Douro, Faina Fluvial was first shown at the International Congress of Film Critics in
Lisbon on 19 September 1931, where the majority of the
Portuguese audience booed. However, other foreign critics and artists who were in attendance praised the film, such as
Luigi Pirandello and
Émile Vuillermoz. Oliveira re-edited the film with a new
soundtrack and re-released it in 1934. Again in 1994, Oliveira modified the film by adding a new, more
avant-garde soundtrack by
Luís de Freitas Branco. Oliveira was influenced by German filmmaker
Walther Ruttmann's
documentary Berlin: Symphony of a City, and
Douro, Faina Fluvial was made in the same genre of
city symphony films. ==Legacy==