Perhaps the rare live footage is from 1989 and the dvd from 2005. During the late eightees en ninetees all the archives material from queen was dumped somewhere and not taking care of till our friend Greg Brooks came and archives the whole bunch of footage.
Don't Joke Queenman.
Maybe the guy who looks after Queen's archives used to work for the BBC and is the arse responsible for junking all those Dr Who episodes!!!