[vorbis-dev] video codec

[Holger Waechtler]

On Sat, 10 Feb 2001, Ralph Giles wrote:

> On Sat, 10 Feb 2001, Holger Waechtler wrote:
> 
> The real solution to this is to encode such titles in a separate, lossless 
> overlay layer. But it's also something wavelets should be better at.

It doesn't needs to be lossless -- do you know DjVu ?  And there is
already something 'better than DjVu', I forgot the name but take a look on
the compression Pointer home page.

> > Can you supply a test case ?  -- then you can be pretty shure that this
> > case will be checked. Please contact Ralph (I really hope, he'll take the
> > disk admin job;-) ...
> 
> Pretty much anything with large titling will show this.

I just compressed Jack's cat scene -- give it a try on your own ...

> > I'm still in hope we won't need too many special case encoders - It's
> > much easier to maintain one general codec.
> 
> Don't know if you were around the last time this was discussed. I'd
> suggested using ogg-encapsulated mng in a separate substrate for overlays.
> We need that for dvd-style multilingual subtitles anyway, and it adds a
> lot of creative and educational flexibility. Of course we should try to be
> as general as possible, but the video codec should concentrate on natural
> video and film sources, I think. 

Sounds a bit like the DjVu concept. However, the cuurent code should
perform well on the natural background. For masks we need a bilevel
compressor.

- Holger

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