Create fake webcam for Raspberry Pi (3B+ tested)

fake-webcam

#!/usr/bin/env sh

# REQUIRES BUILDING+INSTALLING THIS FIRST:
# https://github.com/umlaeute/v4l2loopback#install

NUM=${2:-0}
PIC=${1:-/usr/share/plymouth/themes/pix/splash.png}

if [ ! -r "$PIC" ]
then
    echo "ERROR: '$PIC' is not a file."
    exit 1
fi

case "$NUM" in
    ''|*[!0-9]*)
        echo "ERROR: '$NUM' is not a number."
        exit 1 ;;
esac

DEV="/dev/video$NUM"
if [ -e "$DEV" ]
then
    echo "ERROR: device '$NUM' exists."
    exit 1
fi

trap ' ' INT  # Capture ffmpeg interrupt
sudo modprobe v4l2loopback exclusive_caps=1 video_nr="$NUM" card_label="Fake Webcam $NUM"
echo "INFO: Created fake webcam at '$DEV' using '$PIC'."
ffmpeg -hide_banner -loglevel warning -stream_loop -1 -re -i "$PIC" -f v4l2 -vcodec rawvideo -pix_fmt yuv420p "$DEV"
sudo modprobe -r v4l2loopback