#!/bin/sh
set -e

usage() {
	echo "usage: tomp4 <files>"
	exit 1
}

[ -z "$1" ] && usage

for arg in "$@"; do
	case "$arg" in
		*.mkv ) 
			if [ ! -f "$arg" ]; then
				echo "$arg is not a file"
				usage
			fi ;;
		*) echo "$arg is not a .mkv file"; usage ;;
	esac
done

for input in "$@"; do
	base=${input%.mkv}
	output="$base.mp4"
	tmp="$base.tmp.mp4"

	if [ ! -f "$output" ]; then
		ffmpeg -i "$input" "$tmp"

		if [ $? -ne 0 ]; then
			rm "$tmp"
			exit 1
		fi

		mv "$tmp" "$output"
	else
		"Skipping $input"
	fi
done