Microsoft KB Archive/925888

= Bitstream errors occur when you use the Windows Media Video 9 Advanced Profile codec in Windows Media Player 11 =

Article ID: 925888

Article Last Modified on 3/17/2007

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APPLIES TO


 * Microsoft Windows Media Player 11
 * Windows Vista Home Basic
 * Windows Vista Home Premium
 * Windows Vista Ultimate
 * Windows Vista Business
 * Windows Vista Enterprise
 * Windows Vista Starter
 * Windows Vista Home Basic 64-bit edition
 * Windows Vista Home Premium 64-bit edition
 * Windows Vista Ultimate 64-bit edition
 * Windows Vista Business 64-bit edition
 * Windows Vista Enterprise 64-bit edition
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional

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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
Consider the following scenario: You use the Windows Media Video 9 Advanced Profile codec that is included with Windows Media Player 11 on a computer that is running Microsoft Windows XP or Windows Vista. You configure the Motion Vector Coding Method registry setting with a value of 1, 2, or 3 to code the motion vector information in field pictures. Then, you configure the Video Type registry setting with a value that indicates interlaced encoding. Also, you leave the Motion Search Range registry setting at the default value.

In this scenario, the resulting Windows Media Video bitstream may be incompliant with the VC-1 video codec specification. Because of this problem, bitstream errors may occur.



CAUSE
This problem occurs because you can only use extended delta Motion Vector if extended Motion Vector mode is enabled.



RESOLUTION
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To resolve this problem, use the Motion Vector Coding Method registry setting with a value of 1, 2, or 3 when the Motion Search Range registry setting is set to a non-default value. A non-default value is a value that is not zero. For safe measure, avoid using the option when you are encoding interlaced video. Also, avoid using the option when the Video Type registry setting is not set to a value of 0.



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 the advanced settings of the Windows Media Video 9 Advanced Profile codec that are enabled through registry settings, visit the following Microsoft Web page:

http://www.microsoft.com/windows/windowsmedia/howto/articles/codecadvancedsettings.aspx

Keywords: kbtshoot kbprb kbexpertiseadvanced KB925888

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