How to use OmniScope with UltraStudio 4K Mini and a reference monitor on the same Mac
If you're using the Blackmagic UltraStudio 4K Mini with HDMI out to a reference monitor and OmniScope shows no signal, the fix is a simple SDI loopback cable.
Quick Tip: OmniScope + UltraStudio 4K Mini setup
The Problem
The UltraStudio 4K Mini sends your video over HDMI to the reference monitor, but OmniScope needs an SDI signal to analyze the video. Without an SDI input, OmniScope has nothing to capture.
The Solution
Connect a short SDI cable from the SDI OUT port back into the SDI IN port on the UltraStudio 4K Mini. This creates a loopback that feeds the same video signal back for OmniScope to capture.
Signal Flow
The full signal path looks like this:
Mac sends video over Thunderbolt to the UltraStudio 4K Mini
HDMI OUT goes to the reference monitor (your monitoring stays exactly the same)
SDI OUT loops back into SDI IN via a short SDI cable
OmniScope captures the signal from the SDI input
You're simply adding a parallel path for scopes — your existing monitoring workflow is not affected.
Setup Summary
Connection
From
To
Thunderbolt
Mac
UltraStudio 4K Mini
HDMI
UltraStudio 4K Mini
Reference Monitor
SDI (loopback)
SDI OUT
SDI IN
OmniScope Configuration
Open OmniScope, go to Connect To and select the UltraStudio 4K Mini as your input device.
That one SDI loopback cable is usually the missing piece when OmniScope shows no signal with the UltraStudio 4K Mini.
