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I would like to join some videoconference, but I don't own a webcam and the conference software requires one.

So my question is, can I create a dummy one? I don't care what the cam will cast, I just need to appear to have one.

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There is loopback device for that:

https://github.com/umlaeute/v4l2loopback

Just add device with modprobe and stream to it with ffmpeg or gstreamer whatever video you want, or anything else for that matter: https://github.com/umlaeute/v4l2loopback/wiki

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