[…] First thing to do is to convert the analogue signal to hdmi. […]
Why? What’s wrong with directly capturing composite? I have yet to come across an HDMI capture card that doesn’t process the signal in some way (eg no upscaling, no deinterlacing). I’m doing this for archival purposes so I want the signal as unadulterated as possible.
I want to capture interlaced — not progressive [2][1]. I don’t want any deinterlacing done by the capture card [3].
References