Many of these databases specific to film can be used as indexes - that is, they may only provide article citations which you can then use in one of the general databases (listed below) to find in full-text.
Not all articles are online! The Latin American Library and Howard Tilton Library have physical copies of journals dedicated to the study of film and the film industry. To find these titles, go to the catalog and search by subject:
Motion pictures -- Latin America -- Periodicals
Motion pictures -- Argentina (or Mexico or Cuba) -- Periodicals