Can't get stream point when attached two devices into a usb hub

Discussion in 'Windows Vista Drivers' started by WilliamX, Aug 4, 2006.

  1. WilliamX

    WilliamX Guest

    Hi all,
    I encountered this issue when I attached two usb dvbt devices into my pc
    by one usb hub.
    I called KsPinGetLeadingEdgeStreamPointer in a system thread. Just after
    run the graph,
    KsPinGetLeadingEdgeStreamPointer could return stream pointer, but some
    seconds later,
    it always returned NULL.

    When I attached the two device into the pc directly(no through usb hub),
    it could work well.

    I have no idea about this issue. Could you gurus give me some comments or
    indicate how
    to debug this issue?

    WilliamX, Aug 4, 2006
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