Libraries Preferences
From Audacity Manual
MP3 Export Library
This optional library allows Audacity to export MP3 files.
- MP3 Export Library Version: This shows the current version of the LAME MP3 encoding library being used by Audacity for MP3 export. If a suitable version of LAME is not accessible to Audacity, the message will instead state that the library is "not found". In that case, use the provided buttons to either locate LAME on your computer or download a free copy of it, following the instructions on the LAME MP3 page.
- Locate: If you already have the LAME library on disk and Audacity can't find it, use this button to tell Audacity where it is.
- Download: Use this to fetch a copy of the LAME library.
FFmpeg Import/Export Library
This optional library allows Audacity to import and export many additional audio formats such as AC3, AMR(NB), M4A and WMA, and to import audio from video files.
- FFmpeg Library Version: This shows the current version of the FFmpeg library being used by Audacity for custom export. If a suitable version of FFmpeg is not accessible to Audacity, the message will instead state that the library is "not found". In that case, use the provided buttons to either locate the FFmpeg library on your computer or download a free copy of it, following the instructions on this page.
- Locate: If you already have the FFmpeg library on disk and Audacity can't find it, use this button to tell Audacity where it is.
- Download: Use this to fetch a copy of the FFmpeg library.
