Check if we have already downloaded a video

script.rb

@@ -30,6 +30,9 @@ videos=DB[:videos]
 open(options[:feed]) do |rss|
     feed=RSS::Parser.parse(rss)
     feed.items.each do |item|
+        if not DB[:videos].where(:url => "#{item.link}").count.eql? 0
+            next
+        end
         video=YoutubeDL.download "#{item.link}"
         videos.insert(:url => "#{item.link}",
                       :filename => "#{video.filename}",