I have just extracted the DTS 5.1 audio of Hungarian Rhapsody, and split them into 6 sound channels, including the surround channel.
https://drive.google.com/file/d/10rEQRcYrbSA11Fo5b3cuXtX-nHP6ElsX/view
I just saw this video, we can see that we are the champions were filmed properly in the rare live release (It was placed after the part of Live in Frankfurt 1982). Brian May once said there were no footage since someone forgot to press "record" to the tape, maybe it were only some parts of the concert were not filmed properly, but not the others?
There is a better quality restored audience microphone founded, with no overdubs and loud guitar covering Freddie's vocal (Except some overdub vocals in sheer heart attack), the link is already uploaded: https://drive.google.com/file/d/1kgSVGfF6hEPJc1MRRk5Ps_cnH9nA8Cia/view?usp=sharing