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