In 1974 Queen decide to film two of their concerts in the famous Rainbow Theatre in London (19th and 20th November). The film is then shown in British cinemas and in 1992 remastered and released on VHS in a box set called Box Of Tricks. It perfectly captures the atmosphere of the early Queen gigs - unfortunately, the recording is heavily edited. The video itself apparently comes from 20th November but it's possible some parts are from the previous night.
Note: full versions of Son And Daughter and Liar exist on several bootlegs, wrongly marked as "Adelaide 1974".