[theora-dev] Re: Ogg IETF standard (was: Re: [vorbis-dev] application/ogg statusupdate)

Michael Smith msmith at xiph.org
Tue Nov 19 00:00:42 PST 2002

At 04:03 PM 19/11/2002 +1100, Silvia.Pfeiffer at csiro.au wrote:
>Hmm, I know what you mean. I've actually taken these sentences out of
>Monty's specifications. The first one refers to the page size of max.
>~64 kByte and the second one to the logical subdivision of packets into
>segments of 255 Byte size. I'm not sure how to rephrase that properly
>though. Maybe it's good as it stands: that it is recommended to have 4-8
>kByte size, but expected more commonly to be 50-200 Byte? I'm not
>experienced enough to make anyone of these statements. Monty, your take?

Ogg is designed for an nominal page size of 4-8 kB (libogg will use
pages of just over 4 kB usually), so the 4-8 kB figure refers to
nominal _page_ size. For latency reasons, constraining this to a
reasonably low figure (rather than the 64 kB maximum, or close to that)
is reasonably important, so this should stay (after being corrected,
of course). 

The packet size figure as given (50-200 bytes) is also correct, but not
as important, since this is a design justification rather than a
recommendation for usage.


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