[theora-codecs] theora ultra low bitrate support (vp3 style)

[dan miller]

I suspect all these issues have to do with scaling code in QT.  It's very hairy how QT and the
codec negotiate colorspaces and such.  The VP3 code never changed re: optimization, it's virtually
the same code in every release.

--- Blibbler <blibblelibby at black-market-babies.com> wrote:
> No. The "QT6 bug" only affects VP3 when you are scaling video on 
> playback. It does not come into effect when you are playing back the 
> video at 100% of the size.
> 
> Colin.
> 
> On Monday, June 16, 2003, at 01:02  AM, dan miller wrote:
> 
> > if the old codec has the "QT6" bug, does that mean you're running it 
> > under QT5?  Quicktime 6
> > definitely has performance issues itself.
> >
> > --- Colin Mckellar <c.mckellar at student.murdoch.edu.au> wrote:
> >> Its is a G4/350 AGP.
> >>
> >> I wouldn't note it, except I can play a few movies smoothly I have 
> >> with
> >> this old codec, which I can't with the new one.
> >>
> >> Colin.
> >>
> >> On Sunday, June 15, 2003, at 01:25  AM, Mauricio Piacentini wrote:
> >>
> >>> This was reported by Colin before, but to be honest I could not
> >>> reproduce
> >>> his results. It looks like it could be a preprocessing threshold 
> >>> issue
> >>> (he
> >>> mentioned it was happening on a Beige G3 I believe), but in my test
> >>> machines
> >>> I get the same decoding performance.
> >>>
> >>> Regards,
> >>> Mauricio
> >>>
> >>>
> >>>> The "fast" vp3 codec I have is one I got when I purchased the OSX
> >>>> quicktime version (before it was open sourced.) Unfortunately, it is
> >>>> affected by the QT6 bug. Released versions since it was open sourced
> >>>> have been much slower at decoding. The latest version doesn't seem 
> >>>> to
> >>>> have a QT6 problem, but it decodes generally much slower than the
> >>>> older
> >>>> one that I have (when decoding without scaling.)
> >>>>
> >>>> The url for a sit file of the older codec can be found:
> >>>> <http://mornmist.2y.net/~blibbler/On2_VP3OSX.sit>
> >>>>
> >>>> The newer codecs seem to encode faster than this one, and there are
> >>>> slightly different results with decoding psnr numbers, but nothing
> >>>> that
> >>>> should justify the difference in decoding speed.
> >>>
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