Retrieve all videos added to all playlists by YouTube user - api

Question

I've hit a wall with the way I would like to use the YouTube data API. I have a user account that is trying to act as an 'aggregator', by adding videos from various other channels into one of about 15 playlists, based on categories. My problem is, I can't get all these videos into a single feed, because they belong to various YouTube users. I'd like to get them all into a single list, so I could sort that master list by most recent and most popular, to populate different views in my web app.
How can I get a list of all the videos that a user has added to any of their playlists?
YouTube must track this kind of stuff, because if you go into the "Feed" section of any user's page at `http://www.youtube.com/' it gives you a stream of activity that includes videos added to playlists.
To be clear, I don't want to fetch a list of videos uploaded by just this user, so http://gdata.../<user>/uploads won't work. Since there are a number of different playlists, http://gdata.../<user>/playlists won't work either, because I would need to make about 15 requests each time I wanted to check for new videos.
There seems to be no way to retrieve a list of all videos that a user has added to all of their playlists. Can somebody think of a way to do this that I might have overlooked?

Answer 1

Something like this for retrieving youtube links from playlist. It still need improvements.
import urllib2
import xml.etree.ElementTree as et
import re
import os
more = 1
id_playlist = raw_input("Enter youtube playlist id: ")
number_of_iteration = input("How much video links: ")
number = number_of_iteration / 50
number2 = number_of_iteration % 50
if (number2 != 0):
number3 = number + 1
else:
number3 = number
start_index = 1
while more <= number3:
#reading youtube playlist page
if (more != 1):
start_index+=50
str_start_index = str(start_index)
req = urllib2.Request('http://gdata.youtube.com/feeds/api/playlists/'+ id_playlist + '?v=2&&start-index=' + str_start_index + '&max-results=50')
response = urllib2.urlopen(req)
the_page = response.read()
#writing page in .xml
dat = open("web_content.xml","w")
dat.write(the_page)
dat.close()
#searching page for links
tree = et.parse('web_content.xml')
all_links = tree.findall('*/{http://www.w3.org/2005/Atom}link[#rel="alternate"]')
#writing links + attributes to .txt
if (more == 1):
till_links = 50
else:
till_links = start_index + 50
str_till_links = str(till_links)
dat2 = open ("links-"+ str_start_index +"to"+ str_till_links +".txt","w")
for links in all_links:
str1 = (str(links.attrib) + "\n")
dat2.write(str1)
dat2.close()
#getting only links
f = open ("links-"+ str_start_index +"to"+ str_till_links +".txt","r")
link_all = f.read()
new_string = link_all.replace("{'href': '","")
new_string2 = new_string.replace("', 'type': 'text/html', 'rel': 'alternate'}","")
f.close()
#writing links to .txt
f = open ("links-"+ str_start_index +"to"+ str_till_links +".txt","w")
f.write(new_string2)
f.close()
more+=1
os.remove('web_content.xml')
print "Finished!"