#!/usr/bin/env python

import os
import os.path
import time
import tempfile

from glob import glob

ONE_HOUR = 60 * 60

files = [f for f in glob('*.MP4') if os.path.isfile(f)]
files.sort(key=os.path.getmtime)

current_file_index = 0
file = None

def next_file():
    global file

    if file is not None:
        file.flush()
        join_videos()
        file.close()

    file = tempfile.NamedTemporaryFile()

def join_videos():
    global current_file_index, file

    if file.tell() > 0:
        current_file_index += 1
        os.system("ffmpeg -f concat -safe 0 -i '%s' -c copy %i.mp4" % (file.name, current_file_index))


last = 0
for filepath in files:
    mtime = os.path.getmtime(filepath)

    if (mtime - last) > ONE_HOUR/2:
        next_file()

    last = mtime

    file.write("file '%s'\n" % os.path.join(os.getcwd(), filepath))

next_file()