Film La Merveilleuse vie de Jeanne d'Arc
http://www.imdb.com/title/tt0020165/
The trial scenes were filmed almost as starkly as the Dreyer film (which neither Genevois nor her director had yet seen) in the medieval Abbey of Mont St Michel. The execution, the only scene to be shot at the Joinville studio, was equally realistic - perhaps too much so.
"The moment the wood caught fire I yelled 'It burns!' Marco was so sure that I was afraid that he did nothing at all. All of a sudden the cameraman, Gaston Brun, shouted 'She's burning!' and everyone ran towards me, because I was tied up and couldn't budge. I was very frightened."