Convert all tabs to 4 spaces (PEP8)

1 files changed, 699 insertions, 699 deletions

diff --git a/youtube_dl/FileDownloader.py b/youtube_dl/FileDownloader.py
index 9e9f2a0e4..9dc3523e0 100644
--- a/youtube_dl/FileDownloader.py
+++ b/youtube_dl/FileDownloader.py
@@ -10,707 +10,707 @@ import sys
 import time
 
 if os.name == 'nt':
-	import ctypes
+    import ctypes
 
 from utils import *
 
 
 class FileDownloader(object):
-	"""File Downloader class.
-
-	File downloader objects are the ones responsible of downloading the
-	actual video file and writing it to disk if the user has requested
-	it, among some other tasks. In most cases there should be one per
-	program. As, given a video URL, the downloader doesn't know how to
-	extract all the needed information, task that InfoExtractors do, it
-	has to pass the URL to one of them.
-
-	For this, file downloader objects have a method that allows
-	InfoExtractors to be registered in a given order. When it is passed
-	a URL, the file downloader handles it to the first InfoExtractor it
-	finds that reports being able to handle it. The InfoExtractor extracts
-	all the information about the video or videos the URL refers to, and
-	asks the FileDownloader to process the video information, possibly
-	downloading the video.
-
-	File downloaders accept a lot of parameters. In order not to saturate
-	the object constructor with arguments, it receives a dictionary of
-	options instead. These options are available through the params
-	attribute for the InfoExtractors to use. The FileDownloader also
-	registers itself as the downloader in charge for the InfoExtractors
-	that are added to it, so this is a "mutual registration".
-
-	Available options:
-
-	username:          Username for authentication purposes.
-	password:          Password for authentication purposes.
-	usenetrc:          Use netrc for authentication instead.
-	quiet:             Do not print messages to stdout.
-	forceurl:          Force printing final URL.
-	forcetitle:        Force printing title.
-	forcethumbnail:    Force printing thumbnail URL.
-	forcedescription:  Force printing description.
-	forcefilename:     Force printing final filename.
-	simulate:          Do not download the video files.
-	format:            Video format code.
-	format_limit:      Highest quality format to try.
-	outtmpl:           Template for output names.
-	restrictfilenames: Do not allow "&" and spaces in file names
-	ignoreerrors:      Do not stop on download errors.
-	ratelimit:         Download speed limit, in bytes/sec.
-	nooverwrites:      Prevent overwriting files.
-	retries:           Number of times to retry for HTTP error 5xx
-	buffersize:        Size of download buffer in bytes.
-	noresizebuffer:    Do not automatically resize the download buffer.
-	continuedl:        Try to continue downloads if possible.
-	noprogress:        Do not print the progress bar.
-	playliststart:     Playlist item to start at.
-	playlistend:       Playlist item to end at.
-	matchtitle:        Download only matching titles.
-	rejecttitle:       Reject downloads for matching titles.
-	logtostderr:       Log messages to stderr instead of stdout.
-	consoletitle:      Display progress in console window's titlebar.
-	nopart:            Do not use temporary .part files.
-	updatetime:        Use the Last-modified header to set output file timestamps.
-	writedescription:  Write the video description to a .description file
-	writeinfojson:     Write the video description to a .info.json file
-	writesubtitles:    Write the video subtitles to a .srt file
-	subtitleslang:     Language of the subtitles to download
-	"""
-
-	params = None
-	_ies = []
-	_pps = []
-	_download_retcode = None
-	_num_downloads = None
-	_screen_file = None
-
-	def __init__(self, params):
-		"""Create a FileDownloader object with the given options."""
-		self._ies = []
-		self._pps = []
-		self._download_retcode = 0
-		self._num_downloads = 0
-		self._screen_file = [sys.stdout, sys.stderr][params.get('logtostderr', False)]
-		self.params = params
-
-		if '%(stitle)s' in self.params['outtmpl']:
-			self.to_stderr(u'WARNING: %(stitle)s is deprecated. Use the %(title)s and the --restrict-filenames flag(which also secures %(uploader)s et al) instead.')
-
-	@staticmethod
-	def format_bytes(bytes):
-		if bytes is None:
-			return 'N/A'
-		if type(bytes) is str:
-			bytes = float(bytes)
-		if bytes == 0.0:
-			exponent = 0
-		else:
-			exponent = int(math.log(bytes, 1024.0))
-		suffix = 'bkMGTPEZY'[exponent]
-		converted = float(bytes) / float(1024 ** exponent)
-		return '%.2f%s' % (converted, suffix)
-
-	@staticmethod
-	def calc_percent(byte_counter, data_len):
-		if data_len is None:
-			return '---.-%'
-		return '%6s' % ('%3.1f%%' % (float(byte_counter) / float(data_len) * 100.0))
-
-	@staticmethod
-	def calc_eta(start, now, total, current):
-		if total is None:
-			return '--:--'
-		dif = now - start
-		if current == 0 or dif < 0.001: # One millisecond
-			return '--:--'
-		rate = float(current) / dif
-		eta = int((float(total) - float(current)) / rate)
-		(eta_mins, eta_secs) = divmod(eta, 60)
-		if eta_mins > 99:
-			return '--:--'
-		return '%02d:%02d' % (eta_mins, eta_secs)
-
-	@staticmethod
-	def calc_speed(start, now, bytes):
-		dif = now - start
-		if bytes == 0 or dif < 0.001: # One millisecond
-			return '%10s' % '---b/s'
-		return '%10s' % ('%s/s' % FileDownloader.format_bytes(float(bytes) / dif))
-
-	@staticmethod
-	def best_block_size(elapsed_time, bytes):
-		new_min = max(bytes / 2.0, 1.0)
-		new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB
-		if elapsed_time < 0.001:
-			return int(new_max)
-		rate = bytes / elapsed_time
-		if rate > new_max:
-			return int(new_max)
-		if rate < new_min:
-			return int(new_min)
-		return int(rate)
-
-	@staticmethod
-	def parse_bytes(bytestr):
-		"""Parse a string indicating a byte quantity into an integer."""
-		matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr)
-		if matchobj is None:
-			return None
-		number = float(matchobj.group(1))
-		multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
-		return int(round(number * multiplier))
-
-	def add_info_extractor(self, ie):
-		"""Add an InfoExtractor object to the end of the list."""
-		self._ies.append(ie)
-		ie.set_downloader(self)
-
-	def add_post_processor(self, pp):
-		"""Add a PostProcessor object to the end of the chain."""
-		self._pps.append(pp)
-		pp.set_downloader(self)
-
-	def to_screen(self, message, skip_eol=False):
-		"""Print message to stdout if not in quiet mode."""
