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“Portrait of an Album.” MGM/UA. $39.95. This 65-minute video chronicles the making of Frank Sinatra’s 1984 “L.A. Is My Lady” album, with the title tune downplayed (used only during the closing credits). Much time is taken up by voice-overs and interludes in which the Bergmans, Quincy Jones, Phil Ramone and others deliver how-great-thou-art homilies to the chairman. Star glitz is added by the presence of Michael Jackson. For the rest, it’s sub-vintage but often persuasive Sinatra, with fine Sam Nestico and Frank Foster arrangements.