Removal of Libraries Preferences

Some Linux distributions or versions thereof may package Audacity with MP3 encoding and FFmpeg support already linked dynamically to the relevant system libraries. In these packaged builds there is no need to locate LAME or FFmpeg, so Audacity will have no "Libraries" Preferences.
Users compiling Audacity from source code can similarly remove the "Libraries" Preferences by configuring Audacity with --disable-dynamic-loading then build Audacity linked to system LAME and to a system (or local) version of FFmpeg 1.2 to 2.3.x or libav 0.8 to 0.10.x.

Locating the FFmpeg library manually

If you installed FFmpeg while Audacity was running, or if you installed FFmpeg to a non-default location, Audacity will ask you to configure Preferences to locate the FFmpeg library. To do this, access Preferences then the "Libraries" tab on the left:
Preferences Libraries notFound basic7.png
As seen in the image above, the "FFmpeg Library Version" will say "not found". To correct this:
  1. Click the Locate... button to right of FFmpeg Library:.
  2. If a "Success" message indicates Audacity has now automatically detected valid FFmpeg libraries and asks if you want to detect them manually, click No, then OK to close Preferences.
  3. If the "Locate FFmpeg" dialog appears, click Browse....
  4. Navigate to the avformat file in the folder that contains FFmpeg, and select it. The file may have different names, such as "avformat-55.dll" on Windows, "libavformat.55.dylib" on Mac or "libavformat.so.55" on Linux.
  5. Click Open then OK and OK again to close Preferences.
FFmpeg Library Version should now show a set of three version numbers for the sub-libraries of FFmpeg ("F" for libavformat version, "C" for libavcodec version and "U" for libavutil version). If you still see "not found", you may have installed the wrong libraries. Click the Download... button to obtain the correct library for your operating system. You can also choose Help > Show Log... to see diagnostic information about FFmpeg detection.

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