In {TAIL ~ encoding mode}, VPU receives {HEAD ~ digitized video input} and compresses according to MPEG standard 
In { TAIL ~ encoding mode } , VPU receives { HEAD ~ digitized video input } and compresses according to MPEG standard
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH