resort you can try the following, which may work, depending on your video adaptor settings.
Right click on the media player logo at the very top left of the media player window, and select “tools” then “options”
Click on the performance tab, and then click on the advanced button
Untick 2 instances of “Use Overlays” which appear in the “video acceleration” and “dvd video” sections
Click OK to close the various windows
You may need to restart media player
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