🎵 Video to MP3 — Extract Audio

Two things I should have done from the start. My own guide told you to "trim the video first" if you only wanted part of it — and there was nothing on this site to trim with. Now there's a From and a To box (type 1:23, or play the video to the spot and press Now), the page tells you how long the part is, and the file is named after it. And a video with more than one audio track — a film with a second language, a recording with a commentary — used to give you whichever track FFmpeg picked — the one marked default, or if none was, the one with the most channels (often the dub) — and the others were out of reach. Now there's an Audio track list with each track's language and name, starting on the one a player would play.

I found something I didn't like: an MP3 made from a phone video carried the video's GPS position and the phone model inside it, because FFmpeg copies every tag it finds into the MP3. Now the audio keeps only what describes the recording — title, artist and the day it was recorded — and the page tells you when it left location or device tags out. And M4A has a new "Original" choice (it starts there): phone videos already have AAC sound, so it's copied as it is instead of being encoded a second time. Nothing lost, and it's done in a moment.

There's a Cancel button while the audio is being extracted. It stops at once, keeps your video and the format you picked, and Extract starts again from scratch. New video and leaving the page stop a running extraction too.

A video recorded in the browser (screen recordings, webcam clips) doesn't store its length, so the bar here used to say "0%" until the audio was suddenly ready. When there's no real percentage it now counts the seconds and how far into the video it has got. I also checked the files themselves: MP3, M4A and WAV all come out the same length as the video, and a 5.1 surround movie gives you a normal stereo MP3.