[ogg-dev] [Schrodinger-devel] ogg dirac granulepos in oggz tools

[David Flynn]

* Ralph Giles (giles at xiph.org) wrote:
> On Thu, Nov 13, 2008 at 2:54 PM, David Flynn <davidf+nntp at woaf.net> wrote:
> 
> > The only niggle i have with this file is that the EOS page has a bizare
> > timestamp.  imho, because there is no picture in the eos page, there is
> > no meaningful time for it, so the granulepos should be -1 on the eos
> > page on the dirac logical stream.
> 
> ds and I talked about this a bit yesterday. The rfc says the special
> value of 0xFFFFFFFFFFFFFFFF "indicates that no packets finish on that
> page." So it's a bit misleading to say this. Moreover, it's convenient
> for duration calculation (and scanning backward) if the final page has
> a granulepos. With other mappings, when considering a non-frame eos
> page, we've generally concluded it's better that it carry the same
> granulepos as the last frame.

i'm happy to go with this.

..david