coub-dl/coub-dl.py

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from subprocess import call, Popen, PIPE, check_output, DEVNULL
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from os import listdir, remove
from os.path import splitext, exists, join
from re import match
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from enum import Enum
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from datetime import timedelta
from math import floor
from argparse import ArgumentParser
from functools import wraps
from tempfile import TemporaryDirectory
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class Stream(Enum):
AUDIO = 1
VIDEO = 2
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class File(Enum):
LIST = 1
LOOP = 2
FRACTION = 3
OUTPUT = 4
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def call_verbose(before_message='', after_message='Done!'):
def tag(f):
@wraps(f)
def wrapper(*args, **kwargs):
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print_opt(before_message, end='', flush=True)
f(*args, **kwargs)
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print_opt(after_message)
return wrapper
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return tag
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def print_opt(*args, **kwargs):
if VERBOSE:
print(*args, **kwargs)
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def get_command_stderr(command):
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process = Popen(command, stderr=PIPE, stdout=PIPE)
out, err = process.communicate()
return err
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def get_duration(ffprobe_output):
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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
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@call_verbose(before_message='Downloading audio stream... ')
def download_audio_stream(url, file_dict):
call(('youtube-dl', '--ignore-config',
'--extract-audio',
'--output', '{}.%(ext)s'.format(file_dict[Stream.AUDIO]),
url),
stdout=DEVNULL, stderr=DEVNULL)
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@call_verbose(before_message='Downloading video stream... ')
def download_video_stream(url, file_dict):
call(('youtube-dl', '--ignore-config',
'--output', '{}.%(ext)s'.format(file_dict[Stream.VIDEO]),
url),
stdout=DEVNULL, stderr=DEVNULL)
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def read_extensions(file_dict, directory):
for file in listdir(directory):
for filename in file_dict:
fullname = join(directory, file)
if match('^{}.*'.format(file_dict[filename]), fullname):
file_dict[filename] = fullname
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@call_verbose(before_message='Looping shorter stream... ')
def loop_shorter_stream(file_dict, shorter, shorter_file, loop_fraction):
# prepare last fractional loop
call(('ffmpeg', '-i', shorter_file, '-t', str(loop_fraction * shorter.total_seconds()), file_dict[File.FRACTION]),
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stdout=DEVNULL, stderr=DEVNULL)
# concat them
call(('ffmpeg', '-f', 'concat', '-safe', '0', '-i', file_dict[File.LIST],
'-c', 'copy', file_dict[File.LOOP]),
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stdout=DEVNULL, stderr=DEVNULL)
@call_verbose(before_message='Muxing streams... ')
def mux_streams(file_dict):
call(('ffmpeg', '-i', file_dict[File.LOOP],
'-i', file_dict[Stream.AUDIO],
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'-map', '0:v:0', '-map', '1:a:0',
'-c', 'copy', file_dict[File.OUTPUT]),
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stdout=DEVNULL, stderr=DEVNULL)
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def get_length(file):
data = get_duration(get_command_stderr(('ffprobe', file))).split(':')
return timedelta(hours=float(data[0]), minutes=float(data[1]), seconds=float(data[2]))
def determine_output_filename(url, user_supplied, extension, files_dict):
if user_supplied is None:
files_dict[File.OUTPUT] = check_output(('youtube-dl', '--get-title', url)).decode('utf-8').strip()
else:
files_dict[File.OUTPUT] = user_supplied
files_dict[File.OUTPUT] += extension
def parse_cmd_arguments():
parser = ArgumentParser(description='Download player-looped videos with youtube-dl & ffmpeg.')
parser.add_argument('-nv', '--nonverbose', action='store_true', help='Turn off non-critical messages to user.')
parser.add_argument('-o', '--output', default=None, help='Specify name of the output file (use -e for extension).')
parser.add_argument('-e', '--extension', default='mp4', help='Set the container to use for the output.')
parser.add_argument('url', type=str, help='The URL of the site containing the video to download.')
args = parser.parse_args()
args.extension = '.' + args.extension
return args
def yes_no_question(question, default):
valid = {"yes": True, "y": True, "ye": True,
"no": False, "n": False}
if default is None:
prompt = " [y/n] "
elif default == "yes":
prompt = " [Y/n] "
elif default == "no":
prompt = " [y/N] "
else:
raise ValueError("Invalid default answer: {}!".format(default))
while True:
print(question + prompt)
choice = input().lower()
if default is not None and choice == '':
return valid[default]
elif choice in valid:
return valid[choice]
else:
print("Please respond with 'yes'(y) or 'no'(n)!")
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def run(url, files_dict, directory):
# download streams and update FILE dict with extensions
download_audio_stream(url, files_dict)
download_video_stream(url, files_dict)
read_extensions(files_dict, directory)
# get stream lengths via ffprobe
audioLen = get_length(files_dict[Stream.AUDIO])
videoLen = get_length(files_dict[Stream.VIDEO])
# decide which stream needs some looping
longer = audioLen if audioLen > videoLen else videoLen
shorter = audioLen if audioLen < videoLen else videoLen
shorterFile = files_dict[Stream.AUDIO] if audioLen < videoLen else files_dict[Stream.VIDEO]
files_dict[File.LOOP] += splitext(shorterFile)[1]
files_dict[File.FRACTION] += splitext(shorterFile)[1]
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times = longer.total_seconds() / shorter.total_seconds()
timesLoop_base = floor(times)
timesLoop_fraction = times % 1
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# write concat helper file for ffmpeg
with open(files_dict[File.LIST], 'w') as f:
for i in range(timesLoop_base):
print("file '{}'".format(shorterFile), file=f)
print("file '{}'".format(files_dict[File.FRACTION]), file=f)
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loop_shorter_stream(files_dict, shorter, shorterFile, timesLoop_fraction)
mux_streams(files_dict)
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if __name__ == '__main__':
args = parse_cmd_arguments()
VERBOSE = False if args.nonverbose else True
FILES = {Stream.AUDIO: 'audio', Stream.VIDEO: 'video',
File.LIST: 'list.txt', File.LOOP: 'loop', File.FRACTION: 'fraction',
File.OUTPUT: 'output'+args.extension}
OUTPUT_KEYS = [File.OUTPUT]
URL = args.url
determine_output_filename(URL, args.output, args.extension, FILES)
# ask what to do if output exists
if exists(FILES[File.OUTPUT]):
answer = yes_no_question('A file named "{}" already exists! Overwrite?'.format(FILES[File.OUTPUT]),
default='no')
if not answer:
print_opt('Exiting!')
exit()
else:
remove(FILES[File.OUTPUT])
with TemporaryDirectory() as dir:
# update temporary file locations in FILES dict
for key in FILES:
if key not in OUTPUT_KEYS:
FILES[key] = join(dir, FILES[key])
run(URL, FILES, dir)