FIX: Windows Media Audio 9 Speech codec may lose synchronization

This article has been archived. It is offered "as is" and will no longer be updated.
When encoding a live source with the Microsoft Windows Media Audio 9 Speech codec, the audio stream may lose synchronization with the video stream.
The Windows Media Audio 9 Speech codec is not correctly handling frequency oscillator drift in the audio clock. This may cause audio and video synchronization problems to occur.
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next release that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Microsoft Windows XP

The following file is available for download from the Microsoft Download Center:
DownloadDownload the WindowsXP-KB884723-v2-x86-Enu.exe package now.

Microsoft Windows 2000 and Microsoft Windows Server 2003

The following file is available for download from the Microsoft Download Center:
DownloadDownload the WindowsMedia9-KB884723-x86-Enu.exe package now.

For additional 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 to prevent any unauthorized changes to the file.

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 tool in Control Panel.
   Date         Time   Version            Size    File name   --------------------------------------------------------------   01-Sep-2004  20:56        485,376  Wmspdmod.dll        01-Sep-2004  20:56        897,024  Wmspdmoe.dll     
Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.
WMP WME speech codec synchronization

Article ID: 884723 - Last Review: 01/13/2015 00:02:51 - Revision: 3.0

  • Windows Media Encoder 9 Series
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