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from urllib2 import urlopen
from subprocess import Popen, PIPE
from bs4 import BeautifulSoup
import os
 
page = urlopen('http://backboneconf.com')
soup = BeautifulSoup(page)
video_url_list = []
count = 0
 
tags = soup.find_all('div', {'class': 'speaker-entity'})
for t in tags:
    url_page = t.find('a')
    print url_page
    if 'www.youtube.com/watch' in url_page.get('href', ''):
        print url_page
        video_url_list.append(url_page.get('href', ''))
for url in video_url_list:
    print "url->"+url
    p1 = Popen(["youtube-dl", "-F", url], stdout=PIPE)
    p2 = Popen(["grep", "-i", "mp4"], stdin=p1.stdout, stdout=PIPE)
    p3 = Popen(["head", "-n", "1"], stdin=p2.stdout, stdout=PIPE)
    p4 = Popen(["grep", "-o", r"^[0-9]*"], stdin=p3.stdout, stdout=PIPE)
    output = p4.communicate()[0]
    code_format = output.strip()
    print "code-format"+code_format
    videodl = 'youtube-dl -o "%%(title)s.%%(ext)s" --restrict-filenames %s' % (url)
    print "Will download video:" + videodl
    os.system(videodl)