-		assert type(message) == type(u'')
-		if not self.params.get('quiet', False):
-			terminator = [u'\n', u''][skip_eol]
-			output = message + terminator
-			if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr
-				output = output.encode(preferredencoding(), 'ignore')
-			self._screen_file.write(output)
-			self._screen_file.flush()
-
-	def to_stderr(self, message):
-		"""Print message to stderr."""
-		assert type(message) == type(u'')
-		output = message + u'\n'
-		if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr
-			output = output.encode(preferredencoding())
-		sys.stderr.write(output)
-
-	def to_cons_title(self, message):
-		"""Set console/terminal window title to message."""
-		if not self.params.get('consoletitle', False):
-			return
-		if os.name == 'nt' and ctypes.windll.kernel32.GetConsoleWindow():
-			# c_wchar_p() might not be necessary if `message` is
-			# already of type unicode()
-			ctypes.windll.kernel32.SetConsoleTitleW(ctypes.c_wchar_p(message))
-		elif 'TERM' in os.environ:
-			sys.stderr.write('\033]0;%s\007' % message.encode(preferredencoding()))
-
-	def fixed_template(self):
-		"""Checks if the output template is fixed."""
-		return (re.search(u'(?u)%\\(.+?\\)s', self.params['outtmpl']) is None)
-
-	def trouble(self, message=None):
-		"""Determine action to take when a download problem appears.
-
-		Depending on if the downloader has been configured to ignore
-		download errors or not, this method may throw an exception or
-		not when errors are found, after printing the message.
-		"""
-		if message is not None:
-			self.to_stderr(message)
-		if not self.params.get('ignoreerrors', False):
-			raise DownloadError(message)
-		self._download_retcode = 1
-
-	def slow_down(self, start_time, byte_counter):
-		"""Sleep if the download speed is over the rate limit."""
-		rate_limit = self.params.get('ratelimit', None)
-		if rate_limit is None or byte_counter == 0:
-			return
-		now = time.time()
-		elapsed = now - start_time
-		if elapsed <= 0.0:
-			return
-		speed = float(byte_counter) / elapsed
-		if speed > rate_limit:
-			time.sleep((byte_counter - rate_limit * (now - start_time)) / rate_limit)
-
-	def temp_name(self, filename):
-		"""Returns a temporary filename for the given filename."""
-		if self.params.get('nopart', False) or filename == u'-' or \
-				(os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))):
-			return filename
-		return filename + u'.part'
-
-	def undo_temp_name(self, filename):
-		if filename.endswith(u'.part'):
-			return filename[:-len(u'.part')]
-		return filename
-
-	def try_rename(self, old_filename, new_filename):
-		try:
-			if old_filename == new_filename:
-				return
-			os.rename(encodeFilename(old_filename), encodeFilename(new_filename))
-		except (IOError, OSError) as err:
-			self.trouble(u'ERROR: unable to rename file')
-
-	def try_utime(self, filename, last_modified_hdr):
-		"""Try to set the last-modified time of the given file."""
-		if last_modified_hdr is None:
-			return
-		if not os.path.isfile(encodeFilename(filename)):
-			return
-		timestr = last_modified_hdr
-		if timestr is None:
-			return
-		filetime = timeconvert(timestr)
-		if filetime is None:
-			return filetime
-		try:
-			os.utime(filename, (time.time(), filetime))
-		except:
-			pass
-		return filetime
-
-	def report_writedescription(self, descfn):
-		""" Report that the description file is being written """
-		self.to_screen(u'[info] Writing video description to: ' + descfn)
-
-	def report_writesubtitles(self, srtfn):
-		""" Report that the subtitles file is being written """
-		self.to_screen(u'[info] Writing video subtitles to: ' + srtfn)
-
-	def report_writeinfojson(self, infofn):
-		""" Report that the metadata file has been written """
-		self.to_screen(u'[info] Video description metadata as JSON to: ' + infofn)
-
-	def report_destination(self, filename):
-		"""Report destination filename."""
-		self.to_screen(u'[download] Destination: ' + filename)
-
-	def report_progress(self, percent_str, data_len_str, speed_str, eta_str):
-		"""Report download progress."""
-		if self.params.get('noprogress', False):
-			return
-		self.to_screen(u'\r[download] %s of %s at %s ETA %s' %
-				(percent_str, data_len_str, speed_str, eta_str), skip_eol=True)
-		self.to_cons_title(u'youtube-dl - %s of %s at %s ETA %s' %
-				(percent_str.strip(), data_len_str.strip(), speed_str.strip(), eta_str.strip()))
-
-	def report_resuming_byte(self, resume_len):
-		"""Report attempt to resume at given byte."""
-		self.to_screen(u'[download] Resuming download at byte %s' % resume_len)
-
-	def report_retry(self, count, retries):
-		"""Report retry in case of HTTP error 5xx"""
-		self.to_screen(u'[download] Got server HTTP error. Retrying (attempt %d of %d)...' % (count, retries))
-
-	def report_file_already_downloaded(self, file_name):
-		"""Report file has already been fully downloaded."""
-		try:
-			self.to_screen(u'[download] %s has already been downloaded' % file_name)
-		except (UnicodeEncodeError) as err:
-			self.to_screen(u'[download] The file has already been downloaded')
-
-	def report_unable_to_resume(self):
-		"""Report it was impossible to resume download."""
-		self.to_screen(u'[download] Unable to resume')
-
-	def report_finish(self):
-		"""Report download finished."""
-		if self.params.get('noprogress', False):
-			self.to_screen(u'[download] Download completed')
-		else:
-			self.to_screen(u'')
-
-	def increment_downloads(self):
-		"""Increment the ordinal that assigns a number to each file."""
-		self._num_downloads += 1
-
-	def prepare_filename(self, info_dict):
-		"""Generate the output filename."""
-		try:
-			template_dict = dict(info_dict)
-
-			template_dict['epoch'] = int(time.time())
-			template_dict['autonumber'] = u'%05d' % self._num_downloads
-
-			template_dict = dict((key, u'NA' if val is None else val) for key, val in template_dict.items())
-			template_dict = dict((k, sanitize_filename(compat_str(v), self.params.get('restrictfilenames'))) for k,v in template_dict.items())
-
-			filename = self.params['outtmpl'] % template_dict
-			return filename
-		except (ValueError, KeyError) as err:
-			self.trouble(u'ERROR: invalid system charset or erroneous output template')
-			return None
-
-	def _match_entry(self, info_dict):
-		""" Returns None iff the file should be downloaded """
-
-		title = info_dict['title']
-		matchtitle = self.params.get('matchtitle', False)
-		if matchtitle:
-			matchtitle = matchtitle.decode('utf8')
-			if not re.search(matchtitle, title, re.IGNORECASE):
-				return u'[download] "' + title + '" title did not match pattern "' + matchtitle + '"'
-		rejecttitle = self.params.get('rejecttitle', False)
-		if rejecttitle:
-			rejecttitle = rejecttitle.decode('utf8')
-			if re.search(rejecttitle, title, re.IGNORECASE):
-				return u'"' + title + '" title matched reject pattern "' + rejecttitle + '"'
-		return None
-
-	def process_info(self, info_dict):
-		"""Process a single dictionary returned by an InfoExtractor."""
