2017-11-30 11:52 GMT+01:00 Kieran O Leary <kieran.o.le...@gmail.com>:
> With some formats, pieces of metadata like 'encoded date',

Iirc, we don't do that (not even for formats requesting it)
because it is considered a security issue.
(I may misremember though.)

> or perhaps a unique ID can be written.

This is what ogg requires and is done.

Carl Eugen
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