mp4_to_mp3.py

'''
Takes a folder and converts all .mp4 files in it to .mp3. 
It saves the mp3 files to the same directory using the original name but with an .mp3 extension. 

Based on: 
https://www.tutorialexample.com/a-complete-guide-to-python-convert-mp4-to-mp3-with-moviepy-python-tutorial/

Pre-requisites: 
  Python 3.7
  pip install moviepy
'''

import glob
import os
from moviepy.editor import *

folder = r'E:'

for mp4 in glob.glob(os.path.join(folder, '*.mp4')):
    mp3 = mp4.replace('.mp4', '.mp3')
    videoclip = VideoFileClip(mp4)
    audioclip = videoclip.audio
    audioclip.write_audiofile(mp3)
    audioclip.close()
    videoclip.close()