Download NSScreencast videos for offline viewing in a batch

download-nsscreencast.rb

# Using this script downloads ALL the videos in NSScreencast.
# Use it wisely, it's extra load/bandwidth for the NSScreencast website.
# Usage: `EMAIL=your email PASSWORD=your password COUNT=how many videos should be downloaded? ruby download-nsscreencast.rb`
 
require "mechanize"
require "parallel"
 
mechanize = Mechanize.new
mechanize.post("https://www.nsscreencast.com/user_sessions", {"email" => ENV["EMAIL"], "password" => ENV["PASSWORD"]})
mechanize.pluggable_parser.default = Mechanize::Download
 
count = ENV["COUNT"].to_i
Parallel.each((1..count)) do |idx|
    begin
        video_url = "http://www.nsscreencast.com/episodes/#{idx}.mp4"
        puts "Downloading #{video_url}"
 
        video = mechanize.get(video_url)
 
        raw_filename = File.basename(video.uri.path)
        episode_number = raw_filename.split("-")[0].gsub("ns", "").gsub("nss", "").to_i
        episode_name = raw_filename.split("-").drop(1).map(&:capitalize).join(" ")
 
        video.save("videos/##{episode_number} - #{episode_name}")
        puts "Saved #{video_url}"
    rescue
        puts "Couldn't save #{video_url}"
    end
end