When applications that use the Video Mixer Renderer (VMR) try to play back anamorphic content, the resultant video may be scaled incorrectly. Anamorphic content is found on some DVD titles and Advanced Television Systems Committee (ATSC) output. For example, high definition television tuner cards produce ATSC output. Inappropriate scaling may occur when applications display anamorphic content or switch between content with square pixels and non-square pixels.
This issue occurs because the VMR does not always use the video stream as the master stream. This behavior occurs if the anamorphic video contains one or both of the following streams:
A subpicture stream
A closed caption stream
If either of these streams have square pixels or a 4:3 aspect ratio, the video stream may be incorrectly scaled.
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
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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.
Date Time Version Size File name -------------------------------------------------------- 08-Dec-2004 23:55 6.5.2600.2578 1,287,168 Quartz.dll
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.