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

[Blibbler]

I noticed the difference in decoding speed, even with the pre-QT6 safe 
codecs. Were the same compilers used?
In any case, I am not terribly fussed, I am mainly curious about why 
there would be differences in the decode speed.

On Tuesday, June 17, 2003, at 01:13  AM, dan miller wrote:

> 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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