#!/bin/bash
extract_mp4_to_png()
{
	local bname="$(basename $1)"
	local dname="${bname%.*}"
	if [ -d "$dname" ]; then
		echo "directory ($dname) already exists..."
		return
	fi
	mkdir -p "$dname"
	ffmpeg -i "$bname" -r 1 -f image2 "${dname}/%03d.png"
}

extract_mp4_to_png "$1"