[theora-dev] too mach distortion on color gradient

xiphmont at xiph.org xiphmont at xiph.org
Thu Oct 7 14:04:40 PDT 2010


I've had a ook at these; the problem isn't banding actually, but
blocking (it looks like banding as the loop filter has smoothed the
boudaries).  Very similar to the effect in the 'sunflower' clip from
the demo updates.

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.


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