Ferrocast Install

WebM to MP4 on your Mac, without uploading

Convert WebM files to MP4 with Ferrocast. The conversion runs on your Mac and the result is saved next to the original.

How to convert WebM to MP4

  1. Install Ferrocast (below).
  2. Drag your WebM file, or select it in the launcher.
  3. Tap ⇧ for the conversion wheel (or press ⌥↵ on a file result).
  4. Release over MP4. 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 WebM 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.