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