Hi Steven,
> I see that mpeg2enc has the option "--intra_dc_prec [9-10]" - does
> that affect the calculations or does it simply set the value in the
> MPEG headers? What effect, if any, does a higher dc precision have
> on the picture quality?
It does affect the calculations. The quantisation of intra block's DC
coefficients is changed. Setting 10 means a 10-bit precise DC coefficient is
used, 9 9-bits and so on. I've never noticed any visible change in picture
quality - Intra coded blocks are pretty rare anyway (and large). I
strongly suspect it is just another of the many more-or-less pointless
options buried in MPEG-2 that make it so unnecessarily complex.
cheers,
Andrerw
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