Re: Re: The big question : Codec recognition from

On Thursday 11 July 2002 22:45, Steve Lhomme wrote:
> Lasse Karkkainen wrote:
> >> Yep, I haven't thought of a nice way of handling this. It would
> >> probably not automatic, at least for conversion. I think the AVI to
> >> MCF conversion tool should know some of the codec it can handle (from
> >> the
> >
> > Btw, Transors could even transform the actual data. This would mean
> > converting between M$ MPEG-4 and ISO MPEG-4. XviD people say that there
> > is nothing to stop from doing that, but no-one cared to implement
> > general-purpose filter yet (ffdivx and DivX developers obviously cared
> > enough to implement their propietary filters).
>
> Could be possible... Because one of the basic feature of a Transor is
> transforming a coded data to another format (coded or not coded).
> So for each input format it support (M$ MPEG-4, ISO MPEG-4, XVID, Divx5,
> etc) there should be a list of supported output (RGB, YUV, ISO MPEG-4,
> etc). So transforming from one codec to the other is possible if a
> Transor supports this.
>
> So the automatic transformation could finally be possible, using the
> best "route" for each transor. That means we need not only priorities
> between transors, but also quality/speed values for each input<->output
> couple (to find the best one).
You miss a big point here, all those transformations need an extra layer (what 
you call transor)m which also means it needs an extra memcopy and memory 
bandwidth is a top speed factor on many systems, leaving this stuff in the 
player/codec allows much more effective handling.

-- 
Best Regards,
        Atmos
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