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