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Article ID: 326464 - Last Review: September 27, 2005 - Revision: 1.2

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This article was previously published under Q326464

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After you start your computer, although some conferencing cameras enumerate correctly and appear in Device Manager with no errors, they do not stream video.


With certain 1394 topologies at startup time, the 1394 host controller driver (1394Bus.sys/OHCI1394.sys) incorrectly chooses the wrong 1394 node as the Cycle Master. This results in no start cycle packets and, therefore, no isochronous streaming.


To work around this problem so that the camera correctly streams video, follow these steps:
  1. Unplug the conferencing camera.
  2. Plug the camera in again.
  3. Restart the program; this causes a bus reset and solves the problem.


The English version of this fix has the file attributes (or later) 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     Operating system
15-AUG-2002  09:31  5.1.2600.54    49,792  1394BUS.SYS  Windows XP


Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

  • Microsoft Windows XP Professional
kbbug kbfix kbqfe kboswin2000fix kbwinxpsp1fix kbhotfixserver KB326464
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