Tue May 21, 2019 11:24 am
Hey Matt,
This is more of a Renewed Vision question (I would check out the ProPresenter's User Group on FB or contact their support if it's a super difficult question as they have the best customer service from experience).
However, since I've obviously done both of that, I know the answer. With the Ultrastudio Mini Monitor you can do a luma key (a single SDI channel) and the ATEM can use the same signal for both key and fill, but you won't be able to do shadows or anything with grey or black in it.
The Alpha Key module needs a BMD device that supports dual-link SDI (A and B channels for key and fill) so the Mini Monitor will not work.
Harry Parker is slightly correct in that that's how the channels work, but ProPresenter is an EXTREMELY powerful piece of software and the Alpha Module actually handles direct SDI output of both channels key and fill. This also means you are not capturing a screen, but rather a direct SDI feed (so that no mice can interrupt your output)
There is another way to do it using a Sonnet Echo Express SEI (which is how we do it) so we can slot in our own Decklink Card via Thunderbolt 2 or 3 (get the correct model for your mac). This means from ProPresenter we can do a 12G 4K60 FPS key with the DeckLink 4K Extreme 12G or Decklink 8K Pro, both of which support dual-link SDI. The other option is the Ultrastudio Extreme 3 or the HD Mini.
Ian