[M4IF Technotes] (video_object_layer_width / height) not a mu ltiple of 16

[Biju Ravindran]

Hi,
   If we do motion estimation on outside the boundry
after extending the edge pels, it can give a match
which will result in reduced bit rate. So there is no
need of restricting the motion vector if the edge pels
are copied outside the effective area.
-biju
--- Robert Beattie <r.beattie   indigovision.com> wrote:
> Could it possibly be due to unrestricted motion
> vectors. That is predicted
> data from lines > 241 should be copied from line 241
> rather than just using
> the previously decoded (junk) data ?
> 
> Cheer's
> 
> Dr Rob Beattie
> Indigo 
> 
> > I am trying to decode a MPEG4 simple profile
> bitstream
> > with dimensions 352 x 242. My understanding of the
> > standard is that for all decoding operations
> (Motion
> > compensation etc.) the video_object_layer_height /
> > width should be rounded off to the next multiple
> of 16
> > ; in this case 352 x 256. Whereas for display
> purposes
> > the dimesions as sent in the bitstream (i.e 352 x
> > 242)should be used. 
> > Using the above strategy results in some artifacts
> in
> > the decoded output. Could anybody let me know
> where I
> > could be going wrong. 
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=====
ciao,
..ju
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