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Greenscreen over NDI
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lael  
#1 Posted : Sunday, October 22, 2017 12:43:24 AM(UTC)
lael

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We are using a scoring app that has scores in regions of the screen, with the rest of the screen as a ChromaKey (Green) so the scoring can be used as an overlay over a live video feed. We are finding that there seems to be square areas around the scoring sections that are not correctly being filled in by the live image(IE - there are patches of green to make a rectangle around the title block, scoring blocks). The scoring and title blocks both use rounded corners.

I was using Newtek Scan converter for capturing the window (not the whole desktop) on the scoring computer and passing over NDI (wireless) to the vmix machine and a Nikon D500 -HDMI-Connect Spark over ethernet for the NDI live video stream.

Any thoughts / suggestions for a fix?
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Ittaidv  
#2 Posted : Sunday, October 22, 2017 3:45:53 AM(UTC)
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Use vmix to do the keying, than send over NDI with alpha?
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lael  
#3 Posted : Sunday, October 22, 2017 6:37:06 PM(UTC)
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I'm not sure I completey understand the question - but I selected the green for the chromakey using the eyedropper sample tool, and Vmix is doing the mixing. What do you mean by send with alpha, is that an NDI setting that I'm unaware of?
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kane  
#4 Posted : Sunday, October 22, 2017 9:38:56 PM(UTC)
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It might help post a picture of what you are seeing and what the original source looks like.

Kane Peterson
NewTek
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DWAM  
#5 Posted : Monday, October 23, 2017 6:22:10 AM(UTC)
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Don't use wireless for NDI
Don't use compressed signals like H.264, go for 4:2:2
Capture fullscreen and don't do upscaling

Guillaume
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mjgraves on 10/27/2017(UTC)
lael  
#6 Posted : Sunday, December 3, 2017 1:58:53 AM(UTC)
lael

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Ok, was playing around with this again yesterday - used NDI to screen capture a fullscreen greenscreen overlay, then run chroma key on it. After altering anti-aliasing and auto chroma key settings it worked perfectly. Really nice outcome. Thanks vMix! Simple and effective.
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thanks 1 user thanked lael for this useful post.
rowby on 1/7/2018(UTC)
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