Microsoft KB Archive/887131

= FIX: A problem may occur with audio and video synchronization when certain TV capture cards are used =

Article ID: 887131

Article Last Modified on 6/2/2006

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft DirectX 9.0b

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SYMPTOMS
A problem may occur with audio and video synchronization when content is captured and is played back by using certain TV capture cards in a DirectShow filter graph.



CAUSE
Certain DirectShow filter graphs that are used to playback captured content from a TV capture card may lack a correct reference clock. A correct reference clock is required for correct audio and video synchronization.



RESOLUTION
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:

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

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.

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.

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-Oct-2004  22:53  6.5.2600.2524   1,287,680  Quartz.dll



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



MORE INFORMATION
This hotfix creates a reference clock configuration that permits audio and video synchronization. Audio and video synchronization is permitted provided that the underlying driver reveals a &quot;ksproxy&quot; audio pin. The waveout audio path is no longer supported for this scenario. Contact your driver manufacturer to make sure that the &quot;ksproxy&quot; audio pin is correctly revealed.

For more information about Microsoft DirectX and to view the DirectX documentation, visit the following Microsoft Developer Network (MSDN) Web site:

http://msdn.microsoft.com/directx

Additional query words: Quartz synchronization KSProxy

Keywords: kbtshoot kbfix kbqfe kbhotfixserver KB887131

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