[Ffmpeg-devel] DAR and SAR FFmpeg option confusion

[Roman Shaposhnik]

Hi

On Tue, 2007-03-13 at 09:27 +0000, M?ns Rullg?rd wrote:
> >
> >   I see your point now and it does make sense. That said, I guess
> > my biggest concern would be that starting to demand DAR being 15:11 
> > for 4:3 DV (or anything else for that matter) might be problematic from
> > a usability standpoint plus it might present a problem as far as
> > flagging 4:3 in various containers is concerned.
> >
> >   But I guess, if admitting DAR being 15:9 instead of 4:3 is our 
> > official "party line" I would protest too loudly ;-)  
> 
> The problem with DV appears to be that it is outright lying about the
> aspect ratios. 

  What is lying in your opinion ? The codec ? The SPEC ? The
information presented here ?
       http://www.mir.com/DMG/aspect.html
  Please be more specific.

  Also, you say that its just DV, not really -- SVCD for example
would also have the same problem.

>  Given two of DAR, SAR and size, the third can be
> easily calculated.  The numbers you gave are inconsistent.  We can't
> easily "fix" it as mathematics won't bend very easily.

   Which numbers and why do you think they are inconsistent ? Once
again, please go read: http://www.mir.com/DMG/aspect.html and if 
you find yourself in disagreement with what's written there then we
can talk about it meaningfully. The numbers Robert and I quoted are
very consistent with what's written as part of the resource mentioned
above.

Thanks,
Roman.