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

[Mauricio Piacentini]

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

<p>> 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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