#! /bin/sh

if [ -z "$1" ]; then
   echo "Usage: $0 input1 [input2...]"
   exit 1
fi

if [ $# -eq 1 ]; then
   input="$1"
else
   input=concat:"`echo \"$@\" | sed 's/ /|/g'`"
fi

exec ffmpeg -i "$input" -vf cropdetect -an -f rawvideo -y /dev/null