These titles have "libretto" or "librettist" on their Cast/Crew page, but are not operas. Or they are exceptions on the filmog of an opera cast member. Or they are a concert version of an opera. Or I just couldn't say they _were_ opera.[wip]
"The Spanish words libretista (playwright, script writer or screenwriter) and libreto (script or screen play), which are used in the Hispanic TV and cinema industry, derived their meanings from the original operatic sense." The English spelling is used on IMDb crew credits.
Ballet also uses the term libretto for the written story of the work.