[MEncoder-users] Custom quantizer matrix

[Francois Visagie]

> From: mencoder-users-bounces at mplayerhq.hu 
> [mailto:mencoder-users-bounces at mplayerhq.hu] On Behalf Of 
> Giacomo Comes
> Sent: 09 October 2007 17:08
> To: MEncoder usage discussions
> Subject: Re: [MEncoder-users] Custom quantizer matrix
> 
> On Tue, Oct 09, 2007 at 03:33:13PM +0200, Tobias Brockamp wrote:
> > Doesn't anybody have such custom matrix in use? I only need one for 
> > editing, because i haven't found any documentation how such 
> a matrix 
> > look like so mencoder can use it.
> > 
> > In the mencoder man-page it says that xvid4conf does produce the 
> > matrix but i can't find a windows binary.
> > 
> > please, i strongly need this feature.
> 
> Are you asking about how to use custom quantization matrix 
> with mencoder?
> With libavcodec it is really easy:
> -lavcopts inter_matrix=a,b,c....:intra_matrix=d,e,f.....
> with xvid:
> -xvidencopts 
> quant_type=mpeg:quant_inter_matrix=file1:quant_intra_matrix=file2
> the content of file1/2 looks like (8x8 coefficents):
>  16 18 20 22 24 26 28 30
>  18 20 22 24 26 28 30 32
>  20 22 24 26 28 30 32 34
>  22 24 26 30 32 32 34 36
>  24 26 28 32 34 34 36 38
>  26 28 30 32 34 36 38 40
>  28 30 32 34 36 38 42 42
>  30 32 34 36 38 40 42 44
> The values of the coefficent for various metrixes can be 
> easily found with google.

At the risk of breaking the thread with my mail program by responding
(although it looks like the new spam filter at least doesn't mess with the
subject line), the Windows program HCenc_xyz.exe comes with a host of
preconfigured matrices.

Kind regards,
Francois





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