Dear: MPEG-4 Experts Thanks to answer my previous question, Mr.Gautam. I can understand. I have one more question. If Intra MB which over Intra_dc_thr and block pattern_code == 0, in this case dc_coeff is also derived from Intra VLC ? If derive from Intra VLC, is always LAST and RUN 0 ? And do exist ESC ? bye Tetsuo Kosuge