[vorbis-dev] ogg pic format (again).. here's why

Marco Al marco at simplex.nl
Fri Jan 26 16:27:00 PST 2001

From: "Lourens Veen" <jsr at dds.nl>

> Well, have you ever tried saving a movie in MNG format? I doubt it'd
> compress very well compared to for example MPEG. I don't know the
> details of MNG, but if it's lossless like PNG then compression won't be
> good. And there's no need for it to be lossless since our brains only
> need a small amount of the information present in the stream. Thing is,
> if you store a bunch of images you're not exploiting inter-frame
> coherency, which is a real compression-killer.

Indeedy the point is that you can't use MNG, but if you use a method with I
frames (which in essence includes even a 2+1D transform) you need a texture
coder... and it doesnt take a big leap to reuse that for an image format too.


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