{"servers":[{"url":"https://api.modellix.ai/api/v1/alibaba/happyhorse-1.1-i2v"}],"post":{"description":"[Core Function] HappyHorse 1.1 I2V is Alibaba's latest streamlined first-frame image-to-video model. [Strengths] It turns a single image into high-quality 720P/1080P video with native audio support and 3-15 second duration; output aspect ratio follows the first frame image. [Best For] Highly recommended for: rapid image animation, product motion previews, and simple character or scene animation. [Limitations] It does not accept an explicit ratio parameter; use T2V or R2V when you need a fixed generated aspect ratio. [Routing] Prefer this model when the user provides one image and requests HappyHorse image animation.","operationId":"happyhorse11I2vAsync","requestBody":{"content":{"application/json":{"examples":{"advanced":{"summary":"Advanced with all parameters","value":{"duration":5,"first_frame_image":"https://example.com/first.jpg","prompt":"Smooth camera movement showing the scene from different angles","resolution":"1080P","seed":12345}},"basic":{"summary":"Basic video generation from image","value":{"first_frame_image":"https://example.com/first.jpg"}},"high_quality":{"summary":"High quality 1080P with longer duration","value":{"duration":10,"first_frame_image":"https://example.com/landscape.jpg","prompt":"Slow pan across the beautiful landscape","resolution":"1080P"}},"with_prompt":{"summary":"With text prompt guidance","value":{"first_frame_image":"https://example.com/cat.jpg","prompt":"A cat running happily on a sunny meadow"}}},"schema":{"properties":{"duration":{"default":5,"description":"Video duration in seconds. Must be an integer between 3 and 15","enum":[3,4,5,6,7,8,9,10,11,12,13,14,15],"maximum":15,"minimum":3,"type":"integer"},"first_frame_image":{"description":"First frame image URL. Supports HTTP/HTTPS URLs. Image requirements: Format: JPEG, JPG, PNG, WEBP; Resolution: Width and height >= 300 pixels; Aspect ratio: 1:2.5 ~ 2.5:1; File size: <= 10MB","examples":["https://example.com/first.jpg"],"pattern":"^https?://","type":"string"},"prompt":{"description":"Optional text prompt to guide video generation. Supports any language input. Maximum length: 5000 non-Chinese characters or 2500 Chinese characters (automatically truncated if exceeded)","maxLength":5000,"type":"string"},"resolution":{"default":"1080P","description":"Video resolution level. The model automatically scales to the nearest total pixels based on the selected resolution. The output video aspect ratio approximately matches the input first frame","enum":["720P","1080P"],"type":"string"},"seed":{"description":"Random seed for reproducibility. If not specified, the system generates a random seed. Note: Due to the probabilistic nature of model generation, even with the same seed, results may not be completely identical","maximum":2147483647,"minimum":0,"type":"integer"}},"required":["first_frame_image"],"type":"object"}}},"required":true},"responses":{"200":{"content":{"application/json":{"schema":{"properties":{"code":{"description":"Response code, 0 indicates success","example":0,"type":"integer"},"data":{"description":"Detailed data about the submitted asynchronous task.","properties":{"get_result":{"description":"API information to query the task result","properties":{"method":{"description":"HTTP method","example":"GET","type":"string"},"url":{"description":"Full URL to query the task result","example":"https://api.modellix.ai/api/v1/tasks/task-abc123","type":"string"}},"type":"object"},"model_id":{"description":"Model ID","example":"model-123","type":"string"},"status":{"description":"Task status","enum":["pending","processing"],"example":"pending","type":"string"},"task_id":{"description":"Unique task identifier","example":"task-abc123","type":"string"}},"required":["status","task_id","model_id"],"type":"object"},"message":{"description":"Response message","example":"success","type":"string"}},"required":["code","message","data"],"type":"object"}}},"description":"Task submitted successfully"}},"summary":"HappyHorse 1.1 I2V","x-mint":{"href":"alibaba/happyhorse-1-1-i2v"}}}