Adding chapter marks works
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0:00:00.000 Intro
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0:01:00.000 First Minute
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0:02:10.000 Two Minutes and ten seconds
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0:02:20.420 Two Minutes and twenty seconds, and then some
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#!/usr/bin/env python3
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import sys
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import os
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import subprocess
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import mutagen
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from mutagen.id3 import ID3, CTOC, CHAP, TIT2, CTOCFlags
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def time_to_milliseconds(time_str):
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time_parts = list(map(lambda t: float(t), time_str.split(':')))
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time = 0
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for part in time_parts[:-1]:
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time = part + time * 60
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time = int((time_parts[-1] + time) * 1000)
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return time
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def read_chapter_file(chapter_file):
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chapters = []
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if not os.path.isfile(chapter_file):
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raise RuntimeError("Chapter file %s does not exist" % chapter_file)
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for line in open(chapter_file, "r"):
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line = line.strip()
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if line != "":
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time, name = line.split(maxsplit=1)
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chapters += [(time, name)]
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return chapters
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def make_mp3_chapters(chapters, audio):
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file_length = int(audio.info.length * 1000)
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element_ids = [(u"ch%d" % i) for i in range(0, len(chapters))]
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audio.tags.add(CTOC(element_id = u"toc",
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flags = CTOCFlags.TOP_LEVEL | CTOCFlags.ORDERED,
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child_element_ids = element_ids,
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sub_frames = [
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TIT2(text = [u"TOC"]),
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]))
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for i in range(0, len(chapters)):
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start_time, name = chapters[i]
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start_time = time_to_milliseconds(start_time)
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end_time = file_length - 1
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if i < len(chapters) - 1:
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end_time = time_to_milliseconds(chapters[i+1][0])
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audio.tags.add(CHAP(element_id = u"chp%d" % i, start_time = start_time, end_time = end_time,
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sub_frames = [
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TIT2(text = [name]),
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]))
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def make_mp4_chapters(chapters, path):
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chap_path = "%s.chapters.txt" % os.path.splitext(path)[0]
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chapter_file = open(chap_path, 'w')
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lines = [u"%s %s\n" % (start_time, name) for start_time, name in chapters]
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chapter_file.writelines(lines)
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chapter_file.close()
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popen = subprocess.Popen(["mp4chaps", "-i", path])
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popen.wait()
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os.remove(chap_path)
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def make_ogg_chapters(chapters, audio):
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for i in range(0, len(chapters)):
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num = str(i).zfill(3)
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audio.tags['CHAPTER%s' % num] = chapters[i][0]
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audio.tags['CHAPTER%sNAME' % num] = chapters[i][1]
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def main():
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if len(sys.argv) < 3:
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print("Usage: %s chapterfile mediafile1 mediafile2 mediafile3 ..." % sys.argv[0])
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sys.exit(0)
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chapter_file_path = sys.argv[1]
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media_files = sys.argv[1:]
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chapters = read_chapter_file(chapter_file_path)
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for path in media_files:
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print("Adding chapters to: %s" % path)
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audio = mutagen.File(path)
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if isinstance(audio, mutagen.mp3.MP3):
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make_mp3_chapters(chapters, audio)
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audio.save()
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elif isinstance(audio, mutagen.mp4.MP4):
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make_mp4_chapters(chapters, path)
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elif isinstance(audio, mutagen.oggvorbis.OggVorbis) or isinstance(audio, mutagen.oggopus.OggOpus):
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make_ogg_chapters(chapters, audio)
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audio.save()
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else:
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print("Skipping unsupported file: %s" % path)
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if __name__ == '__main__':
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main()
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