Concat GoPro media files

concat.py

import glob
import os
import sys


def escape(path):
    return path.replace(" ", "\ ")


def extract_episode_and_sequence(path):
    _, tail = os.path.split(path)
    seq, ep = tail[:4], tail[4:8]
    return ep, seq


def group_by_episode(pairs):
    group = {}
    for ep, seq in pairs:
        group.setdefault(ep, [])
        group[ep].append(seq)
    return group


if __name__ == "__main__":
    path = sys.argv[1]
    if os.path.isdir(path):
        dirname = path
    else:
        dirname = os.path.dirname(path)
    paths = glob.glob(f"{dirname}/*.MP4")

    pairs = [extract_episode_and_sequence(p) for p in paths]
    group = group_by_episode(pairs)

    for episode in group:
        sequences = group[episode]

        if len(sequences) > 1:
            prefix = sequences[0][:2]
            command = f"ffmpeg -f concat -safe -0 -i <(for f in {escape(dirname)}/{prefix}??{episode}.MP4; do echo \"file '$f'\"; done) -c copy {escape(dirname)}/{prefix}00{episode}.mp4"

            print(command)