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