Script that downloads all items in an m3u playlist and merges the resulting files with ffpmpeg. Useful for downloading songs from SoundCloud, etc.

m3u_to_mp3.py

#!/usr/bin/env python3
# Author: Sean Pesce

"""
This script downloads all items in an m3u playlist and merges the resulting files with ffpmpeg. Useful for downloading
songs from SoundCloud, etc.

This script makes a lot of assumptions, and I've only used it for SoundCloud. I can't guarantee it will work with any
other website.

Note that SoundCloud playlists expire within a few minutes, so you should run this script immediately after downloading
the m3u file.

This script requires ffmpeg to be installed on the system.
"""

import os
import sys
import time
import urllib.request


def m3u_get_urls(m3u_fpath):
    with open(m3u_fpath, 'r') as f:
        lines = f.readlines()
    urls = []
    for l in lines:
        if l.startswith('http'):
            urls.append(l.strip('\r\n'))
    return urls


def m3u_to_mp3(m3u_fpath, out_fpath):
    urls = m3u_get_urls(m3u_fpath)
    ffmpeg_cmd = 'ffmpeg -i "concat:'
    for i in range(0, len(urls)):
        print(f'Downloading part {i+1} of {len(urls)}')
        urllib.request.urlretrieve(urls[i], f'{i}.mp3')
        time.sleep(1)
        ffmpeg_cmd += f'{i}.mp3|'
    ffmpeg_cmd = ffmpeg_cmd[:-1]  # Trim trailing pipe character
    ffmpeg_cmd += f'" -acodec copy "{out_fpath}"'
    print(f'\n{ffmpeg_cmd}\n')
    retcode = os.system(ffmpeg_cmd)
    print('Cleaning up temporary files...')
    for i in range(0, len(urls)):
        os.remove(f'{i}.mp3')
    return retcode


if __name__ == '__main__':
    if len(sys.argv) < 3:
        print(f'Usage:\n  {sys.argv[0]} <m3u input file> <mp3 output file>')
        exit()
    M3U_FPATH = sys.argv[1]
    MP3_FPATH = sys.argv[2]
    RETCODE = m3u_to_mp3(M3U_FPATH, MP3_FPATH)