James, try HDV Split (it’s free).
https://strony.aster.pl/paviko/hdvsplit.htm
It could also be that you need try a legacy firewire driver.
Click Start
Then click on Control Panel
Click on Device Manager
Under the Device Manager, look down the list for IEEE 1394 Bus Host Controllers and Double Click on it.
It should display something like – 1394 OHCI Compliant Host Controller. If it has the word (Legacy) behind it, you are already setup and your problem lies elsewhere.
Next, double click on the 1394 OHCI Compliant Host Controller
A window will popup saying 1394 OHCI Compliant Host Controller
Properties
Click on the Driver Tab
Then look down in the widow and click on Update Driver
Then select – Browse my computer for driver software
Next select – Let me pick from a list of device drivers on my computer
It will bring up a list of drivers.
Click on 1394 OHCI Compliant Host Controller (Legacy)
Click Next
Once it installs the 1394 OHCI Compliant Host Controller (Legacy),
it will say Windows has successfully updated your driver software.
Click on the Close button and exit out of all of the other windows.