If you ever need to know if an image is portrait or landscape in orientation, you can do the following (assuming you have an orientation attribute on your model:
class Image < ActiveRecord::Base
# Paperclip
has_attached_file :file

# Callbacks
before_create :set_orientation

protected

def set_orientation
original_file = self.file.to_file(:original)
[...]

So you’ve installed FFMPEG. Now it’s time to move onto converting the video. For this we’re going to be using a couple of plugins.
Paperclip
We will be using the paperclip plugin to upload the videos onto our server. Details of how to install paperclip can be found in my previous article: Paperclip: Attaching Files in Rails. [...]