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justin commented on a discussion.From BMD note:
Can I ingest and playout at the same time with the Quad?
The DeckLink Quad is basically four DeckLink SDI devices on a single card sharing a genlock. DeckLink
devices are half duplex, they can capture or render, however they cannot do both operations
simultaneously. Therefore on a Quad card, you could do 4 x capture OR 4 x playback, or
combinations such as 2 x capture and 2 x playback etc.March 2014
justin commented on a discussion.More information - appears that Decklink Quad only has 4 framebuffers, so you can only do two full-duplex channels, in other words, 2 in and 2 out independently.
However I think maybe Millumin is querying the card for inputs and so automatically grabs all four as inputs, then the outputs are unavailable.March 2014