Split MP4 on chapters (by using mp4box)
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mp4box = 'C:\Programs\GPAC\MP4Box.exe' | |
def tosec(s): | |
# convert time signature to seconds as float | |
from datetime import datetime | |
dt = datetime.strptime(s, '%H:%M:%S.%f') | |
return dt.hour * 3600 + dt.minute * 60 + dt.second + dt.microsecond * 10e-7 | |
def main(arg): | |
import re, os, time, ctypes | |
from subprocess import check_call, check_output | |
fn = arg[0] | |
if os.path.isfile(fn): | |
folder = os.path.dirname(fn) | |
try: | |
info = check_output([mp4box, "-info", fn]) | |
# extract all chapter time signatures | |
time_fmt = '\d{2}:\d{2}:\d{2}.\d{3}' | |
m = re.findall('Chapter #\d+ - (%s)' % time_fmt, info) | |
if len(m) > 1: | |
m.append(re.search('Duration (%s)' % time_fmt, info).group(1)) | |
# find chapter titles | |
chapters = re.findall('Chapter #\d+ - %s - "(.*?)"' % time_fmt, info) | |
# add default values to chapthers w/o title | |
chapters = ['Chapter %02d' % (x+1) if y == "" else y for (x, y) in enumerate(chapters)] | |
# make convenient filename for each chapter | |
chapters = ['%02d - %s.m4a' % (x+1, ''.join(z for z in y if (z.isalnum() or z in ' _'))) for x, y in enumerate(chapters)] | |
# iterate over each chapter range | |
for z, (x, y) in enumerate(zip(m[0::1], m[1::1])): | |
if len(arg) == 1 or int(arg[1]) == z+1: | |
check_call([mp4box, '-splitx', '%s:%s' % (tosec(x), tosec(y)), | |
fn, '-out', os.path.join(folder, chapters[z])]) | |
check_call([mp4box, '-add', '%s#1' % os.path.join(folder, chapters[z]), | |
'-new', os.path.join(folder, chapters[z])]) | |
# make playlist | |
if len(arg) == 1: | |
with open(fn.replace(os.path.splitext(fn)[1], '.m3u'), 'w') as pls: | |
pls.write('\n'.join(chapters)) | |
pls.close() | |
os.startfile(fn.replace(os.path.splitext(fn)[1], '.m3u'), 'open') | |
else: | |
msg = 'File "%s" doesn\'t contain chapters' % fn | |
except Exception as e: | |
msg = str(e) | |
else: | |
msg = 'File "%s" doesn\'t exist' % fn | |
if 'msg' in vars(): | |
ctypes.windll.user32.MessageBoxA(0, msg, 'MP4Box split', 0) | |
if __name__ == '__main__': | |
import sys | |
if len(sys.argv) > 1: | |
main(sys.argv[1:]) | |
else: | |
print('Usage: python.exe mp4split.py input.m4a [chapter_number]') |
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