Output encoder "none" does not work with librosie
It causes match() to fail.
An output encoder must return something (in a byte array) in order to signal that a match occurred, so perhaps the "none" encoder is useless with librosie. In that case, librosie should reject it.
An idea for a related output encoder is "bool" (or some other name) which returns something to indicate a match, and no match otherwise. A single byte, as opposed to no bytes, is enough to signal a match. "none" was not meant for this purpose; it was meant to skip output encoding completely, for testing purposes.