This list should cover what is supported in Vegas Pro 12 as well.

Savant3D - beware- gave you the "expensive" list of capture - and note this is said to be compatible with VegasPro 10 AND NOT 12!!!

I know for actual fact that BMD does not support VegasPro12 as their cooperative agreement with SCS failed this last year. NOW, that does not mean you could not kludge a system together to make it happen - it is just not SUPPORTED!

Generally the same for AJA AFAIK.

Any decent firewire capture card can be hooked into VegasPro12.

Yes, I gave the OP the last official professional list. Virtually any firewire card using the TI chipset is also universally supported, but firewire, by it's nature, is not a modern or professional video capture interface. HD-SDI is. And HDMI capture in and of itself is already a kludge, but many of us bought the BlackMagic Intensity Pro cards and suffered through the pre-Vegas Pro 10 kludges necessary to make it work.

But since you "know for actual fact" that BMD and AJA cards are not supported, please remind Sony to remove them from this page.

SCS has chosen a route of management of information through various marketing vehicles including their website to give only the information that is necessary to stay in business. That is, they state that BMD had a relationship agreement for third-party implementation thru the VegasPro9 to Pro 10 development year. That is what is implied by the page link given and SCS has no further obligation in their view to offer more info than what is stated.

Capture systems can include many types of devices - but for the moment VegasPro12 is in practice supported by firewire transport of media streams. You can choose many outboard boxes to transfer any other video stream, be it SDI, analogue component, or SVHS Y/C into a firewire transported stream.

I'm struggling to find even one professional firewire400 video I/O interface for windows. [I have, however, found some

Can you provide a link or some examples?

What do you want to accomplish? What is your source video material , where is it coming from?

Are you content to work in VegasPro as you are holding to an 8-bit capture and compositor level? Do you do a lot of compositing with the source video and want to work with intermediaries in the post processing?

Are your sub-systems built on high-speed raid with multiple concurrent stream support?

What level do you want in your output, - 8bit? What is your destination video product,- Blu-ray disc or web displays?

All of these issues have a bearing on what video capture solution is going to be cost effective.

Struggling? HP make one of the simplest to install and rock solid reliable Firewire card on the market. I live in Australia and bought one from the USA, it arrived in 10 days.

Its curious that people in these forums ask for links but don't recognize this is an International forum, read by every country in the world with Internet. Maybe if you search some of the PC suppliers in your country you'll find on listed?

I use a USB3 BlackMagicDesign HDMI interface called Intensity Shuttle. I feed my Canon XH A1 camera's component output (RGB) into it. I can monitor what is being shot on any HDMI TV simultaneously feeding the camera's output directly into Vegas for editing.

There is absolutely nothing you can't 'get' to feed a video camera's output into a PC... You just have to look for what is your best solution.

"HP make one of the simplest to install and rock solid reliable Firewire card on the market."

I think maybe you've missed the point: firewire cards are very common and inexpensive. An I/O device, on the other hand, would be something that converts an HDMI or HD-SDI source into a stream that is carried over firewire, [USB 3.0, PCIe bus, etc] so that it can be recognized by Vegas and on-the-fly conversion to MXF or HDCAM can take place.

BTW, I provided a link above in the post you replied to: it already leads directly to Black Magic Design's product webpage, which would be a valid answer to the OP's question.