-
-		# Keep for backwards compatibility
-		info_dict['stitle'] = info_dict['title']
-
-		if not 'format' in info_dict:
-			info_dict['format'] = info_dict['ext']
-
-		reason = self._match_entry(info_dict)
-		if reason is not None:
-			self.to_screen(u'[download] ' + reason)
-			return
-
-		max_downloads = self.params.get('max_downloads')
-		if max_downloads is not None:
-			if self._num_downloads > int(max_downloads):
-				raise MaxDownloadsReached()
-
-		filename = self.prepare_filename(info_dict)
-
-		# Forced printings
-		if self.params.get('forcetitle', False):
-			compat_print(info_dict['title'])
-		if self.params.get('forceurl', False):
-			compat_print(info_dict['url'])
-		if self.params.get('forcethumbnail', False) and 'thumbnail' in info_dict:
-			compat_print(info_dict['thumbnail'])
-		if self.params.get('forcedescription', False) and 'description' in info_dict:
-			compat_print(info_dict['description'])
-		if self.params.get('forcefilename', False) and filename is not None:
-			compat_print(filename)
-		if self.params.get('forceformat', False):
-			compat_print(info_dict['format'])
-
-		# Do nothing else if in simulate mode
-		if self.params.get('simulate', False):
-			return
-
-		if filename is None:
-			return
-
-		try:
-			dn = os.path.dirname(encodeFilename(filename))
-			if dn != '' and not os.path.exists(dn): # dn is already encoded
-				os.makedirs(dn)
-		except (OSError, IOError) as err:
-			self.trouble(u'ERROR: unable to create directory ' + compat_str(err))
-			return
-
-		if self.params.get('writedescription', False):
-			try:
-				descfn = filename + u'.description'
-				self.report_writedescription(descfn)
-				descfile = open(encodeFilename(descfn), 'wb')
-				try:
-					descfile.write(info_dict['description'].encode('utf-8'))
-				finally:
-					descfile.close()
-			except (OSError, IOError):
-				self.trouble(u'ERROR: Cannot write description file ' + descfn)
-				return
-
-		if self.params.get('writesubtitles', False) and 'subtitles' in info_dict and info_dict['subtitles']:
-			# subtitles download errors are already managed as troubles in relevant IE
-			# that way it will silently go on when used with unsupporting IE
-			try:
-				srtfn = filename.rsplit('.', 1)[0] + u'.srt'
-				self.report_writesubtitles(srtfn)
-				srtfile = open(encodeFilename(srtfn), 'wb')
-				try:
-					srtfile.write(info_dict['subtitles'].encode('utf-8'))
-				finally:
-					srtfile.close()
-			except (OSError, IOError):
-				self.trouble(u'ERROR: Cannot write subtitles file ' + descfn)
-				return
-
-		if self.params.get('writeinfojson', False):
-			infofn = filename + u'.info.json'
-			self.report_writeinfojson(infofn)
-			try:
-				json.dump
-			except (NameError,AttributeError):
-				self.trouble(u'ERROR: No JSON encoder found. Update to Python 2.6+, setup a json module, or leave out --write-info-json.')
-				return
-			try:
-				infof = open(encodeFilename(infofn), 'wb')
-				try:
-					json_info_dict = dict((k,v) for k,v in info_dict.iteritems() if not k in ('urlhandle',))
-					json.dump(json_info_dict, infof)
-				finally:
-					infof.close()
-			except (OSError, IOError):
-				self.trouble(u'ERROR: Cannot write metadata to JSON file ' + infofn)
-				return
-
-		if not self.params.get('skip_download', False):
-			if self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(filename)):
-				success = True
-			else:
-				try:
-					success = self._do_download(filename, info_dict)
-				except (OSError, IOError) as err:
-					raise UnavailableVideoError
-				except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
-					self.trouble(u'ERROR: unable to download video data: %s' % str(err))
-					return
-				except (ContentTooShortError, ) as err:
-					self.trouble(u'ERROR: content too short (expected %s bytes and served %s)' % (err.expected, err.downloaded))
-					return
-
-			if success:
-				try:
-					self.post_process(filename, info_dict)
-				except (PostProcessingError) as err:
-					self.trouble(u'ERROR: postprocessing: %s' % str(err))
-					return
-
-	def download(self, url_list):
-		"""Download a given list of URLs."""
-		if len(url_list) > 1 and self.fixed_template():
-			raise SameFileError(self.params['outtmpl'])
-
-		for url in url_list:
-			suitable_found = False
-			for ie in self._ies:
-				# Go to next InfoExtractor if not suitable
-				if not ie.suitable(url):
-					continue
-
-				# Warn if the _WORKING attribute is False
-				if not ie.working():
-					self.trouble(u'WARNING: the program functionality for this site has been marked as broken, '
-						         u'and will probably not work. If you want to go on, use the -i option.')
-
-				# Suitable InfoExtractor found
-				suitable_found = True
-
-				# Extract information from URL and process it
-				videos = ie.extract(url)
-				for video in videos or []:
-					video['extractor'] = ie.IE_NAME
-					try:
-						self.increment_downloads()
-						self.process_info(video)
-					except UnavailableVideoError:
-						self.trouble(u'\nERROR: unable to download video')
-
-				# Suitable InfoExtractor had been found; go to next URL
-				break
-
-			if not suitable_found:
-				self.trouble(u'ERROR: no suitable InfoExtractor: %s' % url)
-
-		return self._download_retcode
-
-	def post_process(self, filename, ie_info):
-		"""Run the postprocessing chain on the given file."""
-		info = dict(ie_info)
-		info['filepath'] = filename
-		for pp in self._pps:
-			info = pp.run(info)
-			if info is None:
-				break
-
-	def _download_with_rtmpdump(self, filename, url, player_url):
-		self.report_destination(filename)
-		tmpfilename = self.temp_name(filename)
-
-		# Check for rtmpdump first
-		try:
-			subprocess.call(['rtmpdump', '-h'], stdout=(file(os.path.devnull, 'w')), stderr=subprocess.STDOUT)
-		except (OSError, IOError):
-			self.trouble(u'ERROR: RTMP download detected but "rtmpdump" could not be run')
-			return False
-
-		# Download using rtmpdump. rtmpdump returns exit code 2 when
-		# the connection was interrumpted and resuming appears to be
-		# possible. This is part of rtmpdump's normal usage, AFAIK.
