[Ffmpeg-cvslog] CVS: ffmpeg Changelog,1.58,1.59

[Michael Niedermayer]

Hi

On Thu, Dec 29, 2005 at 07:09:44PM -0800, Mike Melanson wrote:
> Rich Felker wrote:
> >On Thu, Dec 29, 2005 at 09:05:32PM +0100, Erik Slagter wrote:
> >
> >>On Thu, 2005-12-29 at 18:07 +0100, Michael Niedermayer wrote:
> >>
> >>
> >>>big note: lossless jpeg and jpeg ls are 2 different standards! both are
> >>>lossless ...
> >>
> >>BTW how does all of this relate to jpeg with 100% quality? Isn't that
> >>lossless?
> >
> >
> >No. The DCT isn't even specified in a bitexact way so there's no way
> >it can be lossless.
> 
> 	So can someone provide a 50-words-or-less summary of how lossless 
> 	JPEG works? (Michael: Blog post. :) ) Does it involve DCT or some other 
> method for primary compression? 

like huffyuv just more bloated, read the spec if you care, if and only if
the spec isnt understandable i would be willing to write a summary of it
its IMHO a waste of time otherwise ...


> How does its compression rate against, 
> e.g., PNG?

http://www.hpl.hp.com/research/papers/JPEG-LS-LOCO.pdf

or just use google with the names of the codecc you want compared 
(add CALIC and lena to avoid nonsense results)

[...]
-- 
Michael