[Mp4-tech] Doubt regarding MPM

[Sankalpa Devanallikar]

Hi All,
 Iam working on intra4x4 block in which the most probable mode is to be
computed.
  Most probable mode is  the minimum of the mode of the left predicted block
and the mode of top _predicted block.
    If ,the currect block happens to be the second block in the frist row of
the frame ,then the left block is valid but we donot have any top block mode
 .So ,what will be the MPM?????
  Similarly ,if the block happens to be the left blocks of the frame,then
the top mode is valid while the left is not  avaliable .So what will be the
MPM???
  Can any please help  me .
Warm Regards,
Sankalp
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