We can not fetch videos from this type of page.
Your URL was: http://save-video.mp4?http%3A%2F%2Fv18.lscache2.googlevideo.com%2Fvideoplayback%3Fid%3D2bc85db2f5bc349c%26itag%3D18%26sparams%3Did%252Cexpire%252Cip%252Cipbits%252Citag%26ip%3D174.36.175.210%26signature%3D49F43633D34853EB57B7B52D5DC4A0DF72C2A024.49ACE69F9E142593AE81EC3E22E3257945904183%26sver%3D3%26expire%3D1239990131%26key%3Dyt1%26ipbits%3D0
The URL must be like http://www.youtube.com/watch?v=KPtX7hak0Qs
https://www.
and replace with pwn
Example: