Develop function that converts only AAC audio file format

[JimmyDiamond]

Hello there!

I want to ask a question that, I would like to have a function in VLC that convert from MP3 or MP4 or Flac etc to Advanced Audio Coding (AAC). I saw that already have a fucntion that converts file format to MPEG4 which is video and audio file format at the same time, but I only need AUDIO AAC format without video.
Is it possible to develop that?

Best regards JimmyDiamond.

[Rémi Denis-Courmont]

Use raw muxer instead of mp4 ?

[JimmyDiamond]

Use raw muxer instead of mp4 ?

Is it a command line function ? I've never heard of it, what should i do to ? Could you explain it? If I was not understantable, my purpose is that, im downloading music with different file formats, most commonly mp3 or rarely mp4, if there is any way to convert it as AAC i would like to know it. Then i want to write it out to an AUDIO CD. I know its 2021 and nobody use it but I need it.