Here, {HEAD ~ the predetermined time} represents {TAIL ~ the time} required for a picture to be decoded and displayed, without any breakage 
Here , { HEAD ~ the predetermined time } represents { TAIL ~ the time } required for a picture to be decoded and displayed , without any breakage
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH