[vorbis] Comment field spec needs to be expanded and tightened

[Moritz Grimm]

> > Legally, composer and author are the same, and if an arranger creates
> > something new with the given material, he also is an adequate author
> > (although he might have to pay licensing fees for the material he
> > used). My suggestion would be to keep that one AUTHOR tag and maybe
> > introduce a CREDITS tag for the remaining contributors in the creation
> Perhaps it make sense in this context:  Suppose the tags for my
> large classical collection are copied into an indexed and
> searchable database.  The distiction would be very important to me.

Okay, this is where you need it. Someone else might need completely
different tags like DRUMMER, GUITAR and VOCAL ... I still think that
regulating relatively rare special cases would make users feel
patronized. Noone keeps you from defining these tags for your own.

> > Those are all tags that can be defined by the user if necessary.
> Yes, but sometimes it's better to guide the user.

I rather prefer "free tags to a free world". :) Defining and
standardizing of tags for any possible use of .OGG is not necessary.

[LENGTH tag]
> > Werd, all the players I used for playing any musical format on the
> > computer or my CD-Player knew the total length by themselves. Why
> > introduce a tag? Only for the Napster guys who need to know whether
> > they got an incomplete download or not? Naaahh...
> You might perhaps be a little short-sighted.  The ogg vorbis format
> might outlive audio CDs.  Music distribution is already changing.

This has nothing to do with the capability of every player I know to
calculate the precise length of any not-streamed digital format. If you
wish to tautological store the playing time of your music, define your
own tag.

Moritz

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