: The ability to import and extract audio from MP4, MOV, and AVI video files.
The file ffmpeg.55.64bit.dylib is a 64-bit dynamic library for macOS required by and other media applications to import and export advanced audio and video formats. Because of software patents, Audacity cannot package this library directly, making a separate download necessary for full functionality. Why You Need ffmpeg.55.64bit.dylib ffmpeg.55.64bit.dylib download
Without this library, your media software may be limited to standard formats like WAV and AIFF. Installing the 64-bit dylib enables: : Support for M4A (AAC), AC3, AMR, and WMA. : The ability to import and extract audio
: This specific version is essential for 64-bit macOS systems (High Sierra and later) and universal builds. How to Safely Download and Install FFmpeg on Audacity for Big Sur 11.0 M1 chip - macOS Why You Need ffmpeg