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Integrating Viz Flowics with vMix through SDI
Integrating Viz Flowics with vMix through SDI
Updated over a week ago

With Viz Flowics you can output on vMix, graphics through a SDI workflow.

In this article we will show you an step by step guide and some requirements to complete this integration. Before continue with this process you may want to learn the advantages of using SDI clicking here.


  1. Having installed vMix. Download it from

  2. Selected Blackmagic cards are supported

    • Decklink 4K Extreme / Extreme 12G / Pro

    • Decklink Duo 2 / Quad 2 (see additional configuration steps below)

    • UltraStudio 4K / 4K Extreme / 4K Extreme 3 / HD Mini
      Find the card configuration, hardware and software requirements clicking here.

  3. Flowics output URL

Configuration for Duo 2 / Quad 2

When using the Decklink Duo 2 or the Decklink Quad 2, port 1 will need to be configured in the Blackmagic Desktop Video Utility to group together SDI ports 1 and 2 as shown below:

External Output Configuration

When selecting a supported device in External Output settings in vMix, an Alpha Channel dropdown box will appear as shown below:

None: No alpha channel, send the video output to the device as normal.

Straight: Output two channels over the device, Key + Fill on separate SDI ports. (This is also known as Linear)

Premultiplied: Same as Straight except the Fill channel will be "Premultiplied" check with the receiving device documentation to determine which of these options should be selected.

After configuring the external Output, on the vMix main screen you must Activate the External Output by clicking on the External button, when activated it will change color to Red.

If you use the Blackmagic ATEM (Live production switcher) then check the following info

Blackmagic ATEM Configuration

The Key + Fill outputs will be sent over SDI 1 and SDI 2 (or SDI A / SDI B) respectively. These can then be connected to two spare inputs on an ATEM switcher.
From the ATEM switcher control panel keyer settings, these two inputs can be selected as Key and Fill to complete the process

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