[MPlayer-users] (no subject)

D Richard Felker III dalias at aerifal.cx
Tue Sep 7 09:17:47 CEST 2004

please start a new thread for a new topic, don't reply in an existing

On Tue, Sep 07, 2004 at 08:40:47AM +0200, Meino Christian Cramer wrote:
> Hi,
>  is the output of PSNR generally a good way to evaluate the quality of
>  an encoding ?

psnr is a good way to evaluate whether the compressed picture matches
the original picture you passed into the encoder well or not.

>  Or is it possible to encode to a really really bad result with a
>  really,really good PSNR value ?

yes, it's possible. for example if you deinterlace when you should use
inverse telecine, or if you break a/v sync, or if you encode with the
wrong output framerate and drop lots of frames, or ....

but assuming you've done all that right, good psnr and good quality
should roughly correspond. how good is needed, though? that's usually
a matter of what you're encoding, and what sort of display device
you'll be watching it on.


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