concatenate_mp3.py

#!/usr/local/bin/python3
import glob
import subprocess
import argparse

parser=argparse.ArgumentParser()
parser.add_argument('out_file', type=str, help='the output audio file', default='out.mp3')
args = parser.parse_args()
args = args.__dict__

files=glob.glob("*.mp3")
if not files:
    print('No input files detected. Will exit.')
    exit(1)

files.sort()
files_str = '|'.join(files)
files_arg = 'concat:{}'.format(files_str)

cmd = 'ffmpeg -i "{}" -acodec copy {}'.format(files_arg, args['out_file'])
print(cmd)
result = subprocess.run(cmd, shell=True)
print('done')