[XviD-devel] pre-processing

[Christoph Lampert]

On Sat, 14 Sep 2002, Marc FD wrote:

> Hi all ;)
> 
> I'm making my first steps trying to improve XviD with "pre-processing"
> I just wanted to know, can i say that -0.2 Db in PSNR and -12% in size (@ quant 2) is an improvement ??
> (for my eyes, it's perfect, but if you can see a 0.2 PSNR change, you've damn good eyes !)

You can't say it like that. To decide if size difference is better than 
PSNR drop, you should test at constant bitrate mode for that.

But for preprocessing this is not really good, either. So maybe 12% size
difference is very good, if the visual quality doesn't get worse.

gruel