-		basic_args = ['rtmpdump', '-q'] + [[], ['-W', player_url]][player_url is not None] + ['-r', url, '-o', tmpfilename]
-		args = basic_args + [[], ['-e', '-k', '1']][self.params.get('continuedl', False)]
-		if self.params.get('verbose', False):
-			try:
-				import pipes
-				shell_quote = lambda args: ' '.join(map(pipes.quote, args))
-			except ImportError:
-				shell_quote = repr
-			self.to_screen(u'[debug] rtmpdump command line: ' + shell_quote(args))
-		retval = subprocess.call(args)
-		while retval == 2 or retval == 1:
-			prevsize = os.path.getsize(encodeFilename(tmpfilename))
-			self.to_screen(u'\r[rtmpdump] %s bytes' % prevsize, skip_eol=True)
-			time.sleep(5.0) # This seems to be needed
-			retval = subprocess.call(basic_args + ['-e'] + [[], ['-k', '1']][retval == 1])
-			cursize = os.path.getsize(encodeFilename(tmpfilename))
-			if prevsize == cursize and retval == 1:
-				break
-			 # Some rtmp streams seem abort after ~ 99.8%. Don't complain for those
-			if prevsize == cursize and retval == 2 and cursize > 1024:
-				self.to_screen(u'\r[rtmpdump] Could not download the whole video. This can happen for some advertisements.')
-				retval = 0
-				break
-		if retval == 0:
-			self.to_screen(u'\r[rtmpdump] %s bytes' % os.path.getsize(encodeFilename(tmpfilename)))
-			self.try_rename(tmpfilename, filename)
-			return True
-		else:
-			self.trouble(u'\nERROR: rtmpdump exited with code %d' % retval)
-			return False
-
-	def _do_download(self, filename, info_dict):
-		url = info_dict['url']
-		player_url = info_dict.get('player_url', None)
-
-		# Check file already present
-		if self.params.get('continuedl', False) and os.path.isfile(encodeFilename(filename)) and not self.params.get('nopart', False):
-			self.report_file_already_downloaded(filename)
-			return True
-
-		# Attempt to download using rtmpdump
-		if url.startswith('rtmp'):
-			return self._download_with_rtmpdump(filename, url, player_url)
-
-		tmpfilename = self.temp_name(filename)
-		stream = None
-
-		# Do not include the Accept-Encoding header
-		headers = {'Youtubedl-no-compression': 'True'}
-		basic_request = compat_urllib_request.Request(url, None, headers)
-		request = compat_urllib_request.Request(url, None, headers)
-
-		# Establish possible resume length
-		if os.path.isfile(encodeFilename(tmpfilename)):
-			resume_len = os.path.getsize(encodeFilename(tmpfilename))
-		else:
-			resume_len = 0
-
-		open_mode = 'wb'
-		if resume_len != 0:
-			if self.params.get('continuedl', False):
-				self.report_resuming_byte(resume_len)
-				request.add_header('Range','bytes=%d-' % resume_len)
-				open_mode = 'ab'
-			else:
-				resume_len = 0
-
-		count = 0
-		retries = self.params.get('retries', 0)
-		while count <= retries:
-			# Establish connection
-			try:
-				if count == 0 and 'urlhandle' in info_dict:
-					data = info_dict['urlhandle']
-				data = compat_urllib_request.urlopen(request)
-				break
-			except (compat_urllib_error.HTTPError, ) as err:
-				if (err.code < 500 or err.code >= 600) and err.code != 416:
-					# Unexpected HTTP error
-					raise
-				elif err.code == 416:
-					# Unable to resume (requested range not satisfiable)
-					try:
-						# Open the connection again without the range header
-						data = compat_urllib_request.urlopen(basic_request)
-						content_length = data.info()['Content-Length']
-					except (compat_urllib_error.HTTPError, ) as err:
-						if err.code < 500 or err.code >= 600:
-							raise
-					else:
-						# Examine the reported length
-						if (content_length is not None and
-								(resume_len - 100 < int(content_length) < resume_len + 100)):
-							# The file had already been fully downloaded.
-							# Explanation to the above condition: in issue #175 it was revealed that
-							# YouTube sometimes adds or removes a few bytes from the end of the file,
-							# changing the file size slightly and causing problems for some users. So
-							# I decided to implement a suggested change and consider the file
-							# completely downloaded if the file size differs less than 100 bytes from
-							# the one in the hard drive.
-							self.report_file_already_downloaded(filename)
-							self.try_rename(tmpfilename, filename)
-							return True
-						else:
-							# The length does not match, we start the download over
-							self.report_unable_to_resume()
-							open_mode = 'wb'
-							break
-			# Retry
-			count += 1
-			if count <= retries:
-				self.report_retry(count, retries)
-
-		if count > retries:
-			self.trouble(u'ERROR: giving up after %s retries' % retries)
-			return False
-
-		data_len = data.info().get('Content-length', None)
-		if data_len is not None:
-			data_len = int(data_len) + resume_len
-		data_len_str = self.format_bytes(data_len)
-		byte_counter = 0 + resume_len
-		block_size = self.params.get('buffersize', 1024)
-		start = time.time()
-		while True:
-			# Download and write
-			before = time.time()
-			data_block = data.read(block_size)
-			after = time.time()
-			if len(data_block) == 0:
-				break
-			byte_counter += len(data_block)
-
-			# Open file just in time
-			if stream is None:
-				try:
-					(stream, tmpfilename) = sanitize_open(tmpfilename, open_mode)
-					assert stream is not None
-					filename = self.undo_temp_name(tmpfilename)
-					self.report_destination(filename)
-				except (OSError, IOError) as err:
-					self.trouble(u'ERROR: unable to open for writing: %s' % str(err))
-					return False
-			try:
-				stream.write(data_block)
-			except (IOError, OSError) as err:
-				self.trouble(u'\nERROR: unable to write data: %s' % str(err))
-				return False
-			if not self.params.get('noresizebuffer', False):
-				block_size = self.best_block_size(after - before, len(data_block))
-
-			# Progress message
-			speed_str = self.calc_speed(start, time.time(), byte_counter - resume_len)
-			if data_len is None:
-				self.report_progress('Unknown %', data_len_str, speed_str, 'Unknown ETA')
-			else:
-				percent_str = self.calc_percent(byte_counter, data_len)
-				eta_str = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
-				self.report_progress(percent_str, data_len_str, speed_str, eta_str)
-
-			# Apply rate limit
-			self.slow_down(start, byte_counter - resume_len)
-
-		if stream is None:
-			self.trouble(u'\nERROR: Did not get any data blocks')
-			return False
-		stream.close()
-		self.report_finish()
-		if data_len is not None and byte_counter != data_len:
-			raise ContentTooShortError(byte_counter, int(data_len))
-		self.try_rename(tmpfilename, filename)
-
-		# Update file modification time
-		if self.params.get('updatetime', True):
-			info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))
-
-		return True
+    """File Downloader class.
