Download JWPlayer .ts files, merge them into a single file and then convert the file to .mp4

jwplayer_downloader.py

"""
Update URL/Filename, execute script and provide output filename as parameter

Requirements:
  * Python 3.x
  * "ffmpeg" command-line tool.
"""
import sys
import urllib.request
from os import system, remove

out_file_name = sys.argv[1]

# in this case the video files were padded with zeroes
url = 'https://XXX.net/attachments/7960231920314/dff65975fdc647ca87638a355a9344d6/original/Lesson+04/hls/hls_1080p_{0:05d}.ts'
file_name = 'hls_1080p_{0:05d}.ts'
file_names = []

i = 0
while True:
    curr_file_name = file_name.format(i)
    curr_url = url.format(i)
    file_names += [curr_file_name]
    print('Downloading {}'.format(curr_url))
    try:
        urllib.request.urlretrieve(curr_url, curr_file_name)
        i = i+1
    except:
        file_names.pop()
        break

print('All files downloaded')
print('Joining into a single .ts file...')


command = ''

for file_name in file_names:
    command += '{} '.format(file_name)

command = 'cat ' + command + '> {}'.format(out_file_name + '.ts')

system(command)

system('ffmpeg -i {}.ts -acodec copy -vcodec copy {}.mp4'.format(out_file_name, out_file_name))
print('Clenaing up...')

for file_name in file_names:
    remove(file_name)

remove('{}.ts'.format(out_file_name))

print('Done!')