wherein data of the first video, {HEAD ~ data} of the second video and the metadata have been recorded on {TAIL ~ a single non transitory recording medium} in advance 
recorded on
wherein data of the first video , { HEAD ~ data } of the second video and the metadata have been recorded on { TAIL ~ a single non transitory recording medium } in advance
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH