[MPlayer-dev-eng] comprehensive lavcopts test - in progress.

[Roman Gaufman]

Sorry, only joined the mailing list recently, can you point me to such 2 
options that alone have a PSNR drop and filesize gain, but together have PSNR 
gain and filesize drop?

while looking at some of the results posted, I cannot see such 2 options..

On Tuesday 15 June 2004 03:40, D Richard Felker III wrote:
> On Mon, Jun 14, 2004 at 11:44:09PM +0000, Roman Gaufman wrote:
> > Sorry, I dont have the original message, only joined the mailing list
> > recently.
> >
> > Also, you havent answered my question, but I may have phrased it badly.
> >
> > The question is:
> >
> > For that long list of opts, if you remove everything, and just run
> > mencoder -lavcopts $general:dia=-2:predia-2
> > mencoder -lavcopts $general:dia=2:predia2
> > ($general being psnr:vpass=1, etc, none of the extra opts), do you get
> > the same psnr value for the 2 encodings?
> >
> > -- if you do, that proves my point of being able to test args with
> > different values separately, then combining the ones that give best
> > results with other args.
> >
> > Couple of points:
> > 1) PSNR ratio to filesize is also very important, not just PSNR value,
> > you should provide a difference in filesize as well (if any)
> > 2) You get best PSNR values when combining many opts together, yes, but
> > each opt can, and should be tested separately to find out what to
> > combine.
>
> This was done. Read the thread!!!
>
> > There is no point combing options that show a degradation in quality and
> > a gain in filesize. No matter how you group them, they wont help much. So
> > this
>
> False. Two options that are bad alone can be good when combined. B
> frames could easily be involved in such a pairing.
>
> Rich
>
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