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