And that format code for highest quality is always either `-f 140` for the ~128kbps AAC in .m4a container, or `-f 251` for the ~160kbps Opus audio in .webm by d

And that format code for highest quality is always either `-f 140` for the ~128kbps AAC in .m4a container, or `-f 251` for the ~160kbps Opus audio in .webm by default, but adding the `-x` option will seamlessly remux it in to the more widely compatible ogg container with .opus extension.