[M4IF Technotes] Ac prediction

[Jani Huoponen]

Hi all,
There seems to be one vague point in the Visual standard regarding the AC
prediction, I would like to have your opinion on the interpretation of the
standard.
So the question is:
What values are supposed to use in ac prediction if type of the prediction
block (block 'A' or block 'C') is not intra? Standard does not seem to
impose any restrictions on usage of inter blocks as ac predictor blocks but
video verification model seems to specify that they should be handled the
same way as blocks outside the VOP or video packet (i.e. use zero values as
predictors instead of actual inter block ac coefficient values).
BR, Jani
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Jani Huoponen
Engineering Manager, System Design
Hantro Products Oy
Nahkatehtaankatu 2, 90100 Oulu, Finland
+358-40-5272676
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