Extract audio from a video

Extracting is not really converting

People say “convert video to audio”, but nothing is converted when it goes well. A video file is a container: a wrapper holding a picture stream and one or more sound streams side by side. Extracting the audio means opening the wrapper, taking the sound stream out and giving it a wrapper of its own. Nothing is decoded, nothing is compressed, nothing is lost — and it takes seconds regardless of how long the video is.

That only works when the target format can legally hold the codec that was in the video. An MP4's AAC soundtrack goes into an .m4a untouched. An old AVI's MP3 soundtrack goes into an .mp3 untouched. A WebM's Opus track goes into an .opus untouched. Ask for anything else and the audio has to be decoded and re-encoded, which costs a little quality and a lot more time. The panel tells you which of the two is about to happen.

What goes in

The extractor reads the containers you actually meet: MP4 and M4V from phones and downloads, MOV from iPhones and Macs, MKV from films and rips, WebM from browsers and OBS, AVI from old camcorders, WMV from old Windows machines, FLV from old downloads, 3GP from very old phones, MPEG, TS and M2TS from broadcast and camcorders, VOB from DVDs, and MXF from professional cameras.

It does not read audio files — an .mp3 or an .m4a is not a video, and our sister site Audio Converter is the right tool for those. The widget says so by name rather than failing at the FFmpeg layer.

The soundtrack you meant, not the first one

This is the difference that matters on real files. A film in an MKV routinely carries three audio streams: the original language, a dubbed version, and a director's commentary. A recording exported from an editor can carry a stereo mix and separate microphone tracks. Almost every online converter takes stream zero and hands it to you, which is how people end up with a perfectly good MP3 of the wrong language.

Here every soundtrack is listed — language, codec, channel layout and bitrate — and you choose. If the file marks one as the default, that is the one preselected, because that is what a player would give you.

When there is no sound at all

Some videos genuinely have no audio stream: screen recordings made without microphone or system audio, security camera clips, GIF-style exports, and time-lapses. Rather than producing a zero-byte file, the extractor says the file has no soundtrack and names the file it means. If you expected sound, play the video first — if it is silent there, there is nothing to recover.