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Computer: AMD 3960X Threadripper, 64 Ram, Windows 10 Pro/Aida PTZ NDI/HX cameras/Meraki MX67 router/Meraki Ms120 switch/vMix 4K Two problems: (1) I cannot record without getting stutters in the video. Every few minutes it will freeze or jump. Looks like the CPU can't keep up or something. I'm recording to mp4 @ 4Mbps. (2) I cannot get a good green screen. I have done plenty of green screen work so I know to have the screen away from the subject (I have it at least 6' away) and well lit, but I cannot get away from getting green along the edges. Especially if the guy has a bald head. Aliasing is bad too but it doesn't work to turn anti aliasing up past medium. I pick the green screen color, hit preset 2, then adjust until right before I get red line around subject.  IT_Lindell.jpg (830kb) downloaded 5 time(s).
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Rank: Newbie
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FYI, during recording, I also recorded on my DSLR just as a backup (thankfully). I brought the video from the DSLR into vMix and the green screen works perfectly! Really nice job. Now to figure out how to get it right revording in vMix.
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Don't expect to get a good green screen from such a highly compressed NDI|HX signal and such a poor camera.
If you are picky about quality, use SDI and a real cam with at least 4:2:2 sub sampling
Your recording issue is very likely to be caused by the same reason. I wouldn't use NDI|HX for real video production, to me it's just good for security cameras...
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I would look at Intel / Nvidia for a VMix system. Look at the reference systems. Lits of people seem to have issues with Rizen chips.
You are also getting lots of bleed on your green screen. I would recommend masking unused parts, lighting separately, and keeping at least 15-20 feet distance between talent and screen.
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Joined: 10/10/2023(UTC) Posts: 8  Thanks: 3 times
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Originally Posted by: Lewie1999  Computer: AMD 3960X Threadripper, 64 Ram, Windows 10 Pro/Aida PTZ NDI/HX cameras/Meraki MX67 router/Meraki Ms120 switch/vMix 4K Two problems: (1) I cannot record without getting stutters in the video. Every few minutes it will freeze or jump. Looks like the CPU can't keep up or something. I'm recording to mp4 @ 4Mbps. (2) I cannot get a good green screen. I have done plenty of green screen work so I know to have the screen away from the subject (I have it at least 6' away) and well lit, but I cannot get away from getting green along the edges. Especially if the guy has a bald head. Aliasing is bad too but it doesn't work to turn anti aliasing up past medium. I pick the green screen color, hit preset 2, then adjust until right before I get red line around subject. IT_Lindell.jpg (830kb) downloaded 5 time(s). Hi Lewie Did you ever resolve this issue? I'm building a Threadripper 3960x vMix machine, so have been looking through the forum, to see if people had issues with a 3960x CPU. Thanks
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Rank: Newbie
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Joined: 6/11/2020(UTC) Posts: 6 Location: NC
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Yes, I did. Had to experiment with the green screen setting a bit, but it works great now. Never is a problem. And the jitters in the recording is gone. This was so long ago, I cannot remember what I did to rectify it, but it's not a problem. I do know I no longer record the individual cameras separately (I use three) and that may have solved it, but I'm not sure.
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