[MEncoder-users] Codec-independant objective quality measurement

[Matthias Wieser]

Am Donnerstag, 3. August 2006 12:28 schrieb Nicolas George:
> Le quintidi 15 thermidor, an CCXIV, Matthias Wieser a écrit :
> > First: I don't know any good non-psnr tool for linux.
>
> That is too bad :(
>
> > You could use mplayer/TOOLS/psnr-video.sh for this purpose.
>
> Thanks, I did not see this script until now.
>
> As fas as I understand how it works, what it does is:
>
> - call mplayer twice to convert the videos into simple bitmap files in
>   temporary directories;
>
> - call pnmpsnr to make the actual evaluation on each pair of images;
>
> - do some postprocessing on the results to combine it in a simple, usable
>   result.
>
> Am I right?

Exactly.


> I started doing roughly the same thing a few days ago. I use yuv4mpeg and
> pipes instead of pnm and temp files, which is a little bit more efficient
> (especially because it does not require 60 megaoctets of temporary
> storage space for each second of DVD-quality evaluated material :-), but
> the principle is exactly the same. I intend to publish the result when it
> will be a little bit more polished.

I'm interested in your script. I thought about pipes but could not find an 
easy solution, hence the temp files. But hdd space is cheap :-)

Regards,
  Matthias