Just a handy and pretty simple Python script to extract MP3 audio files from videos.

Requirements

The script just requires the following two libraries:

• lame
• ffmpeg

If the libraries are not installed just run the following command in your terminal:
– On Mac (OS X): brew install lame ffmpeg
– On Linux (Ubuntu): sudo apt-get install lame ffmpeg

How to use it

Just run the following command within your terminal replacing NAME_OF_THE_VIDEO.mp4 by the name of your video file:
python video_to_mp3.py NAME_OF_THE_VIDEO.mp4

Note.- The video must be located within the same directory of the python script, otherwise you must provide the full path.

The Script

#!/usr/bin/env python3
"""
video_to_mp3.py

Description:
Simple script to extract MP3 audio from videos using Python.

Requirements:
 - "lame"
 - "ffmpeg"

If the libraries are not installed just run the following command in your terminal:
- On Mac(OS X): brew install lame ffmpeg
- On Linux(Ubuntu): sudo apt-get install lame ffmpeg

How to use the script:
Just run the following command within your terminal replacing "NAME_OF_THE_VIDEO.mp4" by the name of your video file:
$ python video_to_mp3.py NAME_OF_THE_VIDEO.mp4

Note.- The video must be within the same directory of the python script, otherwise provide the full path.
"""
import sys
import os
import time


def video_to_mp3(file_name):
    """ Transforms video file into a MP3 file """
    try:
        file, extension = os.path.splitext(file_name)
        # Convert video into .wav file
        os.system('ffmpeg -i {file}{ext} {file}.wav'.format(file=file, ext=extension))
        # Convert .wav into final .mp3 file
        os.system('lame {file}.wav {file}.mp3'.format(file=file))
        os.remove('{}.wav'.format(file))  # Deletes the .wav file
        print('"{}" successfully converted into MP3!'.format(file_name))
    except OSError as err:
        print(err.reason)
        exit(1)


def main():
    # Confirm the script is called with the required params
    if len(sys.argv) != 2:
        print('Usage: python video_to_mp3.py FILE_NAME')
        exit(1)

    file_path = sys.argv[1]
    try:
        if not os.path.exists(file_path):
            print('file "{}" not found!'.format(file_path))
            exit(1)

    except OSError as err:
        print(err.reason)
        exit(1)

    video_to_mp3(file_path)
    time.sleep(1)


if __name__ == '__main__':
    main()