[theora-dev] too mach distortion on color gradient
bug-track at fisher-privat.net
Fri Oct 8 07:02:23 PDT 2010
Am Freitag, den 08.10.2010, 14:02 +0200 schrieb Alexey Fisher:
> Hallo Monty,
> Am Donnerstag, den 07.10.2010, 17:04 -0400 schrieb xiphmont at xiph.org:
> > First off, Ptalar does handle these cases better than Thusnelda did.
> > Second, the whole problem stems from the lowest AC coeffs not getting
> > enough bits, and I'd expect that to be a result of coarse quantizers.
> > What were the exact command lines used to encode? I'm only used to
> > seeing this effect in fairly low bitrate encodes.
> i'm not in sintel team, so i can't answer this question.
> I send an email Ton Roosendaal (ton blender.org), will see if we will
> get some response.
Here is response from Ton,
> Hi Alexey,
> We've posted the commandlines on our blog a couple of weeks ago:
> With all help and expertise offered it was the best we could do... a
> new quality ogv would be highly appreciated, that's why we uploaded
> the pngs to xiph. :)
> We also have dpx (16 bits color) files. But some have to be re-
> rendered still. Busy here still!
here is part of script was used:
mplayer mf://../input/png/*.png -mf w=2048:h=872:fps=24:type=png -sws 9
-vf expand=2048:1080,crop=1920:1080 -vo png:z=3
ffmpeg2theora --keyint 24 --framerate 24 -v 8 tmp/%08d.png --title
"$title" --artist "$author" --copyright "$copyright" --license
"$license" -o output/ogg/tmp-1080.ogv
oggz-merge output/ogg/tmp-1080.ogv output/ogg/tmp-audio-51.ogg
output/ogg/tmp-subs_nl.ogg output/ogg/tmp-subs_pl.ogg -o
echo "Ogg versions encoded"
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