The DeckLink SDK only accepts 4:2:2 or RGB so there has to be some conversion in OBS. I wonder why that is causing issues when you use 709, 4:4:4 or RGB in OBS. I think currently the DeckLink output also only uses RGB if the keyer mode is enabled.
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Mh that's unfortunate but I can't really tell you why that happens. Colin is the main guy for DeckLink stuff so if he can reproduce what you're seeing he might be able to nail it down. With my shuttle I may still be able to figure out the 709/601 issue though.
We've used the Decklink extreme with K/F on a few shows, and it while it renders in RGB, the colorspace is still wonky. Depending on your final destination (hardware), sometimes 601 partial gets you the most accurate colors. Regardless, RIP 444 either way
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Yeah I think the colorspace is just never set so blackmagic's SDK defaults to 601. Not sure why RGB is doing so poorly though.
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I don't understand the encoding lag at all on 709/RGB. I don't see increased CPU or GPU usage, my hardware is strong enough (i9-7900X + RTX 2080) and it's only 1080p25 (my capture card on other PC doesn't accept 4:4:4 above 1080p30).
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