Decklink Duo 2 + ATEM Studio HD Config

General
4

Yes, you do need two channels because you are seeking two independently-controlled video outputs.

Maybe this might help:

<channels>
	<channel>
		<video-mode>1080i5000</video-mode>
		<consumers>
			<decklink>
				<device>1</device>
				<embedded-audio>true</embedded-audio>
				<channel-layout>8ch</channel-layout>
				<keyer>external_separate_device</keyer>
				<key-device>2</key-device>
			</decklink>
		</consumers>
	</channel>
	<channel>
		<video-mode>1080i5000</video-mode>
		<consumers>
			<decklink>
				<device>3</device>
				<embedded-audio>true</embedded-audio>
				<channel-layout>8ch</channel-layout>
			</decklink>
		</consumers>
	</channel>
</channels>

This code block would result in the following on the Decklink Duo 2 backplate:

REF
SDI 1 = CH1 Fill
SDI 3 = CH2
SDI 2 = CH1 Key
SDI 4 = Unused (assignable elsewhere)

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