By request, here is LA 77 I downloaded from Bokkepoot off the hub. Normally I do not remember who I downloaded from, but everybody loves Bokkepoot and it took me about a week to find an open slot for him.
The quality is VG which to me is easily listenable but far from ideal.
From QueenConcerts.com:
22 minutes, silent footage. Tie Your Mother Down, Somebody To Love, The Prophet's Song, White Man, Bohemian Rhapsody, Now I'm Here, In The Lap Of The Gods... revisited).
The footage is only 12 minutes long. The last ten minutes are a repeat of what you've already seen, in worse quality. The video was filmed with a camera incapable of recording sound (as was usually the case in the 70s), and this was one of those bootlegs that had whatever other sound dubbed on top of it.