[Mp4-tech] [video]quantization

[Uch]

Hi, i\'m an italian student.
I\'m trying to implement the transform/scaling/quantization process with
matlab.
IAbout quantization parameter: i\'ve read lots of papers and the draft of
the standard but i\'ve not understood which is the criterion adopted to
choose the value of QPy or QSy between 0-51 (if i read right, only the
initial value of QP is chosen in the quantization process and then the same
initial value is used in the de-quantization process.
Also i would ank you the difference between QPy and QSy in the standard  and
what the parameters      pic_init_qp_minus26         and       
slice_qp_delta       are ??
regards
Uch  
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