Script to split a youtube video audio file into separate tracks

file-split.py

#!/bin/env python3

import sys
import re
import subprocess

TRACK_LINE_RE = re.compile(r'^(?P<time>(?:\d+:)?\d+:\d+) Track (?P<idx>\d+)-(?P<title>.*)$')

def time_to_seconds(time):
    time_spec = [1, 1 * 60, 1 * 60 * 60]
    time_parts = [int(i) for i in time.split(':')[::-1]]

    return sum(i[0] * i[1] for i in zip(time_parts, time_spec))

if __name__ == '__main__':
    import sys

    cue_fn = sys.argv[1]
    audio_fn = sys.argv[2]

    with open(cue_fn) as cue_f:
        tracks = [TRACK_LINE_RE.match(cue_line.strip()).groupdict() for cue_line in cue_f if cue_line.strip()]

        for i, track in enumerate(tracks):
            print(track)
            time = time_to_seconds(track['time'])
            idx = int(track['idx'])
            title = track['title']

            out_fn = u'{idx:02d} - {title}.flac'.format(idx=idx, title=title)

            if i+1 == len(tracks):
                subprocess.call(
                    ['ffmpeg', '-ss', str(time), '-i', audio_fn,
                        out_fn],
                    stdout=sys.stdout)
            else:
                subprocess.call(
                    ['ffmpeg', '-ss', str(time), '-i', audio_fn,
                        '-t', str(time_to_seconds(tracks[i+1]['time']) - time),
                        out_fn],
                    stdout=sys.stdout)