#!/bin/sh
# This is in the public domain.
# written by John-Mark Gurney

timetosec()
{
	sec="${1##*:}"
	rem="${1%:*}"
	if [ x"$rem" = x"" -o x"$1" = x"$sec" ]; then
		hour=0
		min=0
		sec=${sec#0}
	else
		orig="$rem"
		min="${rem##*:}"
		rem="${rem%:*}"
		sec=${sec#0}
		if [ x"$rem" = x"" -o x"$min" = x"$orig" ]; then
			hour=0
		else
			hour="$rem"
		fi

	fi

	echo $(($hour * 60 * 60 + $min * 60 + $sec ))
}

failed()
{
	echo failed
	exit 1
}

if [ x"$1" = x"-t" ]; then
	set -x

	x=$(timetosec 30)
	if [ x"$x" != x"30" ]; then
		failed
	fi

	x=$(timetosec 1:30)
	if [ x"$x" != x"$((60+30))" ]; then
		failed
	fi

	x=$(timetosec 1:01:30)
	if [ x"$x" != x"$((60*60+60+30))" ]; then
		failed
	fi

	exit 0
fi

if [ x"$#" != x"4" ]; then
	echo "Usage: $0 <inp> <start> <stop> <output>"
	exit 1
fi

inp="$1"
start="$2"
end="$3"
out="$4"

startsec=$(timetosec "$start")
endsec=$(timetosec "$end")

ffmpeg -ss "$startsec" -i "$inp" -t $(($endsec - $startsec + 1)) -codec copy "$out"