I have a Micomsoft sc-512n1-l/dvi capture card and I'm trying to use the "CUSTOM H.ACTIVE" feature to increase the horizontal sampling for 288P content.
But no matter what I do, horizontal sampling stays locked at 720 pixels. See the screenshot below, where I've set the number of horizontal pixels to 1280 with no effect:
Has anyone else come across this? It'd be great to tweak this sampling rate up so I can capture unusually wide content properly - like Atari ST medium resolution (640x200 pixels).