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HDMI 2.0 Quad output card - Barco
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Blackmagic Design DeckLink Quad HDMI Recorder – Thomann United States
A-Neuvideo 16x1 HDMI Quad Screen Multiviewer and ANI-16-MV B&H
4x1 HDMI Quad Multiviewer w/ Seamless Switcher w/ Single HDMI Output | A-NeuVideo, Inc.