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()

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imap aa <Esc>80i-<Esc>i<Esc>o

Just put this in the vimrc or in a vi session with a : in normal mode.

Explanation:

This will map the key \”aa\” to the sequence which will add \”-\” 80 times in the current line and then go to new line in insert mode. This is quite simple so any changes required should be simple enough to make.

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