How to convert webm to any other audio format?

Question

PHP

I get a MediaStream object in the browser. Next, using the MediaRecorder, I record and receive a Blob object. MIME-type is always different, depending on the browser. Firefox writes to audio/ogg;codecs=opus (ideally, what you need), and chrome writes to audio/webm; codecs=opus . Depriving users of the site with Chrome is not an option, too high a percentage. How to convert this horrible webm to any audio format (preferably OGG Opus)? with JS or PHP?

Answer 1

run through php some https://ffmpeg.org/ is no problem