[vorbis-dev] ogg pic format (again).. here's why
xiphmont at xiph.org
Fri Jan 26 17:38:54 PST 2001
> I sent a little mail some time ago asking if there was going to be an ogg
> pic-format, and you replied that PNG, MNG and JNG is good enough (sorry for
> this late answer btw).. But, consider this: The ogg video-format (tarkin ?
> where do you get these names from anyway ? :) ) needs a way to compress its
> frames. Are you going to use MNG for that ? :) ..
We need a lossless and a lossy compression format. One format
generally doesn't do both well (Tarkin, for example, currently assumed
a time dimesion in order to work properly).
> If you had an ogg pic format, that format could not only be used for normal
> pictures, but also for animations and movies! Both pictures, animations and
> "real" movies (should) have this in common: compress it to as good quality
> and small size as possible. Why not make all in one ? This format could also
> support some cool stuff that PNG doesn't, like layers. Actually, layers
> could simply be a special kind of animation, where all the frames are put on
> top of each other at once. Layered animations would then be animated
> animations :) . In animations, layers could even be shared for different
> frames! For movies this layer function could be used for fx. translation of
> text in the picture (normal subtitling should of course be text with
This will be possible at very least at the Ogg level (specifying
multiple video layers with alpha channel for overlay).
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