[M4IF Technotes] h.263 motion vector predictor

[Herbert Thoma]

Ariel David schrieb:
> 
> Hi,
> 
> I am trying to decode mpeg-4 video files with short header (h.263 format).
> I've looked though the mpeg-4 standard and found not mention of a different method for motion vector predictor.
> The mpeg-4 method is the median of the 3 adjacent macroblocks.
> This does not seem to work in h.263 (mpeg-4 with short headers).

Why not? It's exactly the same in H.263.
 Herbert.
> I assume it's more like mpeg-2, either left or top macroblock, but I can't find any mention in the standard.
> 
> Can someone help me out?
> 
> Thanks,
> 
> Ariel
> 
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Herbert Thoma
FhG-IIS A, Studio Department
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