+
+    File downloader objects are the ones responsible of downloading the
+    actual video file and writing it to disk if the user has requested
+    it, among some other tasks. In most cases there should be one per
+    program. As, given a video URL, the downloader doesn't know how to
+    extract all the needed information, task that InfoExtractors do, it
+    has to pass the URL to one of them.
+
+    For this, file downloader objects have a method that allows
+    InfoExtractors to be registered in a given order. When it is passed
+    a URL, the file downloader handles it to the first InfoExtractor it
+    finds that reports being able to handle it. The InfoExtractor extracts
+    all the information about the video or videos the URL refers to, and
+    asks the FileDownloader to process the video information, possibly
+    downloading the video.
+
+    File downloaders accept a lot of parameters. In order not to saturate
+    the object constructor with arguments, it receives a dictionary of
+    options instead. These options are available through the params
+    attribute for the InfoExtractors to use. The FileDownloader also
+    registers itself as the downloader in charge for the InfoExtractors
+    that are added to it, so this is a "mutual registration".
+
+    Available options:
+
+    username:          Username for authentication purposes.
+    password:          Password for authentication purposes.
+    usenetrc:          Use netrc for authentication instead.
+    quiet:             Do not print messages to stdout.
+    forceurl:          Force printing final URL.
+    forcetitle:        Force printing title.
+    forcethumbnail:    Force printing thumbnail URL.
+    forcedescription:  Force printing description.
+    forcefilename:     Force printing final filename.
+    simulate:          Do not download the video files.
+    format:            Video format code.
+    format_limit:      Highest quality format to try.
+    outtmpl:           Template for output names.
+    restrictfilenames: Do not allow "&" and spaces in file names
+    ignoreerrors:      Do not stop on download errors.
+    ratelimit:         Download speed limit, in bytes/sec.
+    nooverwrites:      Prevent overwriting files.
+    retries:           Number of times to retry for HTTP error 5xx
+    buffersize:        Size of download buffer in bytes.
+    noresizebuffer:    Do not automatically resize the download buffer.
+    continuedl:        Try to continue downloads if possible.
+    noprogress:        Do not print the progress bar.
+    playliststart:     Playlist item to start at.
+    playlistend:       Playlist item to end at.
+    matchtitle:        Download only matching titles.
+    rejecttitle:       Reject downloads for matching titles.
+    logtostderr:       Log messages to stderr instead of stdout.
+    consoletitle:      Display progress in console window's titlebar.
+    nopart:            Do not use temporary .part files.
+    updatetime:        Use the Last-modified header to set output file timestamps.
+    writedescription:  Write the video description to a .description file
+    writeinfojson:     Write the video description to a .info.json file
+    writesubtitles:    Write the video subtitles to a .srt file
+    subtitleslang:     Language of the subtitles to download
+    """
+
+    params = None
+    _ies = []
+    _pps = []
+    _download_retcode = None
+    _num_downloads = None
+    _screen_file = None
+
+    def __init__(self, params):
+        """Create a FileDownloader object with the given options."""
+        self._ies = []
+        self._pps = []
+        self._download_retcode = 0
+        self._num_downloads = 0
+        self._screen_file = [sys.stdout, sys.stderr][params.get('logtostderr', False)]
+        self.params = params
+
+        if '%(stitle)s' in self.params['outtmpl']:
+            self.to_stderr(u'WARNING: %(stitle)s is deprecated. Use the %(title)s and the --restrict-filenames flag(which also secures %(uploader)s et al) instead.')
+
+    @staticmethod
+    def format_bytes(bytes):
+        if bytes is None:
+            return 'N/A'
+        if type(bytes) is str:
+            bytes = float(bytes)
+        if bytes == 0.0:
+            exponent = 0
+        else:
+            exponent = int(math.log(bytes, 1024.0))
+        suffix = 'bkMGTPEZY'[exponent]
+        converted = float(bytes) / float(1024 ** exponent)
+        return '%.2f%s' % (converted, suffix)
+
+    @staticmethod
+    def calc_percent(byte_counter, data_len):
+        if data_len is None:
+            return '---.-%'
+        return '%6s' % ('%3.1f%%' % (float(byte_counter) / float(data_len) * 100.0))
+
+    @staticmethod
+    def calc_eta(start, now, total, current):
+        if total is None:
+            return '--:--'
+        dif = now - start
+        if current == 0 or dif < 0.001: # One millisecond
+            return '--:--'
+        rate = float(current) / dif
+        eta = int((float(total) - float(current)) / rate)
+        (eta_mins, eta_secs) = divmod(eta, 60)
+        if eta_mins > 99:
+            return '--:--'
+        return '%02d:%02d' % (eta_mins, eta_secs)
+
+    @staticmethod
+    def calc_speed(start, now, bytes):
+        dif = now - start
+        if bytes == 0 or dif < 0.001: # One millisecond
+            return '%10s' % '---b/s'
+        return '%10s' % ('%s/s' % FileDownloader.format_bytes(float(bytes) / dif))
+
+    @staticmethod
+    def best_block_size(elapsed_time, bytes):
+        new_min = max(bytes / 2.0, 1.0)
+        new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB
+        if elapsed_time < 0.001:
+            return int(new_max)
+        rate = bytes / elapsed_time
+        if rate > new_max:
+            return int(new_max)
+        if rate < new_min:
+            return int(new_min)
+        return int(rate)
+
+    @staticmethod
+    def parse_bytes(bytestr):
+        """Parse a string indicating a byte quantity into an integer."""
+        matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr)
+        if matchobj is None:
+            return None
+        number = float(matchobj.group(1))
+        multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
+        return int(round(number * multiplier))
+
+    def add_info_extractor(self, ie):
+        """Add an InfoExtractor object to the end of the list."""
+        self._ies.append(ie)
+        ie.set_downloader(self)
+
+    def add_post_processor(self, pp):
+        """Add a PostProcessor object to the end of the chain."""
+        self._pps.append(pp)
+        pp.set_downloader(self)
+
+    def to_screen(self, message, skip_eol=False):
+        """Print message to stdout if not in quiet mode."""
+        assert type(message) == type(u'')
+        if not self.params.get('quiet', False):
+            terminator = [u'\n', u''][skip_eol]
+            output = message + terminator
+            if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr
+                output = output.encode(preferredencoding(), 'ignore')
+            self._screen_file.write(output)
+            self._screen_file.flush()
+
+    def to_stderr(self, message):
+        """Print message to stderr."""
