Microsoft KB Archive/904415

= FIX: Motion appears jittery and unnatural when you re-encode content in an application that was built by using the Windows Media Format 9.5 SDK =

Article ID: 904415

Article Last Modified on 6/2/2006

-

APPLIES TO


 * Windows Media Format 9.5 Software Development Kit x64 Edition

-





SYMPTOMS
When you re-encode content from a higher frame rate to a lower frame rate and then play back the re-encoded content, motion appears jittery and unnatural. This problem occurs when the application that you use to re-encode the content was built by using the Microsoft Windows Media Format 9.5 Software Development Kit (WMFSDK).



CAUSE
The application that you use to re-encode the content drops the wrong frames. This problem occurs because the algorithm for dropping frames does not provide a consistent dropping pattern when you re-encode content from a higher frame rate to a lower frame rate.



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 SDK 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.

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:

891122Update for Windows Media Digital Rights Management-enabled players

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

Download the WindowsMedia10-KB904415-x86-INTL.exe 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.

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.   Date         Time   Version      Size       File name ---  10-Aug-2005  16:24  10.0.0.3945  2,374,392  Wmvcore.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
An example of this problem is re-encoded content that was originally encoded at 24 frames per second (fps). The content was re-encoded at 12 fps. When the re-encoded content is played back, the expected frame output is the following series:

1, 3, 5, 7, 9, and so on

However, the actual frame output is not the expected series. Therefore, you experience the problem that is mentioned in the &quot;Symptoms&quot; section.

Additional query words: WMFSDK frame drop logic

Keywords: kbfix kbqfe kbhotfixserver KB904415

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.