V4L2-to-NDI
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Multiple USB video devices - "No space left on device"
So been testing this today and ran into a problem that's not v4l2ndi's fault but something to be aware of with multiple USB video interfaces.
https://stackoverflow.com/questions/11394712/libv4l2-error-turning-on-stream-no-space-left-on-device
Sums up the issue and moving devices over multiple root hubs worked for me.