[WM]: Parameters in MPEG-2 compression

[Anindya Sarkar <ani_great@yahoo.com>]

Hi
 I have a query about MPEG 2 encoder..When you run a MPEG encoder program, you have to specify a .par file.
In the par file (parameter file), what are the parameters that you can play around with? (e.g. you can specify your own GOP size
(6/8/12), the distance between I-P frames (2/3)).. can we also specify the intra-quantization matrix..
E.g. in the standard MPEG-2 code, we have:
EXTERN unsigned char
default_intra_quantizer_matrix[64]
#ifdef GLOBAL
=
{
   8, 16, 19, 22, 26, 27, 29, 34,
  16, 16, 22, 24, 27, 29, 34, 37,
  19, 22, 26, 27, 29, 34, 34, 38,
  22, 22, 26, 27, 29, 34, 37, 40,
  22, 26, 27, 29, 32, 35, 40, 48,
  26, 27, 29, 32, 35, 40, 48, 58,
  26, 27, 29, 34, 38, 46, 56, 69,
  27, 29, 35, 38, 46, 56, 69, 83
}
#endif
;

Now, we all know that in JPEG, depending on the quality factor at which we want to compress, we can specify a different quality
factor matrix. What will be the corresponding case for MPEG-2 compression?
Depending on our requirements, hou will the choice of intra-quantizer matrix vary?

Thanks in advance
Anindya 


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