[ogg-dev] How Ogg mappings translate into the codecs parameter in Ogg media types

[ogg.k.ogg.k at googlemail.com]

> It's not required as a marker from an Ogg perspectice, since the Ogg
> framing already marks this as the BOS page. Most of the other media
> mappings do without a packet type field. If it's required from a codec
> POV (i.e. for kate), then that's fair enough.

Yes, I need it - I have several types of header packets, and several
types of data packets. These are also used in forward compatibility,
to discard packet types which are not known to the decoder (eg, for
streams encoded by a later decoder when the bitstream format may
have changed).