Microsoft KB Archive/118390

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Video for Windows 1.1--Automatic Window Shift Problem

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Q118390

3.10 4.00 WINDOWS kbmm kbprg

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The information in this article applies to:


 * Microsoft Platform Software Development Kit (SDK), on platform(s):
 * Microsoft Windows versions 3.1, 3.11
 * Microsoft Windows NT Server version 4.0
 * Microsoft Windows NT Workstation version 4.0

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When a video playback window is created using MCI, the Video for Windows (VfW) system software may shift the window a small distance vertically or horizontally from the original location.

The video software does this to align the window on even-byte boundaries in video memory for optimal playback speed. When the window is located on a byte boundary, the video software is not required to perform bit-intensive calculations during video playback, increasing the playback speed.

This behavior is particular to Video for Windows and cannot be controlled by the application being affected.

Additional query words: 3.10 4.00 95

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Issue type :

Technology : kbWin32SDKSearch kbAudDeveloper kbSDKSearch