Determine original language of the movie?
Sometimes I want to watch some movie in its original language i.e. without translation.For some movies, it's pretty easy. For example, - Antonioni's _[Blowup](https://en.wikipedia.org/wiki/Blowup)_ was originally filmed in English - His _[L'Avventura](https://en.wikipedia.org/wiki/L'Avventura)_ was originally filmed in ItalianBut for some movies it's not easy to determine the original language.Like, _[Spirits of the Dead](https://en.wikipedia.org/wiki/Spirits_of_the_Dead)_ by Roger Vadim, Louis Malle and Federico Fellini. How I can determine in what language it was filmed originally: Italian or French?Another example is _[Beyond the Clouds](https://en.wikipedia.org/wiki/Beyond_the_Clouds_(1995_film))_ by Michelangelo Antonioni and Wim Wenders. The question is the same: How I can determine in what language it was filmed originally?Well, currently I'm interested in these two movies, but my question is broader. Is there a way to determine the original language of _any_, i.e. _arbitrary_, movie?