{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"prompt":{"description":"Text prompt describing the video to generate","type":"string","maxLength":2048},"negative_prompt":{"description":"Negative text prompt","type":"string","maxLength":2048},"image_input":{"description":"Base64-encoded reference image for image-to-video generation (data:image/...;base64,...). The image will be uploaded to Pixverse automatically.","type":"string"},"duration":{"description":"Video duration in seconds","default":5,"anyOf":[{"type":"number","const":5},{"type":"number","const":8},{"type":"number","const":10}]},"aspect_ratio":{"description":"Video aspect ratio","default":"16:9","type":"string","enum":["16:9","4:3","1:1","3:4","9:16","2:3","3:2","21:9"]},"quality":{"description":"Video quality","default":"720p","type":"string","enum":["360p","540p","720p","1080p"]},"seed":{"description":"Random seed for reproducibility","type":"integer","minimum":0,"maximum":2147483647},"motion_mode":{"description":"Motion mode (fast only available when duration=5; 1080p does not support fast)","type":"string","enum":["normal","fast"]},"generate_audio":{"description":"Whether to generate audio with the video","default":true,"type":"boolean"}},"required":["prompt","duration","aspect_ratio","quality","generate_audio"],"additionalProperties":false}