FIX: Windows Media Player 11 cannot play some Windows Media content that was created by a Windows Media Format SDK-based application

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Article ID: 946665 - View products that this article applies to.
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SYMPTOMS

Microsoft Windows Media Player 11 cannot play some Windows Media content that was created by a Windows Media Format SDK-based application, such as Microsoft Windows Media Encoder. You may experience one of the following playback issues:
  • No video is displayed.
  • The seek bar does not move as the video plays.
  • The video is slow to start after you move the seek bar.

CAUSE

This behavior occurs because Windows Media Encoder and similar Windows Media Format SDK-based applications can create a "phantom stream" in the ASF container. This is extra payload data that is not defined in the ASF header where there is no stream properties object for the stream. This behavior is by design. However, Windows Media Player 11 does not appropriately handle this uncommon scenario.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, obtain the hotfix from the Microsoft Download Center.

Download information for Windows XP for x86-based computers (all languages)

The following file is available for download from the Microsoft Download Center:

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Download
Download the WindowsMedia11-KB946665-x86-INTL.exe package now.

Download information for Windows XP for x64-based computers (all languages)

The following file is available for download from the Microsoft Download Center:

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Download
Download the WindowsMedia11-KB946665-x64-INTL.exe package now.

Note This hotfix does not have a native x64-based version for Windows XP x64 Edition because there is no native x64-based version of the Windows Media Format Runtime 11 series. The WindowsMedia11-KB946665-x64-INTL.exe package applies the 32-bit version of this hotfix to the 32-bit version of the Wmvcore.dll file on Windows XP x64 Edition.

Download information for Windows Vista, 32-bit versions (all languages)

The following file is available for download from the Microsoft Download Center:

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Download
Download the Windows6.0-KB946665-v2-x86.msu package now.

Download information for Windows Vista, 64-bit versions (all languages)

The following file is available for download from the Microsoft Download Center:

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Download
Download the Windows6.0-KB946665-v2-x64.msu package now.

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
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Hotfix file information

The global 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 XP (all languages)
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File nameFile versionFile sizeDateTimePlatform
Wmvcore.dll11.0.5721.52452,457,60019-Feb-200823:54x86
Windows Vista
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File nameFile versionFile sizeDateTimePlatform
Wmvcore.dll11.0.6000.65012,436,09622-Feb-200804:52x86
Wmvcore.dll11.0.6000.65012,956,80022-Feb-200804:55x64
Windows Vista Service Pack 1
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File nameFile versionFile sizeDateTimePlatform
Wmvcore.dll11.0.6001.71002,386,94422-Feb-200804:51x86
Wmvcore.dll11.0.6001.71002,900,48022-Feb-200805:20x64

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

Steps to reproduce the problem

  1. Create a Windows Media Format SDK-based application that archives content.
  2. Use this application to stop an archive without stopping the encoding session.
  3. Change the output file name, and then restart the archive.
  4. Encode for approximately one hour.
  5. Embed Windows Media Player in a Web page, and then play the content that you created in step 4.
  6. Move the seek bar.

    After you move the seek bar, playback starts more slowly than expected.

Properties

Article ID: 946665 - Last Review: September 27, 2011 - Revision: 2.0
APPLIES TO
  • Windows Media Player 11
Keywords: 
kbfix KB946665

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