Python program to download youtube video — written by Ricardo Garcia Gonzalez

#!/usr/bin/env python
#
# Copyright (c) 2006-2008 Ricardo Garcia Gonzalez
#
# Permission is hereby granted, free of charge, to any person obtaining
a
# copy of this software and associated documentation files (the
\”Software\”),
# to deal in the Software without restriction, including without
limitation
# the rights to use, copy, modify, merge, publish, distribute,
sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED \”AS IS\”, WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
# Except as contained in this notice, the name(s) of the above copyright
# holders shall not be used in advertising or otherwise to promote the
# sale, use or other dealings in this Software without prior written
# authorization.
#
import getpass
import httplib
import math
import netrc
import optparse
import os
import re
import socket
import string
import sys
import time
import urllib2

# Global constants
const_1k = 1024
const_initial_block_size = 10 * const_1k
const_epsilon = 0.0001
const_timeout = 120

const_video_url_str = \’http://www.youtube.com/watch?v=%s\’
const_video_url_re = re.compile(r\’^((?:http://)?(?:\\w+\\.)?youtube
\\.com/(?:v/|(?:watch(?:
\\.php)?)?\\?(?:.+&)?v=))?([0-9A-Za-z_-]+)(?(1)[&/].*)?$\’)
const_video_url_format_suffix = \’&fmt=%s\’
const_best_quality_format = 18
const_login_url_str = \’http://www.youtube.com/login?next=/watch%%3Fv%%3D
%s\’
const_login_post_str = \’current_form=loginForm&next=%%2Fwatch%%3Fv%%3D%
s&username=%s&password=%s&action_login=Log+In\’
const_age_url_str = \’http://www.youtube.com/verify_age?next_url=/watch%%
3Fv%%3D%s\’
const_age_post_str = \’next_url=%%2Fwatch%%3Fv%%3D%
s&action_confirm=Confirm\’
const_url_t_param_re = re.compile(r\’, \”t\”: \”([^\”]+)\”\’)
const_video_url_real_str = \’http://www.youtube.com/get_video?video_id=%
s&t=%s\’
const_video_title_re = re.compile(r\’YouTube – ([^< ]*)\’,
re.M | re.I)

# Print error message, followed by standard advice information, and then
exit
def error_advice_exit(error_text):
sys.stderr.write(\’Error: %s.\\n\’ % error_text)
sys.stderr.write(\’Try again several times. It may be a temporary
problem.\\n\’)
sys.stderr.write(\’Other typical problems:\\n\\n\’)
sys.stderr.write(\’* Video no longer exists.\\n\’)
sys.stderr.write(\’* Video requires age confirmation but you did
not provide an account.\\n\’)
sys.stderr.write(\’* You provided the account data, but it is not
valid.\\n\’)
sys.stderr.write(\’* The connection was cut suddenly for some
reason.\\n\’)
sys.stderr.write(\’* YouTube changed their system, and the
program no longer works.\\n\’)
sys.stderr.write(\’\\nTry to confirm you are able to view the
video using a web browser.\\n\’)
sys.stderr.write(\’Use the same video URL and account
information, if needed, with this program.\\n\’)
sys.stderr.write(\’When using a proxy, make sure http_proxy has
http://host:port format.\\n\’)
sys.stderr.write(\’Try again several times and contact me if the
problem persists.\\n\’)
sys.exit(\’\\n\’)

# Wrapper to create custom requests with typical headers
def request_create(url, extra_headers, post_data):
retval = urllib2.Request(url)
if post_data is not None:
retval.add_data(post_data)
# Try to mimic Firefox, at least a little bit
retval.add_header(\’User-Agent\’, \’Mozilla/5.0 (Windows; U;
Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11\’)
retval.add_header(\’Accept-Charset\’,
\’ISO-8859-1,utf-8;q=0.7,*;q=0.7\’)
retval.add_header(\’Accept\’,
\’text/xml,application/xml,application/xhtml
+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5\’)
retval.add_header(\’Accept-Language\’, \’en-us,en;q=0.5\’)
if extra_headers is not None:
for header in extra_headers:
retval.add_header(header[0], header[1])
return retval

