[Mp4-tech] tm5 rate controller

[rian c cullinan]

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Hi all 
In the TM5 rate controller document says
"compute a spatial activity measure for the macroblock j from the four luminance frame organised subblocks 1 to 4 and the four field organised sub block 5 to 8"
here what is the difference between field organised and frame organised subblocks
thanks in advance