[MPlayer-dev-eng] uspp

[Loren Merritt]

On Wed, 11 Jul 2007, Jan Knutar wrote:

> Anyone compared postprocessing mpeg-like material with mpeg-based uspp
> vs snow-based uspp? Wondering a little bit about why it was changed to
> snow :)

In mpeg-uspp, no feature of the input picture can affect any point of 
the output picture more than 8 pixels away. snow-uspp can provide 
arbitrarily large smoothing if needed. result: blocks may still be visible 
after mpeg-uspp just smooths the block edges.
otoh, snow-uspp adds ringing in some places that didn't have ringing in 
the compressed video.

Both would probably benefit from thresholding the transform coefficients 
(like spp/fspp) rather than using full quantization. But then they'd take 
more code than just invoking an existing codec.
If someone does go that route, you could also try using an overcomplete 
wavelet transform instead of repeating the whole encode process at each 
offset.

--Loren Merritt