[Mp4-tech] [H.264] Calculation of Ref Frame values from Mvds

[Arun Pradeep]

In P Slice,
Suppose after getting the Motion Vectors for my current Block as 2 and 4,
How will I locate or calculate the corresponding Block pixel values 
in the Ref Frame ?
Can anybody answer to this ?.
Suppose if the current block is an Inter Block in a P Slice and if the
Left MB is an Intra Block
What should be the Mvd and RefIdx values of the Intra Block ?