This guide covers how to set up an Android or iPhone as a webcam using DroidCam on Arch Linux, specifically when using OBS Studio via Flatpak. It includes steps for USB support (iOS/Android), High Definition (1080p), Microphone setup, and using the camera outside of OBS (Zoom, Discord, etc.).
Even though OBS is in a Flatpak, the drivers must be installed on your host Arch system.
You need v4l2loopback to create the virtual camera device.