Play multiple files synchronised in VLC

mvlc.sh

#!/usr/bin/env bash

VLC='/usr/bin/vlc --sout-all --sout #display'

joinargs () {
  local IFS="#"
  echo "$*"
}

multivlc () {
  FIRST="$1"
  shift
  OTHERS=$(joinargs "$@")
  $VLC "$FIRST" :input-slave="$OTHERS" :file-caching=500
}

if [[ $# -le 1 ]]; then
  $VLC "$@"
else
  multivlc "$@"
fi