Creates an m3u playlist from files downloaded using youtube-dl

yt-playlist.py

#!/usr/bin/env python3
# creates an m3u playlist sorted by upload date and then name for videos
#   downloaded using youtube-dl (with the --write-info-json option)
# written in 2015 by Daniel Oaks <daniel@danieloaks.net>
# released under the CC0 Public Domain license
import os
import json

from natsort import natsorted

playlist_files = []

# sort by upload date and then name
date_files = {}

for dirpath, dirnames, filenames in os.walk(os.getcwd()):
    full_filenames = [name for name in filenames if name.endswith('.json')]

    for name in full_filenames:
        info = json.loads(open(name).read())

        date = info['upload_date']

        if date not in date_files:
            date_files[date] = {}

        date_files[date][name.replace('.info.json', '.ext')] = info

# export names
for date in sorted(date_files.keys()):
    files = date_files[date]

    for name in natsorted(files.keys()):
        info = files[name]

        for ext in ('mp4', 'mkv', 'flv'):
            filename = name.replace('.ext', '.{}'.format(ext))
            if os.path.exists(filename):
                playlist_files.append(filename)
                break

# write out playlist file
with open('playlist.m3u', 'w') as f:
    f.write('\n'.join(playlist_files))
    f.write('\n')