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AVC Intra and Chroma Key Tip, maybe!

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Jeff Heck
AVC Intra and Chroma Key Tip, maybe!
on Apr 22, 2011 at 1:28:59 pm

Hi. I just shot footage with my Panasonic HPX-370 on a clean green screen. Typically when I use FCP I insert either a 4:1:1 or 4:2:2 color smoothing filter, then do the chroma key, and use either a green or blue color suppressor, depending on green or blue background.

I shot using the AVC Intra codec and have discovered if you use the 4:2:2 filter with this codec, it creates several vertical lines in the finished key. If you do not use the 4:2:2 smoother, all is good. Wondering if it's the codec that doesn't like the filter. I used the 4:1:1 smoother, just for fun, and it's still there.

I guess it's a tip for you all or a question to see if anyone else has had this issue. This is the first shoot with this camera and using the AVC Intra setting.

Jeff Heck
NaJor Productions
Indianapolis


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Rafael Amador
Re: AVC Intra and Chroma Key Tip, maybe!
on Apr 22, 2011 at 1:41:34 pm

Hi Jeff,
Sorry but you are using the Chroma Smooth filters wrongly.
- The 411 and 420 filters are to be applied to 411 or 420 stuff. The filter will work in a 422 or 444 sequence.
- The 422 filter is to be applied to 422 footage and only works in a 444 sequence.

The sequence codec needs to have more chroma samples than the footage so can retain the interpolated (smoothed) chroma.
rafael

http://www.nagavideo.com


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Jeff Heck
Re: AVC Intra and Chroma Key Tip, maybe!
on Apr 22, 2011 at 1:51:50 pm

Thanks Rafael! Makes perfect sense. Don't do a ton of chroma keying and relied on the settings of a friend.

Jeff Heck
NaJor Productions
Indianapolis


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Rafael Amador
Re: AVC Intra and Chroma Key Tip, maybe!
on Apr 22, 2011 at 5:20:54 pm

Hi Jeff,
I haven't used it for CK, but for years the "Nattress Chroma Smooth/Sharpening" has been my "secret weapon" when editing DV footage. Is magic.
Drop the filter it in any DV stuff; render to any 422 codec, and -although won't look like DigiBeta- that won't look like DV anymore.
Cheers,
rafael

http://www.nagavideo.com


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