# Perform a request, process headers and return response
def perform_request(url, headers=None, data=None):
request = request_create(url, headers, data)
response = urllib2.urlopen(request)
return response

# Conditional print
def cond_print(str):
global cmdl_opts
if not (cmdl_opts.quiet or cmdl_opts.get_url):
sys.stdout.write(str)
sys.stdout.flush()

# Title string normalization
def title_string_norm(title):
title = \’\’.join((x in string.ascii_letters or x in
string.digits) and x or \’ \’ for x in title)
title = \’_\’.join(title.split())
title = title.lower()
return title
# Generic download step
def download_step(return_data_flag, step_title, step_error, url,
post_data=None):
try:
cond_print(\’%s… \’ % step_title)
data = perform_request(url, data=post_data).read()
cond_print(\’done.\\n\’)
if return_data_flag:
return data
return None

except (urllib2.URLError, ValueError, httplib.HTTPException,
TypeError, socket.error):
cond_print(\’failed.\\n\’)
error_advice_exit(step_error)

except KeyboardInterrupt:
sys.exit(\’\\n\’)

# Generic extract step
def extract_step(step_title, step_error, regexp, data):
try:
cond_print(\’%s… \’ % step_title)
match = regexp.search(data)

if match is None:
cond_print(\’failed.\\n\’)
error_advice_exit(step_error)

extracted_data = match.group(1)
cond_print(\’done.\\n\’)
return extracted_data

except KeyboardInterrupt:
sys.exit(\’\\n\’)

# Calculate new block size based on previous block size
def new_block_size(before, after, bytes):
new_min = max(bytes / 2.0, 1.0)
new_max = max(bytes * 2.0, 1.0)
dif = after – before
if dif < const_epsilon: return int(new_max) rate = bytes / dif if rate > new_max:
return int(new_max)
if rate < new_min: return int(new_min) return int(rate) # Get optimum 1k exponent to represent a number of bytes def optimum_k_exp(num_bytes): global const_1k if num_bytes == 0: return 0 return long(math.log(num_bytes, const_1k)) # Get optimum representation of number of bytes def format_bytes(num_bytes): global const_1k try: exp = optimum_k_exp(num_bytes) suffix = \'bkMGTPEZY\'[exp] if exp == 0: return \'%s%s\' % (num_bytes, suffix) converted = float(num_bytes) / float(const_1k**exp) return \'%.2f%s\' % (converted, suffix) except IndexError: sys.exit(\'Error: internal error formatting number of bytes.\') # Calculate ETA and return it in string format as MM:SS def calc_eta(start, now, total, current): dif = now - start if current == 0 or dif < const_epsilon: return \'--:--\' rate = float(current) / dif eta = long((total - current) / rate) (eta_mins, eta_secs) = divmod(eta, 60) if eta_mins > 99:
return \’–:–\’
return \’%02d:%02d\’ % (eta_mins, eta_secs)

