Utility to extract the audio from a video file.

extract_audio.py

#!/usr/bin/env python
import argparse
from os import path, system

# specify the location of your ffmpeg binary
ffmpeg = "/home/mohh/anaconda3/pkgs/ffmpeg-4.0-h04d0a96_0/bin/ffmpeg"


def parser():
    """Argument parser"""
    prog = __file__.rsplit("/", 1)[1]
    parser = argparse.ArgumentParser(
        prog=prog, description="Utility to extract the audio from a video file."
    )
    parser.add_argument("filename", help="name of the source video file")
    parser.add_argument(
        "-e",
        "--ext",
        default=".m4a",
        help="extension of the audio file, defaults to .m4a",
        required=False,
    )

    return vars(parser.parse_args())


def extract(filename, ext=".m4a"):
    """Extracts the audio track from the video file"""
    ext = "." + ext if "." not in ext else ext
    og_ext = "." + filename.rsplit(".")[-1]
    output = filename.replace(og_ext, ext)
    if verify(filename):
        cmd = '{0} -i "{1}" -vn -acodec copy "{2}"'.format(ffmpeg, filename, output)
        system(cmd)
        print("\n  Successfully extracted: {}\n".format(output))
    else:
        print("The video file '{}' does not exists!".format(filename))
        exit(1)


def verify(filename):
    """Verifies that the file exists"""
    return path.isfile(filename)


def main():
    """Runs the code if started as a script"""
    params = parser()
    filename = params.get("filename")
    ext = params.get("ext")
    extract(filename, ext)


if __name__ == "__main__":
    main()