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It struck once more! The Blackmagic/FCPX 'gotcha' that I swore I'd never be caught by again. Why doesn't the selected output work with Final Cut Pro X?

Yes I did swear, because I had the idea for writing the article the last time that it happened- and then it has happened again! So hopefully this article is a way of me getting this gotcha into my brain so I don't waste time wondering why my monitoring isn't looking the way it should.

What am I talking about? The broadcast output format selector when you configure the Blackmagic Desktop Video app to work with Final Cut Pro X.

If you only use the monitoring of your computer or headphones, then you might not come across this problem. However, if you need a broadcast output from your Mac via a Blackmagic I/O box or card, then this might seem very familiar.

To get a signal through the broadcast output of Final Cut Pro X, you have to have the A/V Output toggled on.

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If you look in the FCPX Playback preferences, it will tell you the signal format that FCPX will send out of the I/O box. This normally feeds a broadcast monitor for example or connects you into a larger  system via an HD-SDI matrix.

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Here you can see in FCPX that it's set to the default 720x486 setting from the Blackmagic Desktop Video app. 

No problem, open up the Blackmagic Desktop Video app settings in System Preferences and toggle to the required format. Here we have gone for 1080p at 25 frames a second.

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Once saved, we get graphic confirmation that the Blackmagic box should be outputting 1080p.

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All good so far... Actually no. You can restart FCPX and your Mac as much as you like, it will carry on outputting 720x486.

This is the gotcha! To change the format of the output, there is a further dedicated Final Cut Pro X output setting in the Blackmagic Desktop video app.

Just scroll down until you find it.

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Once you have that set, restart FCPX and the correct format should be available in the Preferences. Toggle the AV Output on and away you go.

Until the next time you forget that extra preference is there! 

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