Forgive me if I'm stupid, which is highly possible, but if you have to a framemeister that outputs to HDMI and that's digital I think?
Oh, that's not a stupid question but, unfortunately, it does not work.
I thought this too as my second DF project ever WAS Zone of the Enders 2 HD back in 2013. I thought I could just capture PS2 from a Framemeister and analyse it but I didn't yet understand the limitations of our software. Now I get it.
The only reason digital signal helps is that, well, it eliminates image noise and produce a reliably clean picture.
Analog cables introduce noise into the image - sometimes minor enough that you can't even see it by eye. To analyse this footage, we have a "compression" flag that can be used along with a number defining the tolerance. This basically overlooks minor image flaws in order to try and pick out unique frames. Analog imagery, without this flag, just comes up as 60fps because analog noise refreshes at that rate and changes the image just enough that it believes there is a new frame being displayed.
The compression feature overcomes this BUT it also makes it nearly impossible to pick-up torn frames since the tear detection algorithm is no longer able to determine where the image is breaking. So analog + tearing = no way.
The ONLY workaround here would be to manually go through the footage, frame by frame, and add a tear line for each torn frame. That would, of course, take hours. No thanks!