[MEncoder-users] Call for video encoding settings

[Guillaume POIRIER]

Hi,

On 8/19/05, Michael Niedermayer <michaelni at gmx.at> wrote:
> Hi
> 
> On Mon, Aug 15, 2005 at 10:11:21PM +0200, Guillaume POIRIER wrote:
> [...]
> > Snow, constant quality:
> > vqscale=2:vcodec=snow:cmp=1:subcmp=1:vqcomp=0.6:pred=1:psnr:vstrict=-2
> > 8fps  941.722  kbit/s, PSNR: Y:45.70, Cb:47.96, Cr:48.61, All:46.40
> > vqscale=2:vcodec=snow:cmp=1:subcmp=1:vqcomp=0.6:pred=1:psnr:vstrict=-2:qpel
> > 8fps  931.956  kbit/s, PSNR: Y:45.77, Cb:47.91, Cr:48.55, All:46.45
> [...]
> > Two pass:
> > vqscale=2:vcodec=snow:cmp=1:subcmp=1:vqcomp=0.6:pred=1:psnr:vstrict=-2
> > 9fps  898.809 kbit/s, PSNR: Y:45.48, Cb:47.79, Cr:48.45, All:46.19
> >
> > vqscale=2:vcodec=snow:cmp=1:subcmp=1:vqcomp=0.6:pred=1:psnr:vstrict=-2:qpel
> > 9fps  898.991 kbit/s, PSNR: Y:45.41, Cb:47.72, Cr:48.36, All:46.12
> 
> hmmm vqscale=2 on 2 pass and vqcomp together with vqscale?

I used on vqscale=2 on pass 1, and vbitrate=900 on pass 2 I should
have mentioned it indeed.

> why pred=1 ?

Right, this is a bad idea: according to DOCS/tech/snow.txt :

  * pred=<0-2>
   Wavelet type. 0 (9/7 wavelet), 1 (5/3 wavelet), 2 (13/7 wavelet).
   9/7 is probably better for for lossy coding, and 5/3 for lossless.
   NOTE: 9/7 wavelet doesn't work with lossless mode.

so it should be pred=0 here

> why no mbcmp=1 ?

No reason at all.

Thanks a lot Michael for having a look at my tests, I'll redo them
when I have more time.

Guillaume
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