#!/bin/bash

export DISPLAY=:0

ffplay -f v4l2 -framerate 30 -video_size 640x480 \
  -vf "scale=1024:600" -i /dev/video0 -fs -x 1024 -y 600 &
PID=$!
echo "$PID" > /tmp/ffplay.pid

sleep 1

WIN_ID=$(xdotool search --pid $PID --name "ffplay")

wmctrl -i -r "$WIN_ID" -b add,fullscreen,above

wait $PID