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Unfortunately, if this LG FAQ page is representative of LG’s TVs, they do not allow 480i over HDMI.
That’s what I feared. How bizarre that 480i would be allowed through one signal but not another.
It is absolutely possible to do that, but, considering the equipment you’re looking at, it’s really only beneficial to split the signal if you’re using multiple displays (which you’re not) or if you absolutely need the no-lag processing of the OSSC over the 1-frame processing lag of the Framemeister.
If you can deal with the Framemeister’s processing lag, I think the most economical approach would be to use solely the Framemeister. You’ll just need a passive component->D-Terminal adapter.
If you can’t deal with the Framemeister’s 480p processing (Which I understand is not the best, but not as terrible as people have made it out to be), you could chain the OSSC into the Framemeister’s HDMI input, which should let you do line2x on 480p to 960p, passthrough on 480i, 720p, and 1080i on the OSSC, then have the Framemeister do deinterlacing and scaling to 1080p.
I don’t mind the one-frame of lag that much, though doing without is always great. You’re correct that it’s more about the 480p processing. What happens when you take the OSSC’s 480p signal and put it through the Framemeister? Wouldn’t it come out with the same flaws as any other 480p signal, plus added lag?