[Python] Simple Script that Splits an audio file by it's metadata chapters using ffmpeg. Supports reading chapters from one file and splitting a different one. Useful for audio book conversion. No modules required, only ffmpeg/ffprobe binaries in your PATH

ffmpeg_chaptersplit.py

from subprocess import check_output, call, DEVNULL
from json import loads
from os import makedirs
from os.path import join, exists, splitext
from string import ascii_letters, digits

# if your ffmpeg commands are different, change them here
FFMPEG = "ffmpeg"
FFPROBE = "ffprobe"


# stolen from https://gist.github.com/seanh/93666, thank you very much
def format_filename(s):
    valid_chars = "-_.() %s%s" % (ascii_letters, digits)
    filename = ''.join(c for c in s if c in valid_chars)
    filename = filename.replace(' ','_') # I don't like spaces in filenames.
    return filename


chapterfile = input("File to fetch chapters from: ")
inputfile = input("Input File (leave empty to use chapter-file): ")
if inputfile == "":
    inputfile = chapterfile
outputfolder = input("Folder to write chapters to: ")

print("Checking " + chapterfile + " for chapters...")
chapterinfo = check_output(FFPROBE + " " + chapterfile +  " -show_chapters -of json", shell=True, stderr=DEVNULL)
chapters = loads(chapterinfo)["chapters"]
chapterlen = str(len(chapters) + 1)
print("Found " + chapterlen + " chapters")

if not exists(outputfolder):
    makedirs(outputfolder)

for chapter in chapters:
    chapterid = str(chapter["id"] + 1)
    try:
        title = chapter["tags"]["title"]
    except KeyError:
        print("Chapter " + chapterid + " does not seem to have a title")
        title = chapterid
    print("Slicing chapter " + chapterid + " of " + chapterlen + "...")
    outputfile = join(outputfolder, format_filename(title + splitext(inputfile)[1]))
    start = str(int(float(chapter["start_time"])))
    duration = str(int(start) - int(float(chapter["start_time"])))
    call(FFMPEG + " -ss " + start + " -i " + inputfile + " -t " + duration + " -c copy " + outputfile, shell=True)

print("...Done")