#!/usr/bin/env bash
# docstring=open the webcam or v4l2 /dev/video* device
set -E -o pipefail
shopt -s failglob
export LC_ALL=C.UTF8

if [[ "-h" == "$1" ]]; then
  echo "-l list devices"
  exit 0
elif [[ "-l" == "$1" ]]; then
  ls -la /dev/video*
  exit 0
fi

device="/dev/video""${1:-"0"}"
echo ">>> opening: $device"
mpv --panscan=1.0 --no-osc --profile=low-latency --untimed "av://v4l2:$device"