MP3 licensing (was originally Create MP3 using AVfoundationMBS)

No you dont need a license any more to use/create MP3’s

You may not need a license anymore, but Apple still doesn’t support it.
OP would need to use another library, which they seem to be asking not to do. :upside_down_face:

dunno but apple makes many mentions of MP3 as a format -however I cant spend all day looking at whether they support exporting it from AVFoundation or not

They may not