Queen were among the first major rock bands to play behind the Iron Curtain (= in a communistic country). The tickets were sold out very quickly although they were available only in selected shops (and to selected people). Queen decided to film this special concert and borrowed ALL Hungarian film cameras. The result is pretty good, both picture and sound quality are excellent. Unfortunately, the video is (as usually) incomplete.
Note: a complete professional video recording exists on the bootleg market.