[MPlayer-users] Re: encoding quality - bpp, resolution, quantsand quality

[Michael Niedermayer]

Hi

On Friday 12 September 2003 04:53, D Richard Felker III wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
>
> On Thu, Sep 11, 2003 at 06:05:05PM -0700, Corey Hickey wrote:
> > [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> >
> > HR wrote:
> > >How useful is trell for DVD encodings? Should be less noise there than
> > >from a TV/VCR source? How does digital TV broadcasting fit in here?
> >
> > In my experience it increases PSNR somewhat. Of course, PSNR isn't
> > everything, but with such small differences it's nice to have a
> > quantifiable comparison.
> >
> > >I also considered using mbd=1, or is that the default when using vhq? I
> > >mean if there's a difference between the "vhq" turned on by mbd=1 and
> > >the vhq parameter, what is it? And if not, do they work well together?
> > >
> > >HR
> >
> > As far as I know, vhq is just an alias for mbd=1. You might as well
> > try mbd=2, though. My tests have shown it to increase psnr somewhat,
> > again.
>
> I don't really understand mbd=2, but I'd recommend doing some testing.
it chooses the encoding which minimizes sum_of_squared_errors + 
number_of_bits*lambda

> It might only improve psnr with 2pass encoding.
no, its always better

[...]
-- 
Michael
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