We can not fetch videos from this type of page.
Your URL was: http://save-video.mp4?http%3A%2F%2Fv12.lscache7.googlevideo.com%2Fvideoplayback%3Fid%3D05342284689360a7%26itag%3D18%26sparams%3Did%252Cexpire%252Cip%252Cipbits%252Citag%26ip%3D174.36.175.210%26signature%3D1261B56D72F92AFE4D2BCA1C3A4C1621024D51C4.5E4DC058B3CE25255B7BA8F70A97A297546B7751%26sver%3D3%26expire%3D1240769671%26key%3Dyt1%26ipbits%3D0
The URL must be like http://www.youtube.com/watch?v=KPtX7hak0Qs
https://www.
and replace with pwn
Example: