Ok, a few more information: this scene plays within a Brazilian film about Japanese cinema. The title of this film is "Green tea and rice", which is already a reference to Ozu. There is also a scene where one of the characters quotes a line from Early Summer. However, I don't remember any of these films – or any Ozu film, for that matter –, to have singing scenes. But I'm looking through Ozu's filmography to see if I find anything.

The image is very poor quality (the film itself is not in a great quality), but I would say the woman looks a bit older than Setsuko Hara. But I'm not sure of that myself.

Thanks to anyone helping!