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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