Split a music track into specified sub-tracks using ffmpeg

split.py

#!/usr/bin/env python3

'''
Description: split a music track into specified sub-tracks using ffmpeg
             target files are saved as variable bit-rate mp3 (lossless)

Usage: split <original_track> <track_list>
'''

import shlex
import subprocess
import sys 


def main():
    # check command line for original file and track list file
    if len(sys.argv) != 3:
        print("usage: split <original_track> <track_list>")
        exit(1)

    # record command line args
    original_track = sys.argv[1]
    track_list = sys.argv[2]

    # create a template of the ffmpeg call in advance
    cmd_string = 'ffmpeg -i {tr} -vn -sn -acodec libmp3lame -q:a 2 -ss {st} -to {en} {nm}.mp3'

    # read each line of the track list and split into start, end, name
    with open(track_list, 'r') as f:
        for line in f:
            # skip comment and empty lines
            if line.startswith('#') or len(line) <= 1:
                continue

            # create command string for a given track
            start, end, name = line.strip().split(maxsplit=2)
            command = cmd_string.format(tr=shlex.quote(original_track), st=start, en=end,
                                        nm=shlex.quote(name))

            # use subprocess to execute the command in the shell
            subprocess.call(command, shell=True)

    return None


if __name__ == '__main__':
    main()

Sample track list file.

00:00:00 00:03:38 01. Another One Bites the Dust
00:03:38 00:09:37 02. Bohemian Rhapsody
00:09:37 00:12:22 03. Crazy Little Thing Called Love
00:12:22 00:16:04 04. Don t Stop Me Now
00:16:04 00:19:52 05. I Want to Break Free
00:19:52 00:22:54 06. Killer Queen
00:22:54 00:28:46 07. Radio Ga Ga
00:28:46 00:33:45 08. Somebody to Love
00:33:45 00:35:51 09. We Will Rock You
00:35:51 00:38:54 10. We Are the Champions