Microsoft KB Archive/277813

= Unable to Preview Digital Video with Some Third-Party Digital Video Drivers =

Article ID: 277813

Article Last Modified on 1/29/2007

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APPLIES TO


 * Microsoft Windows Millennium Edition
 * Microsoft Windows 98 Second Edition

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This article was previously published under Q277813



SYMPTOMS
When you use a third-party digital video camera driver, you may be unable to preview video images. Note that this problem may occur on computers that are running Windows Millennium Edition (Me), or on computers that are running Windows 98 Second Edition and have installed the hotfix that is documented in the following Microsoft Knowledge Base article:

243174 Microsoft Digital Video May Lose IEEE 1394 Device Audio



CAUSE
This problem can occur if all of the following conditions exist:
 * The software that is being used to display the video preview image uses the &quot;Smart Tee&quot; DirectShow filter.
 * The digital video camera driver reports a video sample buffer size that is different from the actual data size.



RESOLUTION
To work around this problem, developers of digital video camera drivers can set the buffer size (m_cbBuffer) to the same size as the actual length (m_lActual) of the sample, and verify that both of these values are set to the correct value for the video format (NTSC or PAL) that is being used.



STATUS
Microsoft has confirmed that this is a problem in Windows Millennium Edition.

Microsoft has confirmed that this is a problem in Windows 98 Second Edition that includes the hotfix from Microsoft Knowledge Base article Q243174.



MORE INFORMATION
This problem is known to occur with the following digital video camera drivers:
 * Texas Instruments 1394 DVCR Windows Driver Model (WDM) driver (Dvcam.sys) version 3.3.0.0

Keywords: kbenv kbnofix kbprb KB277813

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