[XviD-devel] Multithreaded encode

Marc FD xvid-devel@xvid.org
Thu, 5 Dec 2002 21:27:59 +0100


> > its already implemented in the xvid vfw gui.
> > this method of encoding is generally used to improve speed. it is
> > quicker to decode mpeg-4 than decode/resize/filter mpeg-2, but there is
> > some minor visual quality loss.
> 
> Quality loss compared to what? Or, with other words, is this a _visible_
> loss or just lower PSNR? 
> 
> Because most people would consider a perfect reproduction of the quant 2
> file just as good as a perfect reproduction of the original, even though
> PSNR would differ.

i think it depends of target quality.

i used a lot fast 2pass at low bitrates, and quality loss were unnoticable.
but if you recompress quant 2 to quant 2-3-4, i dunno how much you'll lose.