We can not fetch videos from this type of page.
Your URL was: http://etc%EF%BC%8C%E5%AE%83%E6%9C%83%E5%B8%B6%E4%BD%A0%E5%88%B0%E4%B8%80%E5%80%8B%E9%A0%81%E9%9D%A2%EF%BC%8C%E9%80%A3%E7%B5%90%E5%88%B0%E5%A4%9A%E5%80%8B
The URL must be like http://www.youtube.com/watch?v=KPtX7hak0Qs
https://www.
and replace with pwn
Example: