KB192112 - Video Capture WDM Driver Does Not Work in Windows 98

PSS ID Number: 192112

Article Last Modified on 5/8/2002

The information in this article applies to:

Microsoft Windows 98

This article was previously published under Q192112

SYMPTOMS

Programs that use the Microsoft Video for Windows 1.1 (VFW) interface cannot directly communicate with analog video capture devices that use the Windows Driver Model (WDM) video capture interfaces in Windows 98. Such analog capture devices may include PCI adapters with video decoder chips that use WDM drivers.

CAUSE

The VFW WDM Mapper files included with Windows 98 do not allow WDM-based analog capture devices to be used with the VFW 1.1 interface.

RESOLUTION

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

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.

   File name     Version    Date     Time    Size
   ------------------------------------------------------
   Vfwwdm.drv    4.10.2043  8/10/98  9:35pm  15,344 bytes
   Vfwwdm32.dll  4.10.2043  8/10/98  9:38pm  56,832 bytes
   Kswdmcap.ax   4.10.2043  8/10/98  9:29pm  51,712 bytes

STATUS

Microsoft has confirmed this to be a problem in Microsoft Windows 98.

This problem was corrected in Windows 98 Second Edition.

MORE INFORMATION

The following text appears in the "Video Capture Devices" section of the Hardware.txt file included with Windows 98. This file is located in the Windows folder after Windows 98 is installed.

Windows Device Manager Video Capture Devices
and Video for Windows Applications
--------------------------------------------

Applications that use the Video for Windows 1.1 (VFW) interfaces also use drivers that conform to the VfW 1.1 driver interfaces. However, with the new Windows Device Manager (WDM) video capture interfaces in Windows 98, applications can no longer use the VfW interfaces to directly communicate with these WDM-based devices. Windows 98 includes a software layer that translates VfW 1.1 interfaces into WDM video capture interfaces. This translation software works only for video capture devices on external busses (USB and 1394) in Windows 98. Analog capture devices (such as PCI cards with video decoder chips that use WDM drivers) cannot use this translation software. The original VfW drivers for these analog capture devices will continue to work but they cannot be used in combination with the newer WDM drivers. In the future, an updated version of this translation software will be available that allows WDM-based analog capture devices to be used through the VfW 1.1 interfaces.

The VFW translation described in the above text comprises the updated files described in this article, which allows WDM-based analog capture devices to be used with the VFW 1.1 interface.

For additional information about Windows 98 and Windows 98 Second Edition hotfixes, click the article number below to view the article in the Microsoft Knowledge Base:

206071 General Information About Windows 98 and Windows 98 Second Edition Hotfixes

Keywords: kbdisplay kbHardware kbprb KB192112
Technology: kbWin98 kbWin98search