[Mp4-tech] [Video] intraPrediction H.264

[Bule]

Hi 
i'm student of University of Padua and I'm writing a thesis on the H.264 standard with great interest on intraprediction process but there are some question I'm not able to answer..i hope you can help me.
1-if dcOnlyPrediction flag i set to 1 I think it's meaning that it is avaible only the DC prediction but in chapter 8.3.1.1 Derivation process for the Intra4x4PredMode i read that the value of this variable is set to one if one the two macroblocks A or B are not avaible but this is no clear. For istance if i can refer only to macroblock A ,the one on the left of the current MB ,i can use the 4x4Horizontal and 4x4Horizontal_Up prediction and not only the DC mode. Perhaps i have not understand the meaning of dcOnlyPrediction flag.
2-  In Chapter 8.3.2.4 specification of Intra16x16_Plane prediction mode I find the function which define the value of the prediction using H and V...why this two parameters ( H and V ) are so defined ? and it's possible to explain why the prediction function is so defined ? 
Thanks
Luca Bulegato
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