Hello, I am new with vMix.

We have a project in the standard 4kUHD but we want to have 2:1 intentional letterbox for a bit more cinema.

I wonder what would be the easiest and fastest way to put the letterbox over both the output and the preview. I've tried to use overlays with premade letterbox png, it works for the program but not for the preview permanently. And there is a chance of turning them off unintentionally.

Davinci Resolve has an easy quick function called "Output blanking" with different aspect ratios that does exactly this while keeping the output aspect ratio at 16:9. Is there anything similar in vMix?

Thank you.

Hello. Maybe you can do something with layers as any input accepts 10 layers. Or maybe it will be more easier in the up-coming vmix 28 as it supports the overlay channels to be shown also in mix inputs and also flatten layers for better compositing an input in another input. https://forums.vmix.com/...vMix-28-Preview-Released
a video for mix inputs
and
and in these add in Vmix 28 that we are able to send directly an overlay channel

I’ve worked with vMix before, and while there isn't a direct “output blanking” feature like in DaVinci Resolve, you can achieve a similar result using the Wide Screen feature. Here's how:

Go to Settings > Output/NDI Settings and enable the Wide Screen feature.
Set the aspect ratio to 2:1, which will automatically add the letterbox effect to both your output and preview without the need for overlays.
This will ensure the letterbox stays on permanently for both, and you won’t risk accidentally turning it off.