[FFmpeg-devel] jframe

[Dominik 'Rathann' Mierzejewski]

On Thursday, 07 June 2007 at 16:06, Reimar D?ffinger wrote:
> Hello,
> On Thu, Jun 07, 2007 at 11:47:40AM +0200, Reimar D?ffinger wrote:
> > On Wed, May 30, 2007 at 10:59:54PM +0200, matthieu castet wrote:
> > > > On Wed, May 30, 2007 at 05:30:57PM +0300, Ivan Kalvachev wrote:
> > > >> 2007/5/30, Michael Niedermayer <michaelni at gmx.at>:
> > > >>>
> > > >>>> A google search
> > > >>>> comes up with nothing. How do you know that j-type frames are called 'j-type
> > > >>>> frames'?
> > > >>> we dont, and they are also almost certainly not called j frames by MS
> > > >> They call them X8 (or intra X8).
> > > >> Kostya also said they refer to them in this way in the vc1 advanced profile.
> > > 
> > > There also a callgraph of the MS codec : 
> > > http://multimedia.cx/eggs/images/dcng-frame18-callgraph.png
> > 
> > Does someone know details about the (Local?)Huffman stuff that X8 uses?
> > Is this in use in some other places as well? Is there maybe even already
> > some code somewhere?
> > I hate huffman so I don't really want to play with that *g*
> 
> Still in the hope that someone else might be doing the work ;-):
> attached are the arrays with the huffman code lengths that wmv2 J-Frames
> uses (not sure all are really used) in a sanitized form (decoder stores 2
> per byte and with -1 offset).
> There are codes for values 0..11, 0..76 and 0..33.

Cool. Wikified. I hope you don't mind.

Regards,
R.

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