[x264-devel] qp value

[Erich Marth]

Hi Gabriel thanks for your reply. The thing that really puuzels me is  
that I don't understand who the MF values are computed inside x264. In  
the standard there is a simple
Equation which is used to compute MF(a,b,c,qp):

MF/2^(qbits) = {a^2,...}/qstep

but as a result the MF values will repeat every six values. .


Destination

On 02.12.2009, at 08:45, Gabriel Bouvigne <bouvigne at mp3-tech.org> wrote:

> Erich Marth a écrit :
>> That really won't help me. I was asking because I wanted to  
>> outsource  the quantization on other Devices. Therefor I was trying  
>> to understand  the qp Situation in x264 but I don't Know why those  
>> values differ  entirely from the Standard values (MF, qp)
>
> You might be puzzled by the fact that x264 uses qscale values in  
> several places instead of qp. Qscale is supposed to be a linear  
> representation of the qp range, hence easier to use in usual  
> computations.
> There are qscale2qp and qp2qscale functions used to go from one kind  
> of unit to the other one.
>
>
> -- 
> Gabriel Bouvigne
> www.mp3-tech.org
> personal page: http://gabriel.mp3-tech.org
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