[XviD-devel] XviD-1.1-Beta 1 bugs summary

[Michael Militzer]

Hi,

ok, so let's update on this:

- the GMC bug has been fixed by SysKin.
- the cartoon mode issues seem fixed as well - at least I received positive
  feedback on doom9.
- interpolation cannot easily be used for chroma upsampling in our current
  colorspace conversion framework. The code relies on the fact that just a
  fixed (and even) number of vertical lines are processed/converted per
  iteration. This scheme wouldn't work anymore for interpolated chroma up-
  sampling. We could interpolate just every second line, then three out of
  four lines would be optimal - but I don't know if that really helps...

bye,
Michael 

Quoting Dirk Knop <dknop at stud.uni-goettingen.de>:

> Hi all,
> 
> for fixing some bugs and make the progress to 1.1-beta2 a little faster, 
> I'll sum up what I read as reports over at doom9's forum until now:
> 
> - GMC has a bug. With very much motion, some blocks get totally 
> displaced. The issue is the same no matter if decoded with libavcodec or 
> xvid.
> - Interlaced decoding got broken. Decoding interlaced streams encoded 
> with 1.1-beta1 with libavcodec(also with xvid-1.0.3) doesn't show this 
> problem, so it must be XviD's 1.1-beta1 decoder.
> - Some issue with cartoon mode and bvhq (well, cruncher may report it 
> better :) ): some white blocks sometimes floating around within high motion.
> - Vfw calculator: file sizes >2GB cause a variable overflow somewhere 
> resulting in wrong results.
> - Not a real bug: in colour space conversion we seem to use nearest 
> neighbour-upsampling when upsampling chroma. This should be, as xvid is 
> seen as high quality codec out there in the world, interpolated. Maybe 
> make it switchable for speed reasons. (The mmx code makes me dizzy %) )
> 
> I think those are the major problems with beta1 so far.
> 
> Maybe we should report into this "thread" if we make any progress, so 
> people can see that XviD is still alive and kickin'? :-)
> 
> Best regards
> Koepi
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