#!/bin/bash

for d in "$@"
do
	if [ -d "$d" ]; then
		ffmpeg -y -f concat -safe 0 -i <(for f in $(ls -1 "$d" | grep event-.*\.mp4 | sort -t- -n -k2); do echo "file '$PWD/$d/$f'"; done) -c copy "$d"/../$(basename "$d").mp4
	fi
done