[M4IF Technotes] (video_object_layer_width / height) not a mu
ltiple of 16
Robert Beattie
r.beattie indigovision.com
Tue May 21 12:22:55 EDT 2002
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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