# Calculate speed and return it in string format
def calc_speed(start, now, bytes):
dif = now – start
if bytes == 0 or dif < const_epsilon: return \'N/A b\' return format_bytes(float(bytes) / dif) # Title string minimal transformation def title_string_touch(title): return title.replace(os.sep, \'%\') # Create the command line options parser and parse command line cmdl_usage = \'usage: %prog [options] video_url\' cmdl_version = \'2008.03.22\' cmdl_parser = optparse.OptionParser(usage=cmdl_usage, version=cmdl_version, conflict_handler=\'resolve\') cmdl_parser.add_option(\'-h\', \'--help\', action=\'help\', help=\'print this help text and exit\') cmdl_parser.add_option(\'-v\', \'--version\', action=\'version\', help=\'print program version and exit\') cmdl_parser.add_option(\'-u\', \'--username\', dest=\'username\', metavar=\'USERNAME\', help=\'account username\') cmdl_parser.add_option(\'-p\', \'--password\', dest=\'password\', metavar=\'PASSWORD\', help=\'account password\') cmdl_parser.add_option(\'-o\', \'--output\', dest=\'outfile\', metavar=\'FILE\', help=\'output video file name\') cmdl_parser.add_option(\'-q\', \'--quiet\', action=\'store_true\', dest=\'quiet\', help=\'activates quiet mode\') cmdl_parser.add_option(\'-s\', \'--simulate\', action=\'store_true\', dest=\'simulate\', help=\'do not download video\') cmdl_parser.add_option(\'-t\', \'--title\', action=\'store_true\', dest=\'use_title\', help=\'use title in file name\') cmdl_parser.add_option(\'-l\', \'--literal\', action=\'store_true\', dest=\'use_literal\', help=\'use literal title in file name\') cmdl_parser.add_option(\'-n\', \'--netrc\', action=\'store_true\', dest=\'use_netrc\', help=\'use .netrc authentication data\') cmdl_parser.add_option(\'-g\', \'--get-url\', action=\'store_true\', dest=\'get_url\', help=\'print final video URL only\') cmdl_parser.add_option(\'-2\', \'--title-too\', action=\'store_true\', dest=\'get_title\', help=\'used with -g, print title too\') cmdl_parser.add_option(\'-f\', \'--format\', dest=\'video_format\', metavar=\'FORMAT\', help=\'append &fmt=FORMAT to the URL\') cmdl_parser.add_option(\'-b\', \'--best-quality\', action=\'store_true\', dest=\'best_quality\', help=\'alias for -f 18\') (cmdl_opts, cmdl_args) = cmdl_parser.parse_args() # Set socket timeout socket.setdefaulttimeout(const_timeout) # Get video URL if len(cmdl_args) != 1: cmdl_parser.print_help() sys.exit(\'\\n\') video_url_cmdl = cmdl_args[0] # Verify video URL format and convert to \"standard\" format video_url_mo = const_video_url_re.match(video_url_cmdl) if video_url_mo is None: sys.exit(\'Error: URL does not seem to be a youtube video URL. If it is, report a bug.\') video_url_id = video_url_mo.group(2) video_url = const_video_url_str % video_url_id video_format = None if cmdl_opts.best_quality: video_format = const_best_quality_format video_extension = \'.mp4\' else: video_extension = \'.flv\' if cmdl_opts.video_format is not None: if video_format is not None and video_format != cmdl_opts.video_format: sys.exit(\'Error: conflicting video formats specified\\n\') video_format = cmdl_opts.video_format if video_format is not None: video_url = \'%s%s\' % (video_url, const_video_url_format_suffix % video_format) # Check conflicting options if cmdl_opts.outfile is not None and (cmdl_opts.simulate or cmdl_opts.get_url): sys.stderr.write(\'Warning: video file name given but will not be used.\\n\') if cmdl_opts.outfile is not None and (cmdl_opts.use_title or cmdl_opts.use_literal): sys.exit(\'Error: using the video title conflicts with using a given file name.\') if cmdl_opts.use_title and cmdl_opts.use_literal: sys.exit(\'Error: cannot use title and literal title at the same time.\') if cmdl_opts.quiet and cmdl_opts.get_url: sys.exit(\'Error: cannot be quiet and print final URL at the same time.\') # Incorrect option formatting if cmdl_opts.username is None and cmdl_opts.password is not None: sys.exit(\'Error: password give but username is missing.\') if cmdl_opts.use_netrc and (cmdl_opts.username is not None or cmdl_opts.password is not None): sys.exit(\'Error: cannot use netrc and username/password at the same time.\') if cmdl_opts.get_url is None and cmdl_opts.get_title is not None: sys.exit(\'Error: getting title requires getting URL.\') # Get account information if any account_username = None account_password = None if cmdl_opts.use_netrc: try: info = netrc.netrc().authenticators(\'youtube\') if info is None: sys.exit(\'Error: no authenticators for machine youtube.