Mac users interested in Blackmagic desktop video generally download:
Blackmagic Design's Desktop Video software includes drivers, plug-ins and applications for your UltraStudio, DeckLink or Intensity. You can use Desktop Video software by itself or else work directly within video software from companies including Adobe, Apple and Avid.
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Blackmagic Desktop Video Utility is a video capture and playback tool.
Blackmagic Desktop...Recorder for video capture...for desktop video products