How do AI models generate videos?

How do AI models generate videos? With powerful video generation tools now in the hands of more people than ever, let's take a look at how they work. It's been a big year for video generation. In the last nine months OpenAI made Sora public, Google DeepMind launched Veo 3, the video startup Runway launched Gen-4. All can produce video clips that are (almost) impossible to distinguish from actual filmed footage or CGI animation. This year also saw Netflix debut an AI visual effect in its show, the first time video generation has been used to make mass-market TV.