[Mp4-tech] B picture with all Intra MB's ?

[hungary]

Dear experts,
Is it permitted to code all MBs as intra and still have the picture type
as for B picture ?
Though the picture type is B but still as per i see the standard doesnot
tell anything regarding this.
According to the standard it should decode.
Plz clarify if i am wrong !
Regards
Hungary
-- 
  hungary
  mykerekes eml.cc
-- 
http://www.fastmail.fm - Same, same, but different