We can not fetch videos from this type of page.
Your URL was: http://save-video.mp4?http%3A%2F%2Fv7.lscache1.googlevideo.com%2Fvideoplayback%3Fid%3Def07026f4096ede1%26itag%3D18%26sparams%3Did%252Cexpire%252Cip%252Cipbits%252Citag%26ip%3D174.36.175.210%26signature%3D98AEC08F57ABA5FCB5D35C46F3881FCBA15D2FAA.A94F564C1DCDC57FCD6B5F5BB715429462025725%26sver%3D3%26expire%3D1240771253%26key%3Dyt1%26ipbits%3D0
The URL must be like http://www.youtube.com/watch?v=KPtX7hak0Qs
https://www.
and replace with pwn
Example: