Varicam Slow motion

[David Bogie]

Any of those will work. Your term “best” is meaninglessly relative, so is s”mooth” since you have included free-and-easy as well super expensive options. The choice of method is secondary to your image needs.
if you need it to look like it was shot properly overcranked, there is no option. If you can accept visual compromises, use optical flow.

bogiesan

This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”