[MEncoder-users] MPEG-2: vrc_minrate and vqmin / lmin

Nicolas Hesler nicolas.hesler at sheridanc.on.ca
Mon May 12 19:06:16 CEST 2008


> See above. Low lmin values only mean higher probability of low 
> quantizers. While lmin=0.01 won't produce quantizers lower than 1 
> (Because vqmin forbids it. And they'd be useless anyway - dividing by a 
> value less than 1 means you make up bigger coefficients than are 
> actually there. That'd be plain stupid.), it also modifies probabilities 
> for quantizers bigger than 1.
>
>   
>
lmin set to 0.01 improved the banding immensely.    Adding dc=10 reduced 
pulsating (at the keyframe intervals) in some of the blocks in the 
banded areas.

I suppose that banding is just part of the game with MPEG-2 encoding?

Thanks for your help!!!!






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