[vorbis] Video codec

[Sean Wieland]

Monty wrote:
> 
> I don't chime in on this often, but I think I will here...
> 
> > MPEG-2, at moderate (20:1 [10 Mbps, CBR, 4:2:0] ) to high compression ratios
> > (40:1 [5 Mbps, CBR, 4:2:0] ), creates several kinds of artifacts.  The most
> > noticeable ones are three:
> >
> > 1) Blocking noise (blocks that are 8 or 16 pixels square)
> 
> Due to the nlg(n) nature of the DCT.  Wavelets are linear time transforms and
> so do not require subblocking.
> 
> > 2) "Mosquito" noise (irregular dots around sharp edges, like letters or
> > numbers)
> 
> Due to MDCT and it's non-local quantization artifacts.
> 
> > 2) Low-level DCT noise, crawling dots on flat surfaces
> 
> Same.
> 
> These are the biggest reasons I like wavelets ;-)  No subblocks, all *these*
> problems disappear.
> 
> Monty

All the more reason why I can't wait to see this DWT video codec
developed. :o)

-Sean


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