Now download youtube video when you have not a downloader by VLC media player. Here is some steps you take a glance on that
*In VLC go to media and open network
* Now copy your URL from your video-not in browser address bar but on your playing video right click.
URL like this–http://www.youtube.com/watch?feature=player_detailpage&v=pbj5eYGE86M
Get your ad frame
* when video start playing go to tools>codec info. and copy url from location and paste in browser window , Now your video play in browser and then you right click on that and save video as then your video start downlaoding