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Alpha not recognized in PR4444

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Oliver Peters
Alpha not recognized in PR4444
on Jul 4, 2015 at 4:18:40 pm

I've run into this issue with ProRes4444 source files inside FCP X. The file in question has mixed alpha conditions. The first segment in the file is a reference composite of animation over video. This is followed by the animation clean. This pattern is repeated for a series of animation clips.

The files was exported from the client's FCP X (all clips as primary storyline clips, not connected). When I preview the file using QuickLook, I can clearly see that the sections of just the animation have an alpha. But when I try to key these as a connected clip over video in FCP X, it does not recognize that there is an alpha there and I can't change it in the info pane.

The client re-exported only the animations without the reference composites and these keyed fine and FCP X recognized that there was an alpha in the file.

My guess is that if your file is mixed, like the first export, FCP X won't recognize the alpha, because the first clip in the file doesn't have an embedded alpha. I presume this is a bug. Thoughts?

- Oliver

Oliver Peters Post Production Services, LLC
Orlando, FL
http://www.oliverpeters.com


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Jeremy Garchow
Re: Alpha not recognized in PR4444
on Jul 4, 2015 at 5:50:11 pm

See here. It seems to be a bug, there is a workaround;

https://forums.creativecow.net/thread/344/36774


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Jeremy Garchow
Re: Alpha not recognized in PR4444
on Sep 6, 2015 at 7:21:50 am

Looks like this was fixed in 10.2.2


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