[MPlayer-dev-eng] Re: [MP] [PATCH] "turbo" mode

[D Richard Felker III]

On Wed, Sep 15, 2004 at 10:01:14PM +0200, Guillaume POIRIER wrote:
> I did another test without "qns", and had an interesting surprise. 
> without turbo, 1&2nd pass: 17fps :
> PSNR: Y:42,17, Cb:43,16, Cr:43,05, All:42,46
> with turbo, 1st pass @ 57fps, 2nd pass @ 16fps:
> PSNR: Y:42,17, Cb:43,15, Cr:43,04, All:42,46
> 
> (turbo has been disturbed a bit by some other CPU & disk activity)
> So here we still have pretty much same PSNR. Looks like qns was
> degrading PSNR.... 

of course qns degrades psnr, that's the whole point of noise shaping.
:) it's a perceptual quality optimization, not a psnr optimization, so
it's difficult to compare like this.

rich