If you’ve ever tried to open an M4A or MP4 file in Audacity on your Mac and were met with an "Advanced Audio Coding file" error, you’re not alone. To handle these formats, Audacity requires an external library called .
Directly importing the audio track from most video files (e.g., MP4, MOV).
Because of patent restrictions, this library is not included in the standard Audacity download. This guide explains how to download and install FFmpeg to unlock full import and export capabilities on macOS.
