macroblock is 16*16 area? Yes changing macrobloc quant in darker or "flatter" area won't reduce filesize?? Yes it will, as you produce more zero value coefficients, so the VLC does a better job = fewer bits. Jim _______________________________________________ XviD-devel mailing list XviD-devel@xvid.org http://list.xvid.org/mailman/listinfo/xvid-devel