Explainer Video
Explainer Video uses knowledge_video and creates continuous animated scenes with narration.
{ "type": "knowledge_video", "prompt": "Explain MCP with continuous animated scenes", "language": "en", "aspect_ratio": "16:9", "duration_seconds": 30}
duration_seconds belongs only to Explainer Video and must follow the current catalog limits. After generation, use update_scene_narration or regenerate_scene for a selected scene.
