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multiple inputs, same soure using scripting - a script that "copies" the NDI soure name to another vMix input
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johan.weinl  
#1 Posted : Monday, January 26, 2026 9:27:49 PM(UTC)
johan.weinl

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Location: Stockholm
Hello!

I have a workflow question that might require some scripting knowledge, and I hope someone here can help.

Background / Setup

I have three NDI inputs:

External 1
External 2
External 3

I also have three delayed versions of these inputs:

External 1delay
External 2delay
External 3delay

The delayed inputs use the same sources as the originals, but with added video delay.

Current Workflow

The operator can change the NDI source by:

Right-clicking on an input thumbnail
Selecting a different NDI source

What I Want to Achieve

When the operator changes the source for:
External 1

The same source should automatically be applied to:
External 1delay

The same behavior should apply to:

External 2 ā†’ External 2delay
External 3 ā†’ External 3delay

Limitations

Using additional NDI outputs and feeding them back into the production is not an option, since they are already in use.

My Questions

Is there an alternative workflow that I might have missed?
Or is scripting the only realistic solution?

If scripting is required:

Would anyone with scripting experience be willing to help me get started?
Iā€™m not very experienced with scripting, so any guidance would be greatly appreciated.

Thank you in advance!

Best regards,
Johan
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mavik  
#2 Posted : Monday, January 26, 2026 9:37:14 PM(UTC)
mavik

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I might be missinterpreting your post but from my understanding this could be a solution.
Add three inputs, use the NDI sources in layers (1,2,3,d1,d2,d3). Create a shortcut that move the wanted layer to the top (layer 9). This way you have a matrix what is visible. You can even be more creative and use dynamic values. One for which NDI and a second for delay. A third to take the values into action.
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johan.weinl  
#3 Posted : Monday, January 26, 2026 9:45:28 PM(UTC)
johan.weinl

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Hi Marvik and thank you for the replay!
Unfortunatly it is not really what I wanna achieve here...
I do apologise that my explanation might not have been good enough, i've reposted the question again with the help of some AI to make the text more readable

Best regards
//Johan
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doggy  
#4 Posted : Monday, January 26, 2026 9:55:37 PM(UTC)
doggy

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Originally Posted by: johan.weinl Go to Quoted Post
Hello!
I have workflow that might require some scripting-knowledge from you awesome people here!

Case:
I have three NDI inputs named (external 1,2,3)
I also have three other NDI inputs named (external 1delay, 2delay, 3delay) (basically the same as above, where the difference is that the video is delayd here)


I want it so when the operator changes the ndi source on lets say the externa 1 input (by rightclicking on the thumbnail of that input and selecting the another NDI source), the same NDI source will then be applied to the external 1delay input.



Using NDI outputs and feed back into the production is not an options since they are already in use.

Is there another workflow here that I might have missed, or is scripting the way to go here?
In that case, does anyone with sufficient scripting knowledge have the ability to assis an unknowledgeable scriptingboomer (i.e me) with some help?

Thank you in advance!
//Johan


You could use the SetOutputExternal if only one could retrieve the current input used for the externel but one can not

but why not make it simpler; have just 2 NDI inputs you set to your external and simply change the sources of these NDI inputs with the shortcut function NDISelectSourceByIndex (or Name)
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