Download video lectures from NPTEL.

nptel-dl.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'nokogiri'
require 'open-uri'

# FEM
page     = "http://nptel.iitm.ac.in/video.php?subjectId=112106135"
download = "http://npteldownloads.iitm.ac.in/softlinks_mp4/112106135/lec%02d.mp4"

# load page
proxy = ENV["http_proxy"]
doc = Nokogiri(open(page, :proxy => proxy))

# parse lecture titles
titles = doc.search("a").select{|a| a.attr(:name) == 'lectureList'}.map(&:text).map(&:strip)

# download
(1..(titles.length)).each do |i|
  %x|wget -c '#{download % i}' -O '#{titles[i - 1]}.mp4'|
end