AVI is the container most digital camcorders, older webcams, and legacy screen-recording software from the 2000s and early 2010s defaulted to, which means a huge amount of family footage, recorded meetings, and old webinar captures still sit around as .avi files today. Often the video itself is no longer needed — what you actually want is just the audio: a toast from a wedding video, the audio of an old conference call, or a song that was filmed off a TV or radio. Pulling audio out of a video container is called demuxing, and unlike converting video to video, it does not require touching the picture at all.
This tool reads the audio stream already inside your AVI file — commonly stored as uncompressed PCM, ADPCM, or MP2/MP3 by older encoders — and re-encodes it as a clean MP3 using the industry-standard libmp3lame encoder at VBR quality level 2, which targets roughly 190 kbps and is generally considered transparent or very close to it for most listeners. The video track is discarded entirely, which is also why extraction is much faster than a full video conversion: FFmpeg never has to decode a single video frame, only the audio samples.
Have a different video format instead of AVI? The general-purpose Extract Audio tool accepts any video file, or use MP4 to MP3 directly if that's your source format.
