Building a simple UE5 viewer that switches between three NDI camera feeds

Note: This article is more than one year old.

• Compatibility between UE's NDI receiver and mobile sender apps depends on their versions. Check the release notes for both the plugin and the app.
• Camera permissions, background behavior, and resolution presets on iOS and Android can change with OS updates.
• Check NDI's terms of use and bandwidth requirements for your environment.

In the previous article, I sent three USB camera feeds over the network using NDI. This time, I will build a UE5 viewer that receives those feeds and switches cameras with the number keys.

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Previously: sending three USB camera feeds over the network with NDI

https://riragon.com/blog/en/ubuntu22-04-gstreamer-ndi-sdk-gst-plugin-ndi/

Receiving and displaying NDI video in UE5 (Unreal Engine 5)

https://riragon.com/blog/en/unreal-engine-5-ndi-reception-display-guide/

I opened UE5.2 and made the following project, with four CameraActors and three NDI screens. I had already enabled the NDI plugin. I also created three NDI receiver configurations. I made a Blueprint that switches cameras when a number key is pressed. 0 shows the overview, 1 the left camera, 2 the center camera, and 3 the right camera. The overview is shown initially. The video showed ghosting, so I set the following option to None. I could now switch between the NDI camera feeds like this. It may not be a particularly practical use of UE5. However, an NDIIO error prevented me from exporting the app, and I initially gave up. After about 30 hours of trial and error, I solved it. The following NDIIO error caused BUILD FAILED.

Expecting to find a type to be declared in a module rules named 'NDIIO'... This type must derive from the 'ModuleRules' type defined by Unreal Build Tool
UATHelper: パッケージ化 (Windows): BUILD FAILED

The NDIIO plugin did not seem to be packaging correctly. I moved NDIIO from the UE_5.2 folder into the project. This was a move, not a copy: I did not leave the original folder in place.

C:\Program Files\Epic Games\UE_5.2\Engine\Plugins\NDIIO\

For example, if the UE5.2 project folder is named ndiplayer05:

C:\Users\----\Documents\Unreal Projects\ndiplayer05\

I created a Plugins folder there and moved the entire NDIIO folder into it. The build then succeeded. Moving the plugin allowed it to be recognized.