Size of macroblock in MPEG

Started by ambi...@yahoo.co.in March 15, 2010
Hi all,
I have a doubt regarding the size of macro block in compressed video namely MPEG-4. Will the size of macro block vary within the compressed domain.In a paper,I have read that if there is moving object,the size of macro block will increase.I am not getting how this is becoming true?.Can you provide explanation for this?.