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You can avoid a separate, dedicated hardware encoder by looping your own signal back: connect one SDI output of a Blackmagic capture device into the SDI input of the same device, and let OBS encode it and stream it to dfine.io. All you need is a capture device with two SDI outputs and one SDI input. While editing, you can share your screen and feed the SDI reference output to your clients at the same time.
These steps apply to both dfine.io products that livestream — Streaming Classic and Review. The encoder setup is the same; only where you copy your ingest URL and stream key differs by product. See Where do I find the ingest server URL?.
For our own setup we used a Blackmagic UltraStudio 4K to loop the SDI signal back and capture it in OBS.

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Tested devices

  • Blackmagic UltraStudio HD/4K Mini
  • Blackmagic UltraStudio 4K Extreme
  • Blackmagic Decklink 8K Pro
  • Blackmagic Decklink 4K Extreme 12G
  • Blackmagic Decklink Quad
Blackmagic capture device used to loop the SDI signal back

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Set it up

1

Create a scene

In OBS, use the + button at the lower left to add a new scene and give it a name.
Creating a new scene in OBS
2

Add the source

Add a new source on the right side. We use a Blackmagic Device and give it a name.
Adding a Blackmagic device source in OBS
3

Configure the source

Double click the source, set it up as shown and save.
Configuring the Blackmagic device source in OBS

Next: enter your ingest URL and stream key

Add your connection details in OBS and go live.