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virtual greenscreen

Mastering Virtual Greenscreen with OBS and Microsoft Teams

Crafting the Perfect Stream Through OBS Using Creative Backgrounds 

As exciting as it is to stream or record your content with OBS (Open Broadcaster Software), it can be even better with other participants in the video stream which can be done by using a green screen. In my last blog post, I talked about ways to share your content through OBS using a virtual camera.

In this blog post, I expand on my previous blog to show adding a virtual green screen and including additional participants with NDI® (Network Device Interface) sources. I am running the Windows Microsoft Teams app version (64-bit). 

Enable NDI 

For this tutorial, I will be using Microsoft Teams; however, other software programs (such as Skype) also have NDI support. First, you need to get Microsoft Teams enabled for your user by an admin. It is important to note that only the person who will be running OBS will need this enabled. Other users on the call interact with Teams as they would in a normal call. 

After NDI has been enabled for your user, you will need to enable NDI within your Team’s settings. 

Enable NDI in Microsoft Teams

Install NDI Plugin for OBS 

Download the latest NDI plugin for OBS. Next, run the installer. After the installation is complete, you should see an additional NDI Source in the list of sources that you can add to OBS. For now, note the presence of the option. We will make use of it later. 

NDI Source in list of sources for OBS

Start a Teams Call 

Next, join a Teams call and enable NDI broadcasting. Click on the ellipsis (three dots; More actions button) and select Broadcast over NDI. Teams will notify participants that broadcasting capabilities have been turned on.  

Broadcast over NDI in Teams

Importantly, you will need to do this each time you join a Teams call if you wish to access the NDI streams from Teams within OBS. 

Set Teams Background 

Teams recommends that you use a background with “an aspect ratio of 16:9 and a resolution of at least 1920 x 1080”. Here is a sample image that can be used for the background. 

Sample image of green screen for Teams

Alternatively, you can create your own green screen image by opening an image editor and setting the image size to 1920 x 1080. Typically, the green screen color is RGB (8,255,8) or in Hex (#08FF08). Set this as your background image. Also, you will need to turn on your camera in Teams. If there are other participants in the meeting that you would like to include in your OBS scene, ask them to set it as their background image too. In the end, your video in Teams should look something like this. 

Using a green screen in Teams

Add the NDI Source to OBS 

Back in OBS, you are now ready to set up your scene. For this, I will use a simple background image (just adding a new Image Source) and place my video stream on top of it. Using the NDI™ Source menu item that we identified earlier, create a new NDI source and give it a friendly name. 

Creating a new NDI source

Under the Source name, you should see several NDI Streams from the Teams call (you will need at least one other person in the call before the dropdown is populated). To get your own video stream, simply select the one that ends in “(MS Teams – (Local)).” Once you see the preview, start press OK. My final configuration looks like this. 

Final configuration using NDI in Teams

Repeat this process for any additional participants that you want to include in your OBS scene. 

Add Chroma Key to the NDI Source 

Finally, we need to remove the virtual green screen. To do this, right-click on the NDI Source and select Filters. 

Selecting Filters within NDI

In the lower Effects Filters section, add a new Chroma Key filter. For mine, I simply used the default name of “Chroma Key.”  

Adding new Chroma Key filter in lower Effects Filters

Since we are using a fixed image, the default settings should properly remove the green screen background. 

Remove green screen

Repeat this process for any additional NDI sources that you added for other participants. 

The result will be that you have NDI video source within OBS that you can then arrange to your preference, for a nice, professional look. 

Professional look using an NDI video source within OBS

You’re Ready to Stream with a Green Screen

That’s all there is to it. Now, you can gain a virtual green screen using Microsoft Teams to perform the background subtraction. Remember to re-enable NDI broadcasting each time you join a Teams call to see the NDI Sources within Teams. Then, you can combine this technique with my previous blog post to host several participants.   

Have Suggestions?

What other setups would you like to use in your presentations? Let me know in the comments below.  

*A big thank you to James Milholland for inspiring this idea and sitting around on Teams calls with me. 

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