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"Mirabox 4K 60FPS Game Capture Card,USB3.1 Type C HDMI Capture Card,1080P 60FPS HD Audio Video Capture Device for PS4 Switch OBS YouTube Streaming and Recording,Compatible with Windows Mac OS Linux"
Mirabox 4K 60FPS Game Capture Card,USB3.1 Type C HDMI Capture Card,1080P 60FPS HD Audio Video Capture Device for PS4 Switch OBS YouTube Streaming and Recording,Compatible with Windows Mac OS Linux
【4K@60Hz HDMI Input and Passthrough, 1080P 60FPS HD Video Capture with Strong Compatibility】The HDMI capture card has a strong compatibility,it can support to capture 1080P with 60FPS HD video and it can be compatible with all 1080P 720P hdmi device, such as Wii U, PS4, PS3, Xbox One, Xbox 360, Wii,Switch, DVD, camera, ZOSI security camera, DSLR and set top box etc.
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Computers & Accessories
Computer Components
Internal Components
Internal TV Tuner & Capture Cards
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1 comment of this product found across Reddit:
That's no problem. You can use any camera with an HDMI out as a webcam with a USB capture card (for example, something like this).
The D3400 has a mini HDMI out, so you can use that. You should be aware though that the HDMI out might have a little bit of lag. Although since I don't own that model I can't tell you specifics.
edit:
Searching "nikon d3400 hdmi live view" on YT gives a few examples. Maybe that can help as well.