Hacking Youtube to find good quality videos

You don't know how to download high quality videos in youtube? then this tutorial will help you to download it. 


Step1: Click to video that you want to see, the link will display on Address bar.
Example:  http://www.youtube.com/watch?v=Ne1l6VNkuLM
Step2: Add &fmt=6 to the end of that string.
That address like:
http://www.youtube.com/watch?v=Ne1l6VNkuLM&fmt=6

Optional Step: To get more