[MPlayer-users] PSNR Questions

Ian the.pond at dsl.pipex.com
Sat Feb 15 18:32:04 CET 2003

Hash: SHA1

D Richard Felker III wrote:

> Huh?? This is nonsense. You can't compare PSNR relative to two
> different reference 'signals'. When encoding, the source is considered
> the signal, and the difference between the encoded picture and the
> source is the noise, so the source has infinite PSNR automatically.

OK, this is the first time I've seen it stated, a formula would be nice 
too, but in any case see below . . .

> Yes, theoretically. Computational issues might make it come out
> different tho.

Regardless, since in my experience better quality material (ie. the 
originals!) has a lower PSNR than the copies, I can't take it seriously. 
  Obviously your experience is different.

> Huh?? Do you even know what PSNR means??

Can't find the reference (it seems to be unavailable ATM), but I thought 
it was peak signal to noise ratio.  I can't be that much of a dimwit if 
I'm using the encoder successfully, now can I? ;)

- -- 
- ------------------------------------------------------------------------
begin  GPG D694 FB76 12FC 94A7 4557  9951 8734 A4AC 7AA4 141E
Ian Smith
Worst . . . signature . . . ever !

Version: GnuPG v1.2.1 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org


More information about the MPlayer-users mailing list