+        assert type(message) == type(u'')
+        output = message + u'\n'
+        if 'b' in getattr(self._screen_file, 'mode', '') or sys.version_info[0] < 3: # Python 2 lies about the mode of sys.stdout/sys.stderr
+            output = output.encode(preferredencoding())
+        sys.stderr.write(output)
+
+    def to_cons_title(self, message):
+        """Set console/terminal window title to message."""
+        if not self.params.get('consoletitle', False):
+            return
+        if os.name == 'nt' and ctypes.windll.kernel32.GetConsoleWindow():
+            # c_wchar_p() might not be necessary if `message` is
+            # already of type unicode()
+            ctypes.windll.kernel32.SetConsoleTitleW(ctypes.c_wchar_p(message))
+        elif 'TERM' in os.environ:
+            sys.stderr.write('\033]0;%s\007' % message.encode(preferredencoding()))
+
+    def fixed_template(self):
+        """Checks if the output template is fixed."""
+        return (re.search(u'(?u)%\\(.+?\\)s', self.params['outtmpl']) is None)
+
+    def trouble(self, message=None):
+        """Determine action to take when a download problem appears.
+
+        Depending on if the downloader has been configured to ignore
+        download errors or not, this method may throw an exception or
+        not when errors are found, after printing the message.
+        """
+        if message is not None:
+            self.to_stderr(message)
+        if not self.params.get('ignoreerrors', False):
+            raise DownloadError(message)
+        self._download_retcode = 1
+
+    def slow_down(self, start_time, byte_counter):
+        """Sleep if the download speed is over the rate limit."""
+        rate_limit = self.params.get('ratelimit', None)
+        if rate_limit is None or byte_counter == 0:
+            return
+        now = time.time()
+        elapsed = now - start_time
+        if elapsed <= 0.0:
+            return
+        speed = float(byte_counter) / elapsed
+        if speed > rate_limit:
+            time.sleep((byte_counter - rate_limit * (now - start_time)) / rate_limit)
+
+    def temp_name(self, filename):
+        """Returns a temporary filename for the given filename."""
+        if self.params.get('nopart', False) or filename == u'-' or \
+                (os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))):
+            return filename
+        return filename + u'.part'
+
+    def undo_temp_name(self, filename):
+        if filename.endswith(u'.part'):
+            return filename[:-len(u'.part')]
+        return filename
+
+    def try_rename(self, old_filename, new_filename):
+        try:
+            if old_filename == new_filename:
+                return
+            os.rename(encodeFilename(old_filename), encodeFilename(new_filename))
+        except (IOError, OSError) as err:
+            self.trouble(u'ERROR: unable to rename file')
+
+    def try_utime(self, filename, last_modified_hdr):
+        """Try to set the last-modified time of the given file."""
+        if last_modified_hdr is None:
+            return
+        if not os.path.isfile(encodeFilename(filename)):
+            return
+        timestr = last_modified_hdr
+        if timestr is None:
+            return
+        filetime = timeconvert(timestr)
+        if filetime is None:
+            return filetime
+        try:
+            os.utime(filename, (time.time(), filetime))
+        except:
+            pass
+        return filetime
+
+    def report_writedescription(self, descfn):
+        """ Report that the description file is being written """
+        self.to_screen(u'[info] Writing video description to: ' + descfn)
+
+    def report_writesubtitles(self, srtfn):
+        """ Report that the subtitles file is being written """
+        self.to_screen(u'[info] Writing video subtitles to: ' + srtfn)
+
+    def report_writeinfojson(self, infofn):
+        """ Report that the metadata file has been written """
+        self.to_screen(u'[info] Video description metadata as JSON to: ' + infofn)
+
+    def report_destination(self, filename):
+        """Report destination filename."""
+        self.to_screen(u'[download] Destination: ' + filename)
+
+    def report_progress(self, percent_str, data_len_str, speed_str, eta_str):
+        """Report download progress."""
+        if self.params.get('noprogress', False):
+            return
+        self.to_screen(u'\r[download] %s of %s at %s ETA %s' %
+                (percent_str, data_len_str, speed_str, eta_str), skip_eol=True)
+        self.to_cons_title(u'youtube-dl - %s of %s at %s ETA %s' %
+                (percent_str.strip(), data_len_str.strip(), speed_str.strip(), eta_str.strip()))
+
+    def report_resuming_byte(self, resume_len):
+        """Report attempt to resume at given byte."""
+        self.to_screen(u'[download] Resuming download at byte %s' % resume_len)
+
+    def report_retry(self, count, retries):
+        """Report retry in case of HTTP error 5xx"""
+        self.to_screen(u'[download] Got server HTTP error. Retrying (attempt %d of %d)...' % (count, retries))
+
+    def report_file_already_downloaded(self, file_name):
+        """Report file has already been fully downloaded."""
+        try:
+            self.to_screen(u'[download] %s has already been downloaded' % file_name)
+        except (UnicodeEncodeError) as err:
+            self.to_screen(u'[download] The file has already been downloaded')
+
+    def report_unable_to_resume(self):
+        """Report it was impossible to resume download."""
+        self.to_screen(u'[download] Unable to resume')
+
+    def report_finish(self):
+        """Report download finished."""
+        if self.params.get('noprogress', False):
+            self.to_screen(u'[download] Download completed')
+        else:
+            self.to_screen(u'')
+
+    def increment_downloads(self):
+        """Increment the ordinal that assigns a number to each file."""
+        self._num_downloads += 1
+
+    def prepare_filename(self, info_dict):
+        """Generate the output filename."""
+        try:
+            template_dict = dict(info_dict)
+
+            template_dict['epoch'] = int(time.time())
+            template_dict['autonumber'] = u'%05d' % self._num_downloads
+
+            template_dict = dict((key, u'NA' if val is None else val) for key, val in template_dict.items())
+            template_dict = dict((k, sanitize_filename(compat_str(v), self.params.get('restrictfilenames'))) for k,v in template_dict.items())
+
+            filename = self.params['outtmpl'] % template_dict
+            return filename
+        except (ValueError, KeyError) as err:
+            self.trouble(u'ERROR: invalid system charset or erroneous output template')
+            return None
+
+    def _match_entry(self, info_dict):
+        """ Returns None iff the file should be downloaded """
+
+        title = info_dict['title']
+        matchtitle = self.params.get('matchtitle', False)
+        if matchtitle:
+            matchtitle = matchtitle.decode('utf8')
+            if not re.search(matchtitle, title, re.IGNORECASE):
+                return u'[download] "' + title + '" title did not match pattern "' + matchtitle + '"'
+        rejecttitle = self.params.get('rejecttitle', False)
+        if rejecttitle:
+            rejecttitle = rejecttitle.decode('utf8')
+            if re.search(rejecttitle, title, re.IGNORECASE):
+                return u'"' + title + '" title matched reject pattern "' + rejecttitle + '"'
+        return None
+
+    def process_info(self, info_dict):
+        """Process a single dictionary returned by an InfoExtractor."""
