Script to stitch together GoPro recordings with FFmpeg

gopro.py

import glob
from collections import defaultdict
import subprocess
from os import path

def main(dest = ''):
  recordings = defaultdict(list)

  for file in glob.glob(f'GH{"[0-9]" * 6}.MP4'):
    chapter = file[2:4]
    recording = file[4:8]

    recordings[recording].append(chapter)

  for recording, chapters in recordings.items():
    cmd = ['ffmpeg']

    for chapter in chapters:
      cmd.extend(['-i', f'GH{chapter}{recording}.MP4'])

    cmd.extend(['-c', 'copy', '-map_metadata', '0', path.join(dest, f'{recording}.MP4')])

    subprocess.run(cmd)

if __name__ == '__main__':
  import sys

  main(sys.argv[1])