from subprocess import call, Popen, PIPE
from os import listdir
from re import match
from sys import argv



def getCmdStdErr(command):
    process = Popen(command, stderr=PIPE, stdout=PIPE)
    out, err = process.communicate()
    return err

def getDuration(ffprobe_output):
    durationPattern = r'.*Duration:\s(.+),\sstart.*'
    regex = match(durationPattern, str(ffprobe_output))
    duration = regex.groups()[0] if regex else None
    if not duration:
        raise ValueError('Cannot process ffprobe output!')
    return duration


argv.append('https://coub.com/view/aeeuu')

AUDIO_FILE = 'audio'
VIDEO_FILE = 'video'
URL = argv[1] if len(argv) > 0 else ''  # youtube-dl error message will be shown if ''

call(('/usr/bin/env', 'youtube-dl', '--extract-audio',
                                    '--output',         '{}.%(ext)s'.format(AUDIO_FILE),
                                    URL))
call(('/usr/bin/env', 'youtube-dl', '--output',         '{}.%(ext)s'.format(VIDEO_FILE),
                                    URL))

for file in listdir():
    if match('^{}.*'.format(AUDIO_FILE), file):
        AUDIO_FILE = file
    if match('^{}.*'.format(VIDEO_FILE), file):
        VIDEO_FILE = file

audioLen = getDuration(getCmdStdErr(('/usr/bin/env', 'ffprobe', AUDIO_FILE)))
videoLen = getDuration(getCmdStdErr(('/usr/bin/env', 'ffprobe', VIDEO_FILE)))

print(audioLen)
print(videoLen)