Article ID: 2633829 - View products that this article applies to.
When you play a video in Windows Media Player on a computer that is running Windows MultiPoint Server 2011, Windows Media Player displays a black screen instead of the expected video.
This issue occurs because some systems and applications exhibit instability when lots of stations simultaneously redirect video for decoding by the graphics processing unit (GPU). The number of stations required to cause this issue depends on your graphics subsystem and on the video decoding capabilities of your hardware.
To resolve this issue, install the update rollup that is described in the following Microsoft Knowledge Base article:
(http://support.microsoft.com/kb/2626067/ )Update Rollup 1.1 for Windows MultiPoint Server 2011
Registry informationImportant This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756You can control the maximum number of stations that have redirected video by editing the registry. To do this, follow these steps:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
If you decide not to redirect video on some of your stations, the stability of applications such as Windows Media Player can still be improved, but at the cost of increasing the CPU load of the computer. This behavior may result in slower system performance.
Note This setting does not apply to websites that feature Flash video playback. For example, this setting does not apply to Youtube.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates