Alice Guy tourne une phonoscène sur la théâtre de pose des Buttes-Chaumont

In this unique documentary, we can see the director, the actors' preparations, the photographers at work, and the complicated lighting system, including the camera. We don't know how many such sound films were made, but Gaumont has more than a thousand in her catalogue – another proof that film was never silent.
The film has been identified as an advertisement for the Gaumont company's Phonoscènes. IT shows the filming of one such sound film at the famous Buttes-Chaumont studios. (Ji.hlava International Documentary Film Festival)