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Color Shift 5 frames in to Rendered Comp
Hey all,
I’ve been compositing a piece done entirely on green screen. I imported my cut from FCP to AE via QT movie to do all the compositing. The settings from Final Cut match the footage, so no further compression other than the DVCPro 720p has occurred.
I don’t believe any of the above contribute to the problem, but just serves as background.
My issue is this… I’ve split out the QT movie into 17 individual shots so I can composite them individually. So I have 17 comps which I will then replace the cuts in FC. After exporting each comp, lossless, animation, millions of colors, I’m seeing a color shift 5 frames into each one. It is not visible in AE.
Has anyone ever heard of this?
Here are 2 screen grabs, you can see the shift if you toggle back and forth.
https://picasaweb.google.com/JMBoucher/AECOLORSHIFT/photo#5192125333670193826
https://picasaweb.google.com/JMBoucher/AECOLORSHIFT/photo#5192125402389670578 -
3 Replies
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Wow…. I’m shocked that no one has any thoughts. Well the problem persists and I’m forced to find creative ways to hide the shift.
greydogcreative.com
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Sounds like you may be having the same problem as me and at least a few others… if you search CC for “multiprocessor render problems” you should find another thread about it. Appears that it’s exactly that… only work around I’ve heard is to not use multiprocessor render (in prefs). I’m theorizing that the number of frames before gamma shift is related to the number of cpus, as my 4 core machine does it 3 frames in while others with 8 cores have reported 14 frames in… Some have said that the problem went away with 8.01 upgrade of AE, but mine persists through the last several QT upgrades and the one AE upgrade. Post here if you find a better answer as I’m rendering hours and hours of footage that really benefits from MP.
J.T.
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I’m glad to see this post. I thought I was the only one having this issue. Nucleo Pro 2 seems to be the only way to do multi-processing without gamma shifts. I’m okay native multi-processing in SD but not in HD. Looks like double Rec 709 gamma. I’m using Kona 3 and v210 codec to go round trip to FCP.
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