A friend has given me a DVD with a programme copied onto it by its maker. It plays fine on the TV, but won't play on my Mac. Or rather, the copy I've made, putting the VIDEO_TS and VIDEO–RM folders into a folder with the same name as the original DVD (SONY_RECORDER) won't play on my Mac. I had to copy it over from an ancient Mac to a newer Air using a flash drive because the Air doesn't have a DVD player.
Where am I going wrong?