Thanks, but IMHO the video is not well done and missing very important steps / information.
I wouldn't recommend it.

At 01:14 Hmm, he is using a Firewire card with a VIA chipset, not so good
Although it might work in a good case of luck, it's recommended to use TI chipsets != XIO2200A, which had defects (but was unfortunately used by many vendors producing such cards).

Which works very well is for example this card: Exsys EX-16415, 3x FireWire 800/1x FireWire, PCIe x1 (TI XIO2213B)
https://geizhals.de/exsys-ex-16415-a375938.html

At around 02:00, make sure that you do not use PCIe slots
- with PCIe lanes that come preferrably from CPU, not from chipset, to proactively prevent, that the connection between CPU and Chipset might become a bottleneck. Its better when the CPU has direct access to the card by using its own PCIe lanes.
- with PCIe lanes that are shared with other components
- a x16 socket, which is typically being used for a 2nd or even 3rd GPU, might have the disadvantage, that
  8 PCIe lanes are dynamically being "stolen"/allocated for this slot if it's being used
So you need to cross check whether your GPU still runs in x16 or in x8 mode.
If I remember right you can use tools like GPU-Z for checking that.

At 2:39, if I remember right Windows 10 has no Firewire driver installed anymore.
And also with Windows 7 you needed an additional step to select and use the Firewire Legacy Driver which worked better than the latest Firewire driver from Microsoft.
And AFAIK this Firewire Legacy driver can be downloaded and has to be installed separately on Windows 10.
This step has been completely skipped by him. Makes me wonder.
So here is the link to get the Windows 10 Firewire legacy driver:
https://www.studio1productions.com/Arti … wire-1.htm

At 02:45, yup it has a VIA Firewire chip, as I said, not so recommended.