We can not fetch videos from this type of page.
Your URL was: http://loop.php?v=Cu101dw7uc8
http://loop.php?v=Cu101dw7uc8
The URL must be like http://www.youtube.com/watch?v=KPtX7hak0Qs
http://www.youtube.com/watch?v=KPtX7hak0Qs
https://www.
pwn
Example: