Here's an example for reference:
Use a laptop as video input
Use an "HDMI - HDMI" cable to connect the laptop to the video capture card
Connect the video capture card to the Vibe USB or USB-C port
Once connected, turn on your Vibe and go to Settings -> Developers -> Vibe Cast test mode -> Open app
The video input will now be on your Vibe. You can also select video and audio configuration details in the casting window.
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