Oct. 4 (Bloomberg) -- Meta today announced Movie Gen, a new AI video generator that produces high-definition videos with sound. A few months ago, its competitor OpenAI also launched its text-to-video model, Sora. Inputting text into Movie Gen automatically generates video, and it can also edit existing video or still images. According to the New York Times, the audio added to the video is also AI-generated, matching the video with ambient noise, sound effects and background music, and the video supports different aspect ratios...