If you are unable to use MP4-M4A-MOV-ALA file formats on your Audacity program for Windows or Mac, you need to install the FFmpeg library. Without this library you will get a advanced audio coding file error in Audacity when trying to import a MP4-M4A-MOV-ALA file. This error also occurs when you try to drag and drop the video file into Audacity window.

To fix this issue, please follow these steps:

1. Close Audacity if it’s open
2. Download and install latest version of Audacity from this link: Download Audacity
3. Install latest ffmpeg library for Windows Or Mac from this link: Download ffmpeg for Windows or mac
   • Be careful to install “ffmpeg” library not LAME.
4. Start Audacity
5. Drag your video file to Audacity and it should now import without issue

You can also watch the below video that shows you how to install the ffmpeg library in Audacity to fix Audacity Advanced Audio Coding File error: