Ruby on Rails

After understanding the tutorial:
https://www.pubnub.com/blog/2015-12-08-building-video-sharing-app-server-messaging-ruby/
I have a problem.

I need to open ogv and webm files and i get this:

Command :: file -b --mime '...'

looking for a solution to this problem, I read that is necessary to add
the audio format in mime_types.rb.

Mime::Type.register "video/ogg", :ogv
Mime::Type.register "video/webm", :webm

but I still have the same problem. Any solution?
Regards

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