问如何将多个mp4文件合并为最终mp4中的章节？

EN

import subprocess
import os
import re


def make_chapters_metadata(list_mp4: list):
    print(f"Making metadata source file")

    chapters = {}
    for single_mp4 in list_mp4:
        number = single_mp4.removesuffix(".mp4")
        duration_in_microseconds = int((subprocess.run(f"ffprobe -v quiet -of csv=p=0 -show_entries format=duration {folder}/{single_mp4}", shell=True, capture_output=True).stdout.decode().strip().replace(".", "")))
        chapters[number] = {"duration": duration_in_microseconds}

    chapters["0001"]["start"] = 0
    for n in range(1, len(chapters)):
        chapter = f"{n:04d}"
        next_chapter = f"{n + 1:04d}"
        chapters[chapter]["end"] = chapters[chapter]["start"] + chapters[chapter]["duration"]
        chapters[next_chapter]["start"] = chapters[chapter]["end"] + 1
    last_chapter = f"{len(chapters):04d}"
    chapters[last_chapter]["end"] = chapters[last_chapter]["start"] + chapters[last_chapter]["duration"]

    metadatafile = f"{folder}/combined.metadata.txt"
    with open(metadatafile, "w+") as m:
        m.writelines(";FFMETADATA1\n")
        for chapter in chapters:
            ch_meta = """
[CHAPTER]
TIMEBASE=1/1000000
START={}
END={}
title={}
""".format(chapters[chapter]["start"], chapters[chapter]["end"], chapter)
            m.writelines(ch_meta)


def concatenate_all_to_one_with_chapters():
    print(f"Concatenating list of mp4 to combined.mp4")
    metadatafile = f"{folder}/combined.metadata.txt"
    os.system(f"ffmpeg -hide_banner -loglevel error -y -f concat -i list_mp4.txt -i {metadatafile} -map_metadata 1 combined.mp4")

if __name__ == '__main__':

    folder = "."  # Specify folder where the files 0001.mp4... are

    list_mp4 = [f for f in os.listdir(folder) if re.match(r'[0-9]{4}\.mp4', f)]
    list_mp4.sort()

    # Make the list of mp4 in ffmpeg format
    if os.path.isfile("list_mp4.txt"):
        os.remove("list_mp4.txt")
    for filename_mp4 in list_mp4:
        with open("list_mp4.txt", "a") as f:
            line = f"file '{filename_mp4}'\n"
            f.write(line)

    make_chapters_metadata(list_mp4)
    concatenate_all_to_one_with_chapters()

$ ls
0001.mp4 0002.mp4 0003.mp4 0004.mp4 multiple_mp4_to_single_mp4_with_chapters.py
$ python multiple_mp4_to_single_mp4_with_chapters.py