mjpeg 422 chroma key

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pablopmr

New member
Just got a GH13--amazing, 2nd day

Trying tests at present, I am having trouble keying, using mjpeg 422 color, bit rate at 60mb rate.

Is the gh13 delivering 422, I have transcoded mjpeg to prores422 (HQ) that helps a little but there is so much blocking. Keying with keylight AE.

Looked around on forums etc, can not find definitive answer.

Is there something Im not doing right?
 
First of all, how's your greenscreen setup? Do you have a sample stiil or video of what you've shot (with greenscreen showing, not yet keyed-out)? Uniformity of the green background and quality lighting are essential for a great key.
 
Lighting etc is not the problem, all done in a pro studio with even green screen, subject 5 foot in front lit separately.

Done lots of green screen, thought I'd try GH1 due to 4:2:2 color on hack with mjpeg, in a small camera package.

Is it a codec problem? or not true 4:2:2? forums seem to say that gh1 4:2:2 does not produce a good key when using 4:2:2, it should be better than 4:2:0
 
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