#!/bin/sh

parts=( )

if [ $# -lt 5 ]; then
	printf "usage: %s input output [start duration [start duration ...]]\n" $0 2>&1
	exit 1
fi

input=$1
output=$2
shift
shift

while [ "x$1" != "x" -a "x$2" != "x" ]
do
	tmp=`mktemp --tmpdir=. --suffix=.mpg`
	start=$1
	echo $tmp
	ffmpeg -y -i "$input" -sameq -ss "$1" -t "$2" "$tmp"

	parts=( $parts $tmp )

	shift
	shift
done

ffmpeg -y -i concat:$(printf "|%s" "${parts[@]}" | sed 's/^|//') -vcodec copy -acodec copy "$output"