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Re:Waydroid – Run Android containers on Ubuntu by exikyut on Wednesday September 22, 2021 @12:06PM (#28618021)
FWIW/out of curiosity, I just tried poking the emulator that comes with Android Studio, and found an option (under "advanced settings") to route the emulated front or back camera to "Webcam0". This is out of the box on Debian.

While definitely a heavyweight approach (yay, installing all of Android Studio - but you also install an update tool), I can confirm it works. (And you can fish out and save the qemu invocation from `ps axfww`, then launch it directly without needing to start anything else, although I think the idiomatic approach is using the `emulator` command.)

Re:Waydroid – Run Android containers on Ubuntu by zorr on Wednesday September 22, 2021 @12:57PM (#28618711)
The emulator is part of the android SDK so you don't need to install the full IDE if all you need is the emulator. You can just install the Android SDK standalone and use that to install additional images and start/stop devices.