The romance “(500) Days of Summer” ($29.98 DVD, $39.99 Blu-ray; Fox, available now), starring Joseph Gordon-Levitt and Zooey Deschanel, understands that we mark our lives by our scrapes and defeats with love rather than by the white-wedding-cake successes.

It’s a drama that, at first blush, would seem excruciatingly ordinary: the 500-day affair between Tom (Gordon-Levitt), who believes wholeheartedly in love, and Summer (Deschanel), the object of his affection, who isn’t sure about love at all. Does Tom convince Summer that love can be real, that it can work? That’s the narrative suspense here.

But the real story is about those personal Waterloos, the battles that take everything to fight and whose victorious outcomes are far from assured. What makes us connect is Tom’s funny, morose and ironic commentary as he does his darndest to reach the heart of a woman whose idea of lover and friend is confusing.

The DVD has a commentary with Gordon-Levitt, director Marc Webb and others, plus deleted and extended scenes with optional commentary. The two-disc Blu-ray also has a making-of feature; audition tapes; storyboards; conversations with the stars; and a digital copy.

“All About Steve” ($29.98 DVD, $39.99 Blu-ray; Twentieth Century Fox, available now) is a gruesome, almost perversely un-funny movie about a crossword puzzle constructor who obsessively follows a man across the country. It may get an asterisk on Sandra Bullock’s resume as the most misguided move of her career.

Bullock’s Mary Magdalene Horowitz chases a news cameraman named Steve (Bradley Cooper), whom she nearly mauls on a blind date before they even pull away from the curb. The movie is by turns cruel and unusual, culminating in a tortured critique of contemporary media and conformism. Thomas Haden Church provides a few laughs as a vain newscaster, but buying Bullock as a hapless nerd is simply asking too much.

Extras include a commentary; a making-of feature; deleted scenes and gag reel. The Blu-ray also has a digital copy.

“Jennifer’s Body” ($29.99 DVD, $39.99 Blu-ray; Twentieth Century Fox; available Tuesday). Megan Fox makes a subversive plaything of her smokin’ hottie persona as Jennifer Check, a high school Queen Bee who, after an ugly encounter with a van full of rock musicians, becomes a raging succubus with a taste for Type B (“Boy”) blood. Amanda Seyfried plays Jennifer’s bookish pal, who twigs to her BFF’s psycho-weirdness and could very well pay for that insight with her life.

The movie, written by Diablo Cody (“Juno”), introduces a little rrriot grrrl-y feminism to a genre that for too long has been predicated on female victimization. And director Karyn Kusama (“Girlfight”) handles the structural imperatives with solid timing and occasional panache.

Includes the theatrical and an unrated version of the film, plus commentaries. The Blu-ray has a digital copy.

“It Might Get Loud” ($27.96 DVD, $37.95 Blu-ray; Sony, available now). Jimmy Page, the Edge and Jack White, three of the more influential guitarists of several generations, start a little fire-by-fret during director Davis Guggenheim’s film, which depicts wood, lacquer and hardware the way Hugh Hefner depicts Miss September.

The documentary was conceived as a tribute to the electric guitar, easily the most important musical development of the rock era, maybe even the 20th century.

Guggenheim, who won an Oscar for “An Inconvenient Truth,” makes all this guitar/ guitarist worship both cinematic and delicious. This film is full of personality and charm and has a charisma level that’s set at around 11.

A commentary with Guggenheim; news conference from the Toronto Film Festival; deleted scenes and a “Loud” playlist are included.

Coming Tuesday

“9” (Universal), “Carriers” (Paramount), “Jennifer’s Body” (Fox), “The Marine 2” (Twentieth Century Fox), “Paranormal Activity” (Paramount), “A Perfect Getaway” (Universal), “Spaceballs: The Totally Warped Adventures” (animated, MGM).