FIX: A custom application that you created by using the Windows Media Format 9.5 SDK may stop responding or connected clients may briefly enter a buffering state

This hotfix addresses the following two issues:

• Consider the following scenario. You have created a custom application by using the Microsoft Windows Media Format 9.5 Software Development Kit (SDK). The application has two instances of a network sink in the same process. When the application calls the Close method on the IWMWriterNetworkSink interface, the application may stop responding.
• If the two network writers end at different times, the writer that is still streaming content may cause connected clients to briefly enter a buffering state.

The application is waiting for all instances of the network sink to be closed before shutting down.

Hotfix information

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 Windows Media Format 9.5 SDK service pack 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.

Prerequisites

You must have the update that is described in Microsoft Knowledge Base (KB) article 891122 installed to apply this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Download information

The following file is available for download from the Microsoft Download Center:
For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: 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.

Registry information

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 your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

By default, the fix for the second issue that is mentioned in the "Symptoms" section is not enabled. You must set a registry to enable this fix. To do this, follow these steps:

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. In Registry Editor, locate the following registry entry:
   HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General
3. Right-click General, point to New, click DWORD Value, and then type MultipleNetworkWritersFix. By default, the MultipleNetworkWritersFix value is set to 0.
4. To enable the hotfix, set the MultipleNetworkWritersFix value to 0x1.
5. Quit Registry Editor.

File information

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.

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

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: