Using two FireWire 800 ports on Express Card with Windows 7 for simultaneous viewing of camcorder capture RRS feed

  • Question

  • I am trying to set up two firewire camcorders to record two seperate videos, at the same time, using a FireWire 800 Express card. 

    I have been told the reason this does not work is because of Windows and Active X issues, rather than an issue with the software.  The limitation has been described as follows:  "Some FireWire cards have more than one port.  However, if you plug more than one camera into a single FireWire card, you will only get the feed from one camera, if that.  This is because the camcorders set teh FireWire bus to 100 Mbps, yet each camcorder requires more than 50 Mbps of bandwidth.

    The camcorders set the FireWire bus to 100 Mbps even though the default speed of most FireWire buses is 400 Mbps (or 800 in the case of the 1394B).  This is a hardware limitation, confirmed with Microsoft, not a problem specific to the software."

    Has anything changed with this in Windows 7?  I am trying run two camcorders, and would love to know if there is any kind of solution.  The only way to get a live video feed is by using the FireWire cable. 

    Any information would be appreciated.

    Thursday, February 17, 2011 12:21 AM


  • Those add-ins cards are not very powerful.

    If you need live feeds, use PCI Express cards which are far faster. Notebooks do not have that kind of bandwidth like a modern PC has.

    USB3 is early in the cycle, but it will gain ground once better chipsets surface.


    My MVP is for Windows XP, Vista and Windows 7 IT, and I am getting increasingly good with Visual Studio.

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    • Marked as answer by Juke Chou Thursday, February 24, 2011 8:47 AM
    Thursday, February 17, 2011 12:45 AM