Source: https://mactoolbox.app/glossary/ffmpeg

# What is FFmpeg?

By Nikhil Barik · Published November 3, 2026

## Quick answer

FFmpeg is a free, open-source program for converting, cutting and processing audio and video. Many video apps use it behind the scenes.

## What it is

It runs from the command line and can read almost any media format. It is used by many apps and services.

## Why it matters on a Mac

macOS does not include FFmpeg. If you want it in Terminal, Homebrew can install it with brew install ffmpeg.

## How to check it on macOS

In Terminal, run ffmpeg -version. If it prints a version, it is installed.

## How Toolbox handles it

Toolbox uses FFmpeg for video and audio work, including reading MKV and AVI files. If it is not installed, the app can install it in one click with Homebrew.

## Frequently asked questions

**Is FFmpeg free?**

Yes, it is open source.

**Do I need to know commands to use Toolbox?**

No. Toolbox provides the options as buttons and menus.

**Is FFmpeg safe?**

It is widely used. Install it from Homebrew or the official site.

## Tools mentioned

- [**Convert Video**: Change videos to MP4, MOV, WebM or M4V.](https://mactoolbox.app/convert-video-to-mp4-mac)
- [**Compress Video**: Shrink video files while keeping them looking great.](https://mactoolbox.app/compress-video-mac)
- [**Convert Audio**: Change audio files to MP3, M4A, WAV, FLAC or AIFF.](https://mactoolbox.app/convert-audio-to-mp3-mac)

## Keep reading

- [Convert Video](https://mactoolbox.app/convert-video-to-mp4-mac)
- [Compress Video](https://mactoolbox.app/compress-video-mac)
- [Codec](https://mactoolbox.app/glossary/codec)