RE: [OpenDivX] dct

[prakash <prakash@cs.tut.fi>]

Hello All,
They should of the same macro block. The co-efficients are from the first
block of a macro block in the first Y frame.


with regards
Prakash













On Tue, 22 May 2001, c0redumb wrote:

> Thanks. It sounds strange, since the DCT is thoroughtly tested, and cross
> tested with standard MPEG-4 bitstreams. I will double check later. Are you
> sure that those are the coefficients for the same Macroblock?
>
> c0redumb
>
> > -----Original Message-----
> > From: opendivx-admin@lists.projectmayo.com
> > [mailto:opendivx-admin@lists.projectmayo.com]On Behalf Of prakash
> > Sent: Monday, May 21, 2001 6:43 PM
> > To: opendivx@lists.projectmayo.com
> > Subject: [OpenDivX] dct
> >
> >
> > Hello all,
> > I have tried to compare the fdct values which come  out of the dct routine
> > under linux for mpeg2(TM-5) encoder and the ones from encore. The
> > difference between the DC values is large for the same YUV file used.
> >
> > Eg:
> > 	 200  -40  -23  -13  -16  0 (are the first few values obtained
> > 					from TM-5 after dct)
> > 	1227  -60    0    1    0  0 (are the values from encore)
> >
> > Since both the fdct implementation are the same, I am bit lost at this
> > huge variation in the dc values?
> > The the YUV files were generated from flower garden video sequence.
> >
> > with regards
> > Prakash
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
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