Your upscaling regime is a recipe for disaster.
Will something like a Blackmagic Intensity USB 3 capture 4x3 and not stretch it (End result is I need to be able to record it to the computer in the original aspect ratio and am happy to invest in gear If I know it will work)We are getting there. I am trying to capture SD and happy for it to stay at SD (Just the converters I have wont allow that). The tape is a standard VCR playing in an old LG player with AV out, I don't know what the source was shot on as they are all just old documentaries. I am trying to capture 4x3 vision similar to that at the link below