\') account_username = info[0] account_password = info[2] except IOError: sys.exit(\'Error: unable to read .netrc file.\') except netrc.NetrcParseError: sys.exit(\'Error: unable to parse .netrc file.\') else: account_username = cmdl_opts.username if account_username is not None: if cmdl_opts.password is None: account_password = getpass.getpass(\'Type YouTube password and press return: \') else: account_password = cmdl_opts.password # Get output file name if cmdl_opts.outfile is None: video_filename = \'%s%s\' % (video_url_id, video_extension) else: video_filename = cmdl_opts.outfile # Install cookie and proxy handlers urllib2.install_opener(urllib2.build_opener(urllib2.ProxyHandler())) urllib2.install_opener(urllib2.build_opener(urllib2.HTTPCookieProcessor())) # Log in and confirm age if needed if account_username is not None: url = const_login_url_str % video_url_id post = const_login_post_str % (video_url_id, account_username, account_password) download_step(False, \'Logging in\', \'unable to log in\', url, post) url = const_age_url_str % video_url_id post = const_age_post_str % video_url_id download_step(False, \'Confirming age\', \'unable to confirm age\', url, post) # Retrieve video webpage video_webpage = download_step(True, \'Retrieving video webpage\', \'unable to retrieve video webpage\', video_url) # Extract video title if needed if cmdl_opts.use_title or cmdl_opts.use_literal or cmdl_opts.get_title: video_title = extract_step(\'Extracting video title\', \'unable to extract video title\', const_video_title_re, video_webpage) # Extract needed video URL parameters video_url_t_param = extract_step(\'Extracting URL \"t\" parameter\', \'unable to extract URL \"t\" parameter\', const_url_t_param_re, video_webpage) video_url_real = const_video_url_real_str % (video_url_id, video_url_t_param) if video_format is not None: video_url_real = \'%s%s\' % (video_url_real, const_video_url_format_suffix % video_format) # Rebuild filename if needed if cmdl_opts.use_title or cmdl_opts.use_literal: if cmdl_opts.use_title: prefix = title_string_norm(video_title) else: prefix = title_string_touch(video_title) video_filename = \'%s-%s%s\' % (prefix, video_url_id, video_extension) # Check name if not video_filename.lower().endswith(video_extension): sys.stderr.write(\'Warning: video file name does not end in %s\\n\' % video_extension) # Retrieve video data try: cond_print(\'Requesting video file... \') video_data = perform_request(video_url_real) cond_print(\'done.\\n\') cond_print(\'Video data found at %s\\n\' % video_data.geturl()) if cmdl_opts.get_title: print video_title if cmdl_opts.get_url: print video_data.geturl() if cmdl_opts.simulate or cmdl_opts.get_url: sys.exit() try: video_file = open(video_filename, \'wb\') except (IOError, OSError): sys.exit(\'Error: unable to open \"%s\" for writing.\' % video_filename) try: video_len = long(video_data.info()[\'Content-length\']) video_len_str = format_bytes(video_len) except KeyError: video_len = None video_len_str = \'N/A\' byte_counter = 0 block_size = const_initial_block_size start_time = time.time() while True: if video_len is not None: percent = float(byte_counter) / float(video_len) * 100.0 percent_str = \'%.1f\' % percent eta_str = calc_eta(start_time, time.time(), video_len, byte_counter) else: percent_str = \'---.-\' eta_str = \'--:--\' counter = format_bytes(byte_counter) speed_str = calc_speed(start_time, time.time(), byte_counter) cond_print(\'\\rRetrieving video data: %5s%% (%8s of %s) at %8s/s ETA %s \' % (percent_str, counter, video_len_str, speed_str, eta_str)) before = time.time() video_block = video_data.read(block_size) after = time.time() dl_bytes = len(video_block) if dl_bytes == 0: break byte_counter += dl_bytes video_file.write(video_block) block_size = new_block_size(before, after, dl_bytes) if video_len is not None and byte_counter != video_len: error_advice_exit(\'server did not send the expected ammount of data\') video_file.close() cond_print(\'done.\\n\') cond_print(\'Video data saved to %s\\n\' % video_filename) except (urllib2.URLError, ValueError, httplib.HTTPException, TypeError, socket.error): cond_print(\'failed.\\n\') error_advice_exit(\'unable to download video data\') except KeyboardInterrupt: sys.exit(\'\\n\') # Finish sys.exit()

10 thoughts on “Python program to download youtube video — written by Ricardo Garcia Gonzalez”

  1. Er leckte an meinen feuchten Schamlippen, worauf ich zu stöhnen begann. Mit seiner Zunge drang er nun in mich ein, stimulierte meinen geilen Punkt, dass ich glaubte zu zerschmelzen. Ich genoss es, wie er mein kleines Loch ausschleckte.