Output the duration for an M4A

get_m4a_duration.py

#!/usr/local/bin/python

import sys
from mutagen.mp4 import MP4

m4a_file = sys.argv[1]

m4a = MP4(m4a_file)

length_secs = m4a.info.length

hours = int(length_secs / 60 / 60)
minutes = int(length_secs / 60) - hours * 60
seconds = int(length_secs - minutes * 60 - hours * 3600)

print("{:02}:{:02}:{:02}".format(hours,minutes,seconds))