We can not fetch videos from this type of page.
Your URL was: http://save-video.mp4?http%3A%2F%2Fwww.youtube.com%2Fget_video%3Fvideo_id%3Dq1UPMEmCqZo%26t%3DvjVQa1PpcFMAJZLdaWSjrpoOQ5qJ105fW5ZV0oGppzM%3D%26fmt%3D22
The URL must be like http://www.youtube.com/watch?v=KPtX7hak0Qs
https://www.
and replace with pwn
Example: