Microsoft KB Archive/943195

= The TV screen appears as solid green or as blocky pixels when you use Windows Media Center to watch HDTV content on a Windows Vista-based computer =

Article ID: 943195

Article Last Modified on 10/29/2007

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APPLIES TO


 * Windows Vista Ultimate
 * Windows Vista Home Premium
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition

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SYMPTOMS
Consider the following scenario:
 * You use Windows Media Center to watch high-definition television (HDTV) on a Windows Vista-based computer.
 * You have installed the 932968 hotfix on the computer.
 * You do one of the following:
 * You switch the HDTV format between the 1080i format and the 720p format.
 * You open a different DVR-MS file.
 * You change the live TV programming to a different high-definition channel or to a different standard-definition channel.

In this scenario, the TV screen may appear as solid green, or it may appear as blocky pixels. This behavior continues until the next key frame is displayed.



CAUSE
This issue occurs because the Microsoft MPEG2 decoder does not correctly flush the previous key frames.



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
No prerequisites are required.

Restart requirement
You do not have to restart the computer after you apply this hotfix.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Vista, 64-bit versions


STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For more information about key frames, click the following article number to view the article in the Microsoft Knowledge Base:

269068 Understanding frames per second (FPS)

HDTV programs are encoded by using certain formats, such as 720p and 1080i. The numeric value in the format reference refers to the number of lines that are embedded in the TV signal. The letter refers to the type of scan that the television uses to display the picture. The letter &quot;i&quot; means interlaced, and the letter &quot;p&quot; means progressive.

Keywords: kbqfe kbexpertisebeginner kbhotfixserver KB943195

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