Hi!
This is a little tricky. Mp3 format does not specify how to send metadata.
Thus, there has been many layers added over the years, id3v1, id3v3, etc..
For streaming with icecast, the format for metadata was introduced in the
antiquity of the internet by shoutcast, it's explained here:
https://cast.readme.io/docs/icy
> Metadata
> If the client sends the Icy-MetaData:1 header this means the client supports
> ICY-metadata. The server should respond icy-metaint: 8192. 8192 is the number
> of bytes between 2 metadata chunks. It is suggested to use this value as some
> players might have issues parsing other values. In these chunks
> StreamTitle='title of the song'; send the new song title. There also is a
> StreamURL field which should be able to also send album art links or more
> info. The exact implementation is however unknown.
As you can see, the only fields accepted is are title and url. Most client
split the title along the format `$(title) - $(artist)` or something like that
but this is not reliable.
Long story short: I'm afraid that passing specifically a `COMMENT` tag won't be
possible. Alternatives would be to pass this comment tag inside the title or
artist . Alternatively, you can use formats with more structured support for
metadata such as any one using the `ogg` container.
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