+
+        # Keep for backwards compatibility
+        info_dict['stitle'] = info_dict['title']
+
+        if not 'format' in info_dict:
+            info_dict['format'] = info_dict['ext']
+
+        reason = self._match_entry(info_dict)
+        if reason is not None:
+            self.to_screen(u'[download] ' + reason)
+            return
+
+        max_downloads = self.params.get('max_downloads')
+        if max_downloads is not None:
+            if self._num_downloads > int(max_downloads):
+                raise MaxDownloadsReached()
+
+        filename = self.prepare_filename(info_dict)
+
+        # Forced printings
+        if self.params.get('forcetitle', False):
+            compat_print(info_dict['title'])
+        if self.params.get('forceurl', False):
+            compat_print(info_dict['url'])
+        if self.params.get('forcethumbnail', False) and 'thumbnail' in info_dict:
+            compat_print(info_dict['thumbnail'])
+        if self.params.get('forcedescription', False) and 'description' in info_dict:
+            compat_print(info_dict['description'])
+        if self.params.get('forcefilename', False) and filename is not None:
+            compat_print(filename)
+        if self.params.get('forceformat', False):
+            compat_print(info_dict['format'])
+
+        # Do nothing else if in simulate mode
+        if self.params.get('simulate', False):
+            return
+
+        if filename is None:
+            return
+
+        try:
+            dn = os.path.dirname(encodeFilename(filename))
+            if dn != '' and not os.path.exists(dn): # dn is already encoded
+                os.makedirs(dn)
+        except (OSError, IOError) as err:
+            self.trouble(u'ERROR: unable to create directory ' + compat_str(err))
+            return
+
+        if self.params.get('writedescription', False):
+            try:
+                descfn = filename + u'.description'
+                self.report_writedescription(descfn)
+                descfile = open(encodeFilename(descfn), 'wb')
+                try:
+                    descfile.write(info_dict['description'].encode('utf-8'))
+                finally:
+                    descfile.close()
+            except (OSError, IOError):
+                self.trouble(u'ERROR: Cannot write description file ' + descfn)
+                return
+
+        if self.params.get('writesubtitles', False) and 'subtitles' in info_dict and info_dict['subtitles']:
+            # subtitles download errors are already managed as troubles in relevant IE
+            # that way it will silently go on when used with unsupporting IE
+            try:
+                srtfn = filename.rsplit('.', 1)[0] + u'.srt'
+                self.report_writesubtitles(srtfn)
+                srtfile = open(encodeFilename(srtfn), 'wb')
+                try:
+                    srtfile.write(info_dict['subtitles'].encode('utf-8'))
+                finally:
+                    srtfile.close()
+            except (OSError, IOError):
+                self.trouble(u'ERROR: Cannot write subtitles file ' + descfn)
+                return
+
+        if self.params.get('writeinfojson', False):
+            infofn = filename + u'.info.json'
+            self.report_writeinfojson(infofn)
+            try:
+                json.dump
+            except (NameError,AttributeError):
+                self.trouble(u'ERROR: No JSON encoder found. Update to Python 2.6+, setup a json module, or leave out --write-info-json.')
+                return
+            try:
+                infof = open(encodeFilename(infofn), 'wb')
+                try:
+                    json_info_dict = dict((k,v) for k,v in info_dict.iteritems() if not k in ('urlhandle',))
+                    json.dump(json_info_dict, infof)
+                finally:
+                    infof.close()
+            except (OSError, IOError):
+                self.trouble(u'ERROR: Cannot write metadata to JSON file ' + infofn)
+                return
+
+        if not self.params.get('skip_download', False):
+            if self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(filename)):
+                success = True
+            else:
+                try:
+                    success = self._do_download(filename, info_dict)
+                except (OSError, IOError) as err:
+                    raise UnavailableVideoError
+                except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
+                    self.trouble(u'ERROR: unable to download video data: %s' % str(err))
+                    return
+                except (ContentTooShortError, ) as err:
+                    self.trouble(u'ERROR: content too short (expected %s bytes and served %s)' % (err.expected, err.downloaded))
+                    return
+
+            if success:
+                try:
+                    self.post_process(filename, info_dict)
+                except (PostProcessingError) as err:
+                    self.trouble(u'ERROR: postprocessing: %s' % str(err))
+                    return
+
+    def download(self, url_list):
+        """Download a given list of URLs."""
+        if len(url_list) > 1 and self.fixed_template():
+            raise SameFileError(self.params['outtmpl'])
+
+        for url in url_list:
+            suitable_found = False
+            for ie in self._ies:
+                # Go to next InfoExtractor if not suitable
+                if not ie.suitable(url):
+                    continue
+
+                # Warn if the _WORKING attribute is False
+                if not ie.working():
+                    self.trouble(u'WARNING: the program functionality for this site has been marked as broken, '
+                                 u'and will probably not work. If you want to go on, use the -i option.')
+
+                # Suitable InfoExtractor found
+                suitable_found = True
+
+                # Extract information from URL and process it
+                videos = ie.extract(url)
+                for video in videos or []:
+                    video['extractor'] = ie.IE_NAME
+                    try:
+                        self.increment_downloads()
+                        self.process_info(video)
+                    except UnavailableVideoError:
+                        self.trouble(u'\nERROR: unable to download video')
+
+                # Suitable InfoExtractor had been found; go to next URL
+                break
+
+            if not suitable_found:
+                self.trouble(u'ERROR: no suitable InfoExtractor: %s' % url)
+
+        return self._download_retcode
+
+    def post_process(self, filename, ie_info):
+        """Run the postprocessing chain on the given file."""
+        info = dict(ie_info)
+        info['filepath'] = filename
+        for pp in self._pps:
+            info = pp.run(info)
+            if info is None:
+                break
+
+    def _download_with_rtmpdump(self, filename, url, player_url):
+        self.report_destination(filename)
+        tmpfilename = self.temp_name(filename)
+
+        # Check for rtmpdump first
+        try:
+            subprocess.call(['rtmpdump', '-h'], stdout=(file(os.path.devnull, 'w')), stderr=subprocess.STDOUT)
+        except (OSError, IOError):
+            self.trouble(u'ERROR: RTMP download detected but "rtmpdump" could not be run')
+            return False
+
+        # Download using rtmpdump. rtmpdump returns exit code 2 when
+        # the connection was interrumpted and resuming appears to be
+        # possible. This is part of rtmpdump's normal usage, AFAIK.
