FIX: The WMV9 encoder performance on a multiprocessor system is severely impaired

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Article ID: 945170 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • On a multiprocessor system, you encode a video by using one of the following:
    • Windows Media Encoder 9 Series
    • An application that is based on the Windows Media Format SDK
  • You compress the video by using one of the following:
    • The Windows Media Video v9 codec
    • The Windows Media Video 9 Advanced Profile codec
In this scenario, the WMV9 encoder performance is severely impaired.

CAUSE

This behavior is due to a bug in the Windows Media Video v9 encoder DirectX Media Object (DMO). The encoder sets an affinity for multiple instances of the DMO to the same single-processor core when the multiple instances are instantiated by the same caller thread.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. 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

The following files are available for download from the Microsoft Download Center.

Windows Vista, 32-bit versions (all languages)

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Download
Download the Windows6.0-KB945170-x86.msu package now.

Windows Vista, 64-bit versions (all languages)

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Download
Download the Windows6.0-KB945170-x64.msu package now.

Windows XP, x86-based versions

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Download
Download the WindowsMedia11-KB945170-x86-INTL.exe package now.

Windows XP, x64-based versions

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Download
Download the WindowsMedia11-KB945170-x64-INTL.exe package now.

Note This hotfix does not have a 64-bit version for Windows XP. This package installs the 32-bit version of this hotfix on the 64-bit version of Windows XP.

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 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 Vista

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File nameFile versionFile sizeDateTimePlatform
Wmvencod.dll11.0.6000.65001,575,42429-Nov-200704:10x86
Wmvencod.dll11.0.6000.65001,891,84029-Nov-200705:06x64

Windows XP

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File nameFile versionFile sizeDateTimePlatform
Wmvencod.dll11.0.5721.52421,574,91227-Nov-200723:59x86

STATUS

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

MORE INFORMATION

Steps to reproduce the problem

  1. Install Windows Media Encoder 9 Series on a multiprocessor computer.
  2. Configure the encoder to encode a multi-bitrate video.
  3. Use a file as a source.
  4. Begin encoding.
  5. In Performance Monitor, notice that only one CPU is near 100 percent.

Properties

Article ID: 945170 - Last Review: March 3, 2009 - Revision: 2.0
APPLIES TO
  • Windows Media Encoder 9 Series
  • Windows Media Encoder 9 Series x64 Edition
  • Microsoft Windows Media Encoder 9 Series SDK
  • Windows Media Format 9.5 Software Development Kit
Keywords: 
kbvistasp1fix kbfix KB945170

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