logo

Live Production Software Forums

www.vmix.com

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

Notification

Icon
Error
Greenscreen over NDI
Options
Go to last post Go to first unread
Previous Topic Next Topic
lael  
#1 Posted : Sunday, October 22, 2017 12:43:24 AM(UTC)
lael

Rank: Advanced Member

Groups: Registered
Joined: 2/18/2017(UTC)
Posts: 75

Thanks: 22 times
Was thanked: 4 time(s) in 4 post(s)

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?
Back to top

Wanna join the discussion?! Login to your vMix Forums forum account, or Register a new forum account.
Back to top  
Ittaidv  
#2 Posted : Sunday, October 22, 2017 3:45:53 AM(UTC)
Ittaidv

Rank: Advanced Member

Groups: Registered
Joined: 12/19/2013(UTC)
Posts: 600
Man
Belgium
Location: Belgium

Thanks: 75 times
Was thanked: 91 time(s) in 75 post(s)
Use vmix to do the keying, than send over NDI with alpha?
Back to top
WWW BLOG
lael  
#3 Posted : Sunday, October 22, 2017 6:37:06 PM(UTC)
lael

Rank: Advanced Member

Groups: Registered
Joined: 2/18/2017(UTC)
Posts: 75

Thanks: 22 times
Was thanked: 4 time(s) in 4 post(s)
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?
Back to top
kane  
#4 Posted : Sunday, October 22, 2017 9:38:56 PM(UTC)
kane

Rank: Advanced Member

Groups: Registered
Joined: 3/24/2016(UTC)
Posts: 331
Location: Chicago, IL

Was thanked: 143 time(s) in 94 post(s)
It might help post a picture of what you are seeing and what the original source looks like.

Kane Peterson
NewTek
Back to top
WWW
DWAM  
#5 Posted : Monday, October 23, 2017 6:22:10 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 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
Back to top
WWW
thanks 1 user thanked DWAM for this useful post.
mjgraves on 10/27/2017(UTC)
lael  
#6 Posted : Sunday, December 3, 2017 1:58:53 AM(UTC)
lael

Rank: Advanced Member

Groups: Registered
Joined: 2/18/2017(UTC)
Posts: 75

Thanks: 22 times
Was thanked: 4 time(s) in 4 post(s)
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.
Back to top
thanks 1 user thanked lael for this useful post.
rowby on 1/7/2018(UTC)
Users browsing this topic
Guest
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.

Privacy Policy | Powered by YAF.NET | YAF.NET © 2003-2024, Yet Another Forum.NET
This page was generated in 0.127 seconds.