The scientist who oversaw development of Tencent Holdings Ltd.’s flagship AI model has raised $50 million with a startup planning to release a rival to OpenAI’s Sora, the latest high-profile entry in one of the more profitable of artificial intelligence spheres.Liu Wei’s Video Rebirth completed a seed round of funding from investors including Qiming Venture Partners and South Korean game maker Actoz Soft Co., according to a company statement. Liu founded the Singapore-based outfit in October las...