A Python script to obtain chapter titles and timestamps from a media file (uses ffprobe)

getChapters.py

import json, argparse, subprocess

parser = argparse.ArgumentParser()
parser.add_argument('file')
args = parser.parse_args()

output = subprocess.run(["ffprobe", "-print_format", "json", "-show_chapters", "-sexagesimal", args.file], capture_output=True)
print(output)
data = json.loads(output.stdout)

for chapter in data['chapters']:
    start_time, milliseconds = chapter['start_time'].split('.')
    print(f"{start_time} {chapter['tags']['title']}")