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

Monty 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
> timecodes).

This will be possible at very least at the Ogg level (specifying
multiple video layers with alpha channel for overlay).


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