You can use on_metadata() (or on_track()) to do whatever you want with
the information that interests you. Below are two possibilities: log
with a special label that you can easily filter out, or print to a
dedicated file.
on_metadata(
fun (m) -> log(label="blah",string_of(m)),
some_source)
on_metadata(
fun (m) -> system("echo #{quote(string_of(m))} >> /path/to/sweet.log"),
some_source)
You can also display the metadata m using custom functions that you
like, and so on.
--
David
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