chapterize_mkv.py

from os import listdir
from os.path import join, isfile
from shlex import quote
import argparse
import subprocess

SH_BREAK = ' \\\n\t'

parser = argparse.ArgumentParser(description='Merge/chapterize discrete MKV files')
parser.add_argument('source_path')
parser.add_argument('output_filename')
parser.add_argument('--title', nargs=1)

args = parser.parse_args()

source_files = sorted([
    f for f in listdir(args.source_path)
    if isfile(join(args.source_path, f))
    and f.endswith('.mkv')
])

mm_args_pre = [
    "--ui-language en_US",
    f"--output '{args.output_filename}'",
    "--default-track 0:yes "
]
if args.title: mm_args_pre.append( f"--title {args.title}" )

mm_args = [
    f"'(' {quote(join(args.source_path, f))} ')'" for f in source_files
]

mm_args_post = [
    "--generate-chapters-name-template '<FILE_NAME>'",
    "--generate-chapters when-appending"
]

cmd = SH_BREAK.join([
    'mkvmerge',
    *mm_args_pre,
    f' {SH_BREAK}+ '.join(mm_args),
    *mm_args_post
])

print('Chapterize command:')
print(cmd)
print('Executing...')
subprocess.run(cmd, shell=True)