#!/bin/bash

# should be run through output pipe, exit otherwise
[ -t 1 ] && echo "ERROR: should declare output as a pipe, ie > output.mp4" && exit -1

# detect current dir
DIR=$(pwd)

# build temporary file which contains all the files to append 
tempfile=$(mktemp)
for i in $@; do
	echo file $DIR/$i >> $tempfile
done

# output as matroska file
ffmpeg -safe 0 -f concat -i $tempfile -c copy -f matroska -