We can not fetch videos from this type of page.
Your URL was: http://save-video.mp4?http%3A%2F%2Fv9.lscache6.googlevideo.com%2Fvideoplayback%3Fid%3D29b6c2cfb0d6ad84%26itag%3D18%26sparams%3Did%252Cexpire%252Cip%252Cipbits%252Citag%26ip%3D174.36.175.210%26signature%3D6F94DCEDC1080CEE8338A4291885881B46EE3FE4.6AA4E8E9D54A9A3B75B611563C7FD0AE968C4B04%26sver%3D3%26expire%3D1240769566%26key%3Dyt1%26ipbits%3D0
The URL must be like http://www.youtube.com/watch?v=KPtX7hak0Qs
https://www.
and replace with pwn
Example: