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Keying green screen AVCHD footage

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Brock Jolet
Keying green screen AVCHD footage
on Feb 15, 2012 at 6:39:41 am

Can anyone help me find a solution. I am keying green screen footage shot on an AF-100 and encoded as AVCHD.

I have tried both "BCC Chroma Key" and "Keylight" but I am getting jagged edges around the subjects.

It is my understanding that AVCHD encodes in 4:2:0 and this may be why I am having issues. Does anyone have advice on a solution?

The best thing I could come up with is to us a "matte choker" to smooth the edges, then an edge blur to soften them. However, this means I lose small details like hair.

On top of these issues, the footage was shot 1920x1080 and I need to enlarge the final product to 4096x2304 before rendering.

I'm using Adobe After Effects CS5 on OSX Lion. I also have access to CS5.5 if there are any new features that may help.

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Brock Jolet
Re: Keying green screen AVCHD footage
on Feb 16, 2012 at 7:11:44 am

For anyone else encountering this issue, it appears to be a problem with how After Effects interprets footage using interframe compression such as AVCHD. Pulling it into CS5.5 produced better results, but still not optimal.

I converted a sample clip to ProRes 4444 and have received much better results. However, ProRes 4444 results in much higher file sizes, so now I'm pursuing an alternative codec.

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Brandon Cranor
Re: Keying green screen AVCHD footage
on May 15, 2012 at 10:13:32 pm

So is the best thing to up convert footage to ProRes4444 do the edit and then down convert it back to something more manageable?


Mac OS X: 10.6.8
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 8 GB
Bus Speed: 1.33 GHz

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Brock Jolet
Re: Keying green screen AVCHD footage
on May 18, 2012 at 4:25:06 pm

I converted to ProRes 4444, did the effects work, then delivered to the editor. I'm not sure if they continued to work with the 4444 or down converted, but I would imagine they kept the ProRes files.

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