[ogg-dev] non-decreasing granulepos

[Silvia Pfeiffer]

OK - I have put a ticket into trac for the Ogg RFC. This needs to go in.
https://trac.xiph.org/ticket/1306

Cheers,
Silvia.

On Feb 19, 2008 9:40 PM, <xiphmont at xiph.org> wrote:

> On Feb 19, 2008 5:31 AM, Conrad Parker <conrad at metadecks.org> wrote:
>
> >   * The seeking algorithm suggested in the (troublesome) email quoted at
> > http://wiki.xiph.org/index.php/GranulePosAndSeeking is "find the
> > earliest page with a granulepos less than but closest to 'x'" should
> > be able to handle equal granulepos (if the earliest of a sequence of
> > pages with equal granulepos is taken to be the first of those in the
> > stream).
>
> Correct.  Actually, the algo I had in mind was 'granulepos with a
> mapped time less than but closest to', but that requires the
> no-continued packets fix.
>
> >
> >   * The draft mapping for Ogg Dirac uses successive equal granulepos,
> > as the packets occur in coded order, not display order:
> >
> > http://wiki.xiph.org/index.php/OggDirac#Granulepos
> >
> > This is consistent with the definition of granulepos as the "count of
> > decodable frames".
>
> Correct.
>
> > I suggest we clarify that the granulepos of successive pages is
> > allowed to be equal, as this is non-obvious from the available
> > documentation.
> >
> > Thoughts?
>
> Full agreement.
>
> Monty
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