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Optical flow not working / all I get is a green screen

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John cade
Optical flow not working / all I get is a green screen
on Jan 19, 2009 at 2:55:12 pm

Hi there folks,

I'm trying to use optical flow in Motiopn 3 to slow shots down to 50%, but every time I try, nothing happens, I just get the little spinny symbol thing (technical I know) and it doesn't give me an estimated time, it just sticks at the first frame. the footage is HDV and I've imported it at 25fps using ProRes 442 (SQ). To further impound the problem, even when I export clip from motion at 50% speed using only blending I'm faced with a green screen when I try and get it into the Final Cut timeline. I'm working on a pretty decent Quad:

2 x 2.66 Ghz Dual-Core
7 GB memory
+ plenty of HD space

Does anybody out there have any idea what's going wrong? Or have any ideas as to a decent workflow when using ProRes?

Cheers
John


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Noah Kadner
Re: Optical flow not working / all I get is a green screen
on Jan 19, 2009 at 4:03:45 pm

Try a different codec to see if that's the issue. Also remember optical flow analyzes the entire piece of media, not just your in/out points. So if it's a long clip, trim and re-export first.

Noah

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John cade
Re: Optical flow not working / all I get is a green screen
on Jan 19, 2009 at 5:01:55 pm

Thanks for that. Didn't realize it did the whole clip. Problem solved



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