CUE splitter using ffmpeg (to mp3)

cue_to_mp3.py

# -*- encoding: utf-8 -*-

import sys
import os.path
import codecs

if len(sys.argv) == 1:
  print "Usage: cue_to_mp3.py <CUE file path> [-o]"
  print "Options:"
  print "    -o, execute and output mp3 file"
  sys.exit(0)

cue_file = sys.argv[1]

output = False
if "-o" in sys.argv:
  output = True

target_dir = os.path.dirname(sys.argv[1])

d = codecs.open(cue_file, 'r', 'utf-8').read().splitlines()
#d = codecs.open(cue_file, 'r', 'shift_jis').read().splitlines()

general = {}
tracks = []
target_file = None

def line2time(line):
  t = map(int, ' '.join(line.strip().split(' ')[2:]).replace('"', '').split(':'))
  return 60 * t[0] + t[1] + t[2] / 100.0

for line in d:
    if line.startswith('REM GENRE '):
        general['genre'] = ' '.join(line.split(' ')[2:])
    if line.startswith('REM DATE '):
        general['date'] = ' '.join(line.split(' ')[2:])
    if line.startswith('PERFORMER '):
        general['artist'] = ' '.join(line.split(' ')[1:]).replace('"', '')
    if line.startswith('TITLE '):
        general['album'] = ' '.join(line.split(' ')[1:]).replace('"', '')
    if line.startswith('FILE '):
        target_file = ' '.join(line.split(' ')[1:-1]).replace('"', '')
    if line.startswith('  TRACK '):
        track = general.copy()
        track['track'] = int(line.strip().split(' ')[1], 10)
        tracks.append(track)
    if line.startswith('    TITLE '):
        tracks[-1]['title'] = ' '.join(line.strip().split(' ')[1:]).replace('"', '')
    if line.startswith('    PERFORMER '):
        tracks[-1]['artist'] = ' '.join(line.strip().split(' ')[1:]).replace('"', '')
    if line.startswith('    INDEX 00 '):
        tracks[-1]['pre_gap'] = line2time(line)
    if line.startswith('    INDEX 01 '):
        tracks[-1]['start'] = line2time(line)

for i in range(len(tracks)):
    if i != len(tracks) - 1:
      if 'pre_gap' not in tracks[i]:
        tracks[i]['duration'] = tracks[i + 1]['start'] - tracks[i]['start']
      else:
        tracks[i]['duration'] = tracks[i + 1]['pre_gap'] - tracks[i]['start']


for track in tracks:
    metadata = {
        'artist': track['artist'],
        'title': track['title'],
        'album': track['album'],
        'track': str(track['track']) + '/' + str(len(tracks))
    }
    if 'genre' in track:
        metadata['genre'] = track['genre']
    if 'date' in track:
        metadata['date'] = track['date']
    cmd = 'ffmpeg'
    cmd += ' -y'
    cmd += ' -i "%s"' % os.path.join(target_dir, target_file)
    cmd += ' -vn'
    cmd += ' -b:a 320k'
    cmd += ' -ss %.2d:%.2d:%.2d' % (track['start'] / 60 / 60, track['start'] / 60 % 60, int(track['start'] % 60))
    if 'duration' in track:
        cmd += ' -t %.2d:%.2d:%.2d' % (track['duration'] / 60 / 60, track['duration'] / 60 % 60, int(track['duration'] % 60))
    cmd += ' ' + ' '.join('-metadata %s="%s"' % (k, v) for (k, v) in metadata.items())
    #cmd += ' "%.2d - %s - %s.mp3"' % (track['track'], track['artist'], track['title'])
    cmd += ' "%s.mp3"' % (track['title'])
    if output:
      import shlex, subprocess
      args = shlex.split(cmd.encode("utf-8"))
      p = subprocess.Popen(args)
      p.wait()
    else:
      print cmd
print u"Done"

This script is modified from bancek/cue_to_mp3.py.

Usage: cue_to_mp3.py <CUE file path> [-o]
    Options:
        -o, execute and output mp3 file

Original script prints command texts for ffmpeg when it executes.
This script executes ffmpeg actual with -o option. (If it is without -o option will dry-run.)

Available charactor codes of cue sheet are UTF8 and SHIFT-JIS. (switch the comment in this script)

(2016/7/24 : Update)
Enable "INDEX 00" for pre gap.

Japanese:

このスクリプトはbancek/cue_to_mp3.pyを改変したものです。

使い方 : cue_to_mp3.py <cueシートファイルパス> [-oオプション]

元のスクリプトはcueシートから実行すべきffmpegのコマンドを表示するものでしたが、
-oオプションを付与すると、このスクリプト内でffmpegの実行を行うようにしました。
(-oオプションがない場合はコマンドの表示のみ)

cueシートの文字コードはUTF8とShift-JISに対応しています。
(スクリプト中のコメントで切り替えてください)

(2016/7/24 : Update)
"INDEX 00"行が示す、プリギャップに対応しました。

Just a heads up. This current script ends tracks slightly short, and starts them a bit earlier. See my comment on the original gist for a solution:

https://gist.github.com/bancek/b37b780292540ed2d17d#gistcomment-3613793

Basically, lines 80 and 82 need to use floats with 2 decimals for the seconds in "-ss" and "-t" parameters to ffmpeg.