A few things.
Prores 4444 VS Prores 422.
I’ve keyed Prores 422 HQ footage all day long without any trouble. The footage I downloaded said it was Prores 4444. If that is the case, converting 422 to 4444 won’t help you at all. It will just make your file a lot bigger. Think of it like pouring a 8oz can of coke into a gallon of milk jug. You still have 8oz of coke at the end of the day. Putting it into a bigger container won’t help.
Noise
The thing you are really battling is noise. This is the noisest clip I’ve ever tried to key….and I’ve worked with some noising footage in the past. What camera did you use? Speaking of that, was it filmed in ProRes 422 or did you convert it to 422? I prefer to work with the RAW footage or color grade it in Resolve and then key it. That being said, if you really want to solve this problem you will have to reduce the amount of noise it has. I have the Pro version of Resolve and use that. There are a few Noise Reduction plug-ins for AE. Such as Neat video: https://www.neatvideo.com/ or Red Gian DeNoiser: https://www.redgiant.com/products/magic-bullet-denoiser/
Solution
I reduced the noise in DaVince Resolve and then exported out the clip and keyed it. It made a big difference. Here is a sample for you to look at. Please keep in mind it isn’t perfect and there is still “buzzing” in his hair but it is minimal. https://vimeo.com/289335221/45202ead67 One thing to help flickering hair is the “Key Cleaner” effect that comes with After Effects.
Best of luck with your project.
Stephen Smith
Utah Video Productions
Check out my Vimeo page
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