AI video generation from a text prompt. Returns an 8-second 720p clip with native audio. Use for short-form video, b-roll, product shots, music-video visuals, social clips, and ads. Include sound cues (instruments, voices, weather, movement) since audio is generated from the scene; a silent scene renders near-silent by design. Async by default: poll the returned pollUrl for videoUrl, or pass ?async=false to block.