Quick and dirty mp4 file cutting by cue sheet.

split.py

#!/usr/bin/python

"""Quick and dirty mp4 file cutting by cue sheet.

The cue sheet shall look somewhat like this::

    PERFORMER "Calexico & ORF Radio-Symphonieorchester"
    TITLE "FM4 Radiosession mit Calexico"
    FILE "mp4_rs_calexico_final_2_q4a_200152.mp4" MP3
      TRACK 01 AUDIO
        PERFORMER "Calexico"
        TITLE "Intro"
        INDEX 01 00:00:00

Uses MP4Box (http://gpac.wp.mines-telecom.fr/mp4box/) for the cutting. Since the
'-out' argument seems to be ignored with '-splitx' it renames the output files
using 'mv' according to track number, artist and title in the cue sheet.

I did not find a way to cut from a tiem to the end of the file, so you need to
set the total length of your input manually!
"""

cuefile = "mp4_rs_calexico_final_2_q4a_200152.cue"
mp4file = "mp4_rs_calexico_final_2_q4a_200152.mp4"
mp4length = 4250


from subprocess import call

def parse_cuefile(cuefile):
    cue = {'TRACKS': []}

    with open(cuefile, 'r') as fh:
        for line in fh:
            _ = line.strip().split(" ")
            key = _[0]
            values = _[1:]
            #print key, values
            if key in ['PERFORMER', 'TITLE', 'FILE'] and not key in cue.keys():
                cue[key] = " ".join(values).replace('"', '')
                continue
            if key in ['FILE']:
                cue[key] = values[0].replace('"', '')
                cue['TYPE'] = values[1].replace('"', '')
                continue
            if key == 'TRACK':
                tmp = {}
                tmp['TRACK'] = values[0]
                continue
            if key == 'PERFORMER':
                tmp['ARTIST'] = values[0].replace('"', '')
                continue
            if key == 'TITLE':
                tmp['TITLE'] = " ".join(values).replace('"', '')
                continue
            if key == 'INDEX':
                tmp['TSTAMP'] = values[1]
                m, s, _ = values[1].split(":")
                tmp['TSTAMP_SEC'] = int(m)*60+int(s)
                cue['TRACKS'].append(tmp)
                continue
    return cue

def call_mp4box(track, artist, title, start, end, mp4file):
    call('MP4Box -splitx {}:{} {}'.format(start, end, mp4file), shell=True)
    _ = mp4file.split(".")
    out = '{}_{}_{}.{}'.format(''.join(_[:-1]), start, end, _[-1])
    call('mv {} "{} - {} - {}.mp4"'.format(out, track, artist, title), 
        shell=True)

def cut_mp4file(cue, mp4file, length):
    for n in range(0, len(cue['TRACKS'])):
        if n < len(cue['TRACKS'])-1:
            call_mp4box(cue['TRACKS'][n]['TRACK'], cue['TRACKS'][n]['ARTIST'],
                cue['TRACKS'][n]['TITLE'], cue['TRACKS'][n]['TSTAMP_SEC'], 
                cue['TRACKS'][n+1]['TSTAMP_SEC'], mp4file)
        else:
            call_mp4box(cue['TRACKS'][n]['TRACK'], cue['TRACKS'][n]['ARTIST'],
                cue['TRACKS'][n]['TITLE'], cue['TRACKS'][n]['TSTAMP_SEC'], 
                length, mp4file)
                
cut_mp4file(parse_cuefile(cuefile), mp4file, mp4length)