[MEncoder-users] Fwd: Questions on Mencoder performace

[Matthias Wieser]

Am Mittwoch, 7. Juni 2006 06:55 schrieb RC:
> On Tue, 6 Jun 2006 08:26:54 -0700
>
> Phil Ehrens <phil at slug.org> wrote:
> > I've done pretty extensive testing of nr, and 1000 has not been too
> > much on very clean dvd source, very noisy dvd source, or any dvd
> > source at all.
>
> I've done rather extensive testing myself.
>
> After about 600, video starts getting noticably blocky, particularly in
> dark scenes, clouds, etc.  And as you get to about 600, the PSNR
> stops increasing, and starts decreasing.

This should depend on the bitrate. If you use extremely low bitrate with a 
noisy input a large nv value will help. On the other hand, if you have 
extremely high bitrate, even a small nr value will decrease psnr (compared 
to the original video).