Open the FFmpeg installer file and run the setup.Click on the download link of the executable file (.exe) for FFmpeg as shown below: Open your browser and download the FFmpeg libraries for your Audacity.A user is required to download this library from the internet so that it can provide the DLL file to Audacity. There is no ‘ avformat-55.dll‘ file in the Audacity folder. If you open the FFmpeg library in preference of Audacity, it will ask to locate the ‘ avformat-55.dll‘ file to make this library work. However, some libraries like FFmpeg will still require the installation in Audacity. The formats that require this library are M4A (AAC), AMR, WMA, and AC3.
The FFmpeg library allows Audacity to import and export large audio files. Most of the libraries are already built-in with Audacity.
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