Ruby on Rails

Does anyone know the right approach to change the duration/length of
an uploaded mp3 file? User has the option to upload mp3 file as full,
30 secs or 90 secs. So far, I have gotten it to work for full.

Do I have to use a processor (with ffmpeg) for this? Or is there a
built-in option in paperclip for this to happen?

Tried googling around to no avail....

By the way, if user selects 90 secs (for example), then I need
Paperclip not to upload the original. The same goes for 30 secs. In
theory, its one file or the other.

Your suggestions / feedback are welcome

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