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Motion to FCP luma change

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Latch Everest
Motion to FCP luma change
on Jan 10, 2008 at 12:31:54 am

I've looked around a bit for an answer to this but I'm not getting much luck. It's probably simple and I'm overlooking something but here's what's happening:

I'm taking HD video from FCP and sending it to Motion. The clip has two people, one of whom has a white blouse. In the video the blouse is already a bit overexposed, but it doesn't look bad. Also (side note), to cut down on render time, I'm cutting a long on-camera piece to only include the thirds I need to add in Motion and leaving the rest of the original clip on the timeline.

When I bring it into motion I add a moving thirds from a video piece composed of a white matte and the main layer to go on top. I have no problems here, put it together, add the text and save it for FCP.

The problem is when I go back to Final Cut the the white blouse has a serious luma change between the original footage and the piece coming from Motion. I can really only notice it in the blouse. And the waveform also does a jump from the original footage to the very next adjacent frame from Motion.

I've looked all around for a reason for this but haven't stumbled across anything so any incite you guys could share I'd really appreciate. I hope I'm not over-complicating the description.

-latch




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Glenn Sakatch
Re: Motion to FCP luma change
on Jan 10, 2008 at 7:51:36 pm

I just did a quick test, and found the same problem, although not as severe as what you are probably seeing. My source shot was not overexposed, but my not have been broadcast safe, and i'll bet thats the problem. Could it be Motion is clipping your shot? Check out your original on a waveform, or in color, and check out your resulting image. I bet Motion is clipping the shot. You may have to try to lower your whites before you spit it to motion.


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Latch Everest
Re: Motion to FCP luma change
on Jan 10, 2008 at 8:25:39 pm

Hey Glenn, thanks for your response.
And yep, that's exactly it, Motion is clipping it. But why?? And how do I prevent it from happening? I don't like the idea of Motion making alterations to my source footage without asking.

Is there a way to control how Motion handles the source footage, aside from preferences?

-latch


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Glenn Sakatch
Re: Motion to FCP luma change
on Jan 10, 2008 at 8:38:01 pm

I wonder if you set motion to 10 bit or 32 bit depth if that would help.


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Latch Everest
Re: Motion to FCP luma change
on Jan 11, 2008 at 8:10:55 pm

I talked to Apple FCP Studio tech support and there's no work-around for this. I think that's pretty shoddy, but you just have to take the footage through Motion's codec however it wants it. Of course the argument could be made that it needs to be broadcast safe before bringing it in anyway, but I still don't like the lack of options. Anywho, thought I'd post this in case anyone else runs into this prob.




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