Also, the present invention reduces {HEAD ~ the conversion time} by structuring {TAIL ~ the bit streams} into a GOP 
by structuring
Also , the present invention reduces { HEAD ~ the conversion time } by structuring { TAIL ~ the bit streams } into a GOP
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH