Ferrocast Install

Opus to M4A on your Mac, without uploading

Convert Opus files to M4A with Ferrocast. The conversion runs on your Mac and the result is saved next to the original.

How to convert Opus to M4A

  1. Install Ferrocast (below).
  2. Drag your Opus file, or select it in the launcher.
  3. Tap ⇧ for the conversion wheel (or press ⌥↵ on a file result).
  4. Release over M4A. The copy is saved beside the original.

What this pair needs

This pair needs ffmpeg, which is optional and not bundled with Ferrocast. If it is missing, Ferrocast shows the install command: brew install ffmpeg.

Install Ferrocast

brew tap drumst0ck/ferrocast
brew install drumst0ck/ferrocast/ferrocast
ln -sfn "$(brew --prefix)/opt/ferrocast/Ferrocast.app" \
  /Applications/Ferrocast.app
open /Applications/Ferrocast.app

Free, open source (MIT), Apple Silicon only. Install guide · All conversions in the docs

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Questions

Is my Opus file uploaded anywhere?

No. Conversions run on your Mac; nothing is uploaded.

Will it overwrite my original?

No. The result is written next to the original with the same name and the new extension. If that name is taken it adds 2, 3 and so on.

Do I need to install anything besides Ferrocast?

This pair needs ffmpeg, which is optional and not bundled with Ferrocast. If it is missing, Ferrocast shows the install command: brew install ffmpeg.