/aliyun-happyhorse-i2v

name: aliyun-happyhorse-i2v
description: Use when generating videos from a single first-frame image with DashScope HappyHorse 1.0 image-to-video model (happyhorse-1.0-i2v). Use when implementing first-frame video generation with optional text guidance via the video-synthesis async API on Alibaba Cloud Model Studio.

HappyHorse 1.0 Image-to-Video (First Frame)

Validation

mkdir -p output/aliyun-happyhorse-i2v
python -m py_compile skills/ai/video/aliyun-happyhorse-i2v/scripts/i2v_happyhorse.py && echo "py_compile_ok" > output/aliyun-happyhorse-i2v/validate.txt

Pass criteria: command exits 0 and `output/aliyun-happyhorse-i2v/validate.txt` is generated.

Output And Evidence

• Save task IDs, polling responses, and final video URLs to `output/aliyun-happyhorse-i2v/`.
• Keep at least one end-to-end run log for troubleshooting.

Prerequisites

• Install dependencies (recommended in a venv):

python3 -m venv .venv
. .venv/bin/activate
python -m pip install requests

• Set `DASHSCOPE_API_KEY` in your environment, or add `dashscope_api_key` to `~/.alibabacloud/credentials`.

Critical model names

• `happyhorse-1.0-i2v` — first-frame image-to-video; output aspect ratio follows the input image automatically

Capabilities

| Capability | Description | Required media | |---|---|---| | First-frame video | Generate a video from one first-frame image, optionally guided by a text prompt | `first_frame` (exactly 1) |

API endpoint (async only)

POST https://dashscope.aliyuncs.com/api/v1/services/aigc/video-generation/video-synthesis

Required headers:

• `Authorization: Bearer $DASHSCOPE_API_KEY`
• `Content-Type: application/json`
• `X-DashScope-Async: enable`

Singapore endpoint: replace `dashscope.aliyuncs.com` with `dashscope-intl.aliyuncs.com`.

Polling endpoint: `GET https://dashscope.aliyuncs.com/api/v1/tasks/{task_id}` — recommended interval 15s.

Normalized interface

Request

• `model` (string, required) — fixed `happyhorse-1.0-i2v`
• `input.prompt` (string, optional) — up to 5000 non-CJK / 2500 CJK characters
• `input.media` (array, required) — exactly one element with:
• `type`: `first_frame`
• `url`: public HTTP/HTTPS URL of the first-frame image
• `parameters.resolution` (string, optional) — `720P` or `1080P` (default: `1080P`)
• `parameters.duration` (integer, optional) — video length in seconds, range [3, 15] (default: 5)
• `parameters.watermark` (boolean, optional) — bottom-right "Happy Horse" watermark (default: `true`)
• `parameters.seed` (integer, optional) — range [0, 2147483647]

The output video aspect ratio follows the input first-frame image; **`ratio` is not supported** for i2v.

Media input limits

**First-frame image** (`type=first_frame`):

• Formats: JPEG, JPG, PNG, WEBP
• Resolution: width and height ≥ 300 pixels
• Aspect ratio: 1:2.5 ~ 2.5:1
• Max size: 10 MB

Response (task creation)

• `output.task_id` (string) — valid 24 hours
• `output.task_status` (string) — `PENDING` | `RUNNING` | `SUCCEEDED` | `FAILED` | `CANCELED` | `UNKNOWN`
• `request_id` (string)

Response (task result, on SUCCEEDED)

• `output.video_url` (string) — generated MP4 (H.264, 24fps) URL, valid 24 hours
• `output.orig_prompt` (string)
• `output.submit_time` / `output.scheduled_time` / `output.end_time` (string)
• `usage.duration` (integer) — billable duration in seconds
• `usage.output_video_duration` (integer)
• `usage.input_video_duration` (integer) — fixed 0 for i2v
• `usage.SR` (integer) — output resolution tier
• `usage.video_count` (integer) — fixed 1

Quick start (Python + HTTP)

import os
import time
import requests

API_KEY = os.getenv("DASHSCOPE_API_KEY")
BASE_URL = "https://dashscope.aliyuncs.com/api/v1"


def create_i2v_task(req: dict) -> str:
    """Create an image-to-video task and return task_id."""
    payload = {
        "model": "happyhorse-1.0-i2v",
        "input": {
            "prompt": req.get("prompt", ""),
            "media": [{"type": "first_frame", "url": req["first_frame_url"]}],
        },
        "parameters": {
            "resolution": req.get("resolution", "1080P"),
            "duration": req.get("duration", 5),
            "watermark": req.get("watermark", True),
        },
    }
    if req.get("seed") is not None:
        payload["parameters"]["seed"] = req["seed"]

    resp = requests.post(
        f"{BASE_URL}/services/aigc/video-generation/video-synthesis",
        headers={
            "Authorization": f"Bearer {API_KEY}",
            "Content-Type": "application/json",
            "X-DashScope-Async": "enable",
        },
        json=payload,
    )
    resp.raise_for_status()
    return resp.json()["output"]["task_id"]


def poll_task(task_id: str, interval: int = 15) -> dict:
    while True:
        resp = requests.get(
            f"{BASE_URL}/tasks/{task_id}",
            headers={"Authorization": f"Bearer {API_KEY}"},
        )
        resp.raise_for_status()
        data = resp.json()
        if data["output"]["task_status"] in ("SUCCEEDED", "FAILED", "CANCELED"):
            return data
        time.sleep(interval)

Usage examples

# Minimal — first-frame only
task_id = create_i2v_task({
    "first_frame_url": "https://cdn.translate.alibaba.com/r/wanx-demo-1.png",
    "prompt": "一只猫在草地上奔跑",
    "duration": 5,
})

# 720P with custom seed for reproducibility
task_id = create_i2v_task({
    "first_frame_url": "https://example.com/portrait.jpg",
    "prompt": "Slow head turn, soft window light",
    "resolution": "720P",
    "duration": 8,
    "seed": 42,
})

Error handling

| Error | Likely cause | Action | |---|---|---| | 401 / `InvalidApiKey` | Missing or invalid `DASHSCOPE_API_KEY` | Check env var or credentials file | | 400 `InvalidParameter` | Wrong resolution, duration out of [3,15], image too small or wrong format | Validate parameters and image | | `current user api does not support synchronous calls` | Missing `X-DashScope-Async: enable