+        basic_args = ['rtmpdump', '-q'] + [[], ['-W', player_url]][player_url is not None] + ['-r', url, '-o', tmpfilename]
+        args = basic_args + [[], ['-e', '-k', '1']][self.params.get('continuedl', False)]
+        if self.params.get('verbose', False):
+            try:
+                import pipes
+                shell_quote = lambda args: ' '.join(map(pipes.quote, args))
+            except ImportError:
+                shell_quote = repr
+            self.to_screen(u'[debug] rtmpdump command line: ' + shell_quote(args))
+        retval = subprocess.call(args)
+        while retval == 2 or retval == 1:
+            prevsize = os.path.getsize(encodeFilename(tmpfilename))
+            self.to_screen(u'\r[rtmpdump] %s bytes' % prevsize, skip_eol=True)
+            time.sleep(5.0) # This seems to be needed
+            retval = subprocess.call(basic_args + ['-e'] + [[], ['-k', '1']][retval == 1])
+            cursize = os.path.getsize(encodeFilename(tmpfilename))
+            if prevsize == cursize and retval == 1:
+                break
+             # Some rtmp streams seem abort after ~ 99.8%. Don't complain for those
+            if prevsize == cursize and retval == 2 and cursize > 1024:
+                self.to_screen(u'\r[rtmpdump] Could not download the whole video. This can happen for some advertisements.')
+                retval = 0
+                break
+        if retval == 0:
+            self.to_screen(u'\r[rtmpdump] %s bytes' % os.path.getsize(encodeFilename(tmpfilename)))
+            self.try_rename(tmpfilename, filename)
+            return True
+        else:
+            self.trouble(u'\nERROR: rtmpdump exited with code %d' % retval)
+            return False
+
+    def _do_download(self, filename, info_dict):
+        url = info_dict['url']
+        player_url = info_dict.get('player_url', None)
+
+        # Check file already present
+        if self.params.get('continuedl', False) and os.path.isfile(encodeFilename(filename)) and not self.params.get('nopart', False):
+            self.report_file_already_downloaded(filename)
+            return True
+
+        # Attempt to download using rtmpdump
+        if url.startswith('rtmp'):
+            return self._download_with_rtmpdump(filename, url, player_url)
+
+        tmpfilename = self.temp_name(filename)
+        stream = None
+
+        # Do not include the Accept-Encoding header
+        headers = {'Youtubedl-no-compression': 'True'}
+        basic_request = compat_urllib_request.Request(url, None, headers)
+        request = compat_urllib_request.Request(url, None, headers)
+
+        # Establish possible resume length
+        if os.path.isfile(encodeFilename(tmpfilename)):
+            resume_len = os.path.getsize(encodeFilename(tmpfilename))
+        else:
+            resume_len = 0
+
+        open_mode = 'wb'
+        if resume_len != 0:
+            if self.params.get('continuedl', False):
+                self.report_resuming_byte(resume_len)
+                request.add_header('Range','bytes=%d-' % resume_len)
+                open_mode = 'ab'
+            else:
+                resume_len = 0
+
+        count = 0
+        retries = self.params.get('retries', 0)
+        while count <= retries:
+            # Establish connection
+            try:
+                if count == 0 and 'urlhandle' in info_dict:
+                    data = info_dict['urlhandle']
+                data = compat_urllib_request.urlopen(request)
+                break
+            except (compat_urllib_error.HTTPError, ) as err:
+                if (err.code < 500 or err.code >= 600) and err.code != 416:
+                    # Unexpected HTTP error
+                    raise
+                elif err.code == 416:
+                    # Unable to resume (requested range not satisfiable)
+                    try:
+                        # Open the connection again without the range header
+                        data = compat_urllib_request.urlopen(basic_request)
+                        content_length = data.info()['Content-Length']
+                    except (compat_urllib_error.HTTPError, ) as err:
+                        if err.code < 500 or err.code >= 600:
+                            raise
+                    else:
+                        # Examine the reported length
+                        if (content_length is not None and
+                                (resume_len - 100 < int(content_length) < resume_len + 100)):
+                            # The file had already been fully downloaded.
+                            # Explanation to the above condition: in issue #175 it was revealed that
+                            # YouTube sometimes adds or removes a few bytes from the end of the file,
+                            # changing the file size slightly and causing problems for some users. So
+                            # I decided to implement a suggested change and consider the file
+                            # completely downloaded if the file size differs less than 100 bytes from
+                            # the one in the hard drive.
+                            self.report_file_already_downloaded(filename)
+                            self.try_rename(tmpfilename, filename)
+                            return True
+                        else:
+                            # The length does not match, we start the download over
+                            self.report_unable_to_resume()
+                            open_mode = 'wb'
+                            break
+            # Retry
+            count += 1
+            if count <= retries:
+                self.report_retry(count, retries)
+
+        if count > retries:
+            self.trouble(u'ERROR: giving up after %s retries' % retries)
+            return False
+
+        data_len = data.info().get('Content-length', None)
+        if data_len is not None:
+            data_len = int(data_len) + resume_len
+        data_len_str = self.format_bytes(data_len)
+        byte_counter = 0 + resume_len
+        block_size = self.params.get('buffersize', 1024)
+        start = time.time()
+        while True:
+            # Download and write
+            before = time.time()
+            data_block = data.read(block_size)
+            after = time.time()
+            if len(data_block) == 0:
+                break
+            byte_counter += len(data_block)
+
+            # Open file just in time
+            if stream is None:
+                try:
+                    (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode)
+                    assert stream is not None
+                    filename = self.undo_temp_name(tmpfilename)
+                    self.report_destination(filename)
+                except (OSError, IOError) as err:
+                    self.trouble(u'ERROR: unable to open for writing: %s' % str(err))
+                    return False
+            try:
+                stream.write(data_block)
+            except (IOError, OSError) as err:
+                self.trouble(u'\nERROR: unable to write data: %s' % str(err))
+                return False
+            if not self.params.get('noresizebuffer', False):
+                block_size = self.best_block_size(after - before, len(data_block))
+
+            # Progress message
+            speed_str = self.calc_speed(start, time.time(), byte_counter - resume_len)
+            if data_len is None:
+                self.report_progress('Unknown %', data_len_str, speed_str, 'Unknown ETA')
+            else:
+                percent_str = self.calc_percent(byte_counter, data_len)
+                eta_str = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
+                self.report_progress(percent_str, data_len_str, speed_str, eta_str)
+
+            # Apply rate limit
+            self.slow_down(start, byte_counter - resume_len)
+
+        if stream is None:
+            self.trouble(u'\nERROR: Did not get any data blocks')
+            return False
+        stream.close()
+        self.report_finish()
+        if data_len is not None and byte_counter != data_len:
+            raise ContentTooShortError(byte_counter, int(data_len))
+        self.try_rename(tmpfilename, filename)
+
+        # Update file modification time
+        if self.params.get('updatetime', True):
+            info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))
+
+        return True