The video I’ve seen is exceptional quality. It’s as if it was filmed yesterday.
It’s probably film, then. I’ve noticed the Brits and BBC used higher quality stuff than the yanks for their musical productions. Neil Young at his plaid shirt peak days, overseas about 1970 or so. Amazing.
They filmed the making of the last album in the documentary movie, “Let it Be”. This was part of it. My brother bought it on Laser Disc back in the day.