i'm currently trying to setup an Android Emulator for WhatsApp bridging with my Matrix-Server. I followed the instructions here up to the point where i have to setup a webcam for the QR-Scanning: https://docs.mau.fi/bridges/go/whatsapp/android-vm-setup.html


I'm trying to loopback my Desktop screen with the following command

 ffmpeg -s 1024x600  -f x11grab -i :1+10,20 -vf format=pix_fmts=yuv420p -f v4l2 /dev/video0

Afterwards i'm checking the video signal with

mplayer tv:// -tv driver=v4l2:device=/dev/video0

But all i can see is a black window. Somehow this does not seem to work.


I have installed the kernel module using

sudo dnf install v4l2loopback

and loaded the module with

sudo modprobe v4l2loopback

The VM guest is a fedora 33, which runs in a proxmox hypervisor v6.4-13.

is that in general possible to do in a VM guest? Am i doing something wrong?

1 Answer 1


I think I found an answer on the ArchLinux Forum. It seems that the X11 plugin for ffmpeg does not work with Wayland.

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