They are (ripped) footages from TV broacast of NHK (it's like BBC in UK, and PBS in the US).
NHK host a music festival week once a year, and it has been including a concert dedicated for video game music for a past few years. Here is the program of this year (Ocb 28, 2018, it is a free concert)
https://pid.nhk.or.jp/event/PPG03222...5110855886.pdf
Suites from Arc the Lad 2, Star Fox 64, Monster Hunter series, Shadow of the Colossus, UNDERTALE, Kirby Super Delux.