logo

Live Production Software Forums


Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Options
Go to last post Go to first unread
Lewie1999  
#1 Posted : Thursday, June 11, 2020 11:42:25 PM(UTC)
Lewie1999

Rank: Newbie

Groups: Registered
Joined: 6/11/2020(UTC)
Posts: 6
United States
Location: NC

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).
Lewie1999  
#2 Posted : Friday, June 12, 2020 2:13:50 AM(UTC)
Lewie1999

Rank: Newbie

Groups: Registered
Joined: 6/11/2020(UTC)
Posts: 6
United States
Location: NC

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.
DWAM  
#3 Posted : Friday, June 12, 2020 2:24:32 AM(UTC)
DWAM

Rank: Advanced Member

Groups: Registered
Joined: 3/20/2014(UTC)
Posts: 2,721
Man
France
Location: Bordeaux, France

Thanks: 243 times
Was thanked: 794 time(s) in 589 post(s)
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...
Vince Beck  
#4 Posted : Friday, June 12, 2020 6:43:52 AM(UTC)
Vince Beck

Rank: Advanced Member

Groups: Registered
Joined: 7/28/2019(UTC)
Posts: 351
United States
Location: Santa Rosa

Thanks: 1 times
Was thanked: 51 time(s) in 51 post(s)
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.
VeloMedia  
#5 Posted : Monday, February 19, 2024 9:58:08 PM(UTC)
VeloMedia

Rank: Newbie

Groups: Registered
Joined: 10/10/2023(UTC)
Posts: 5
United Kingdom

Originally Posted by: Lewie1999 Go to Quoted Post
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
Lewie1999  
#6 Posted : Monday, February 19, 2024 11:12:28 PM(UTC)
Lewie1999

Rank: Newbie

Groups: Registered
Joined: 6/11/2020(UTC)
Posts: 6
United States
Location: NC

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.
Users browsing this topic
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.