Extract Audio from Video

A video file is a container holding separate streams: at minimum one video stream and one audio stream, each compressed with its own codec. Extraction opens the box, lifts out the audio stream and re-packs it on its own.

The audio inside most videos is AAC at somewhere between 128 and 256 kbps. Flippy encodes your MP3 from that track directly, so you keep everything it had: and, honestly, nothing more. An extracted MP3 cannot sound better than the track it came from.

Planning to edit the audio afterwards? Grab a WAV from the converter instead. Editing a lossy file and re-exporting it lossy stacks two generations of compression; WAV gives your editor a clean intermediate.

The classics: turning a recorded interview or webinar into something you can listen to on a commute, pulling the lecture out of a screen recording, lifting the podcast episode out of its video version, and shrinking a recording before feeding it to a transcription tool, which needs the sound and none of the pixels.

The size argument is dramatic. An hour of 1080p video easily runs into gigabytes; its soundtrack as an MP3 is around 60 MB, small enough for a phone, an email thread or a shared drive without anyone groaning. When the pictures were only ever a container for the words, extraction is the whole compression strategy.

One habit worth keeping: extract once, from the original video. Every lossy re-encode shaves a little detail, so an MP3 made from the source beats an MP3 made from a compressed re-upload of it. And if the audio is headed into an editor rather than a player, take WAV from the converter instead and save the lossy step for the final export.