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Video specifications: Fixed 5-second duration and custom resolution (480P/720P/1080P).
Additional capabilities: Prompt rewriting and watermarking.

Quick links: API reference | Prompt guide

Getting started

Prompt	First frame	Last frame	Output video
A cute blue monster with a slightly sad expression stands in the rain. The camera slowly zooms in and stops on the moment it looks up at the sky.

Before calling the API: Get an API key, set it as an environment variable, and install the DashScope SDK.

Python SDK
Java SDK
curl

Requires DashScope Python SDK ≥ 1.25.8 before running the code below. Older versions may show "url error, please check url!" errors. Install the SDK.

import os
from http import HTTPStatus
from dashscope import VideoSynthesis
import dashscope

# The following URL is for the Singapore region. When calling, replace {WorkspaceId} with your actual workspace ID. URLs vary by region. Get your URL: https://www.alibabacloud.com/help/en/model-studio/image-to-video-by-first-and-last-frame-api-reference
dashscope.base_http_api_url = 'https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1'
# API keys differ by region. Get your API key: https://www.alibabacloud.com/help/en/model-studio/get-api-key
api_key = os.getenv("DASHSCOPE_API_KEY", "YOUR_API_KEY")

print('please wait...')
rsp = VideoSynthesis.call(api_key=api_key,
                          model="wan2.2-kf2v-flash",
                          prompt="A cute blue monster with a slightly sad expression stands in the rain. The camera slowly zooms in and stops on the moment it looks up at the sky.",
                          first_frame_url="https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260126/ixdxvt/wan-kf2v-blue-1.png",
                          last_frame_url="https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260126/nhtdrc/wan-kf2v-blue-2.png",
                          duration=5,  # Fixed at 5 seconds. Do not change.
                          prompt_extend=True,
                          watermark=True)
print(rsp)
if rsp.status_code == HTTPStatus.OK:
    print("video_url:", rsp.output.video_url)
else:
    print('Failed, status_code: %s, code: %s, message: %s' % (rsp.status_code, rsp.code, rsp.message))

Requires DashScope Java SDK ≥ 2.22.6 before running the code below. Older versions may show "url error, please check url!" errors. Install the SDK.

import com.alibaba.dashscope.aigc.videosynthesis.VideoSynthesis;
import com.alibaba.dashscope.aigc.videosynthesis.VideoSynthesisParam;
import com.alibaba.dashscope.aigc.videosynthesis.VideoSynthesisResult;
import com.alibaba.dashscope.exception.ApiException;
import com.alibaba.dashscope.exception.InputRequiredException;
import com.alibaba.dashscope.exception.NoApiKeyException;
import com.alibaba.dashscope.utils.JsonUtils;
import com.alibaba.dashscope.utils.Constants;

public class Image2Video {

    static {
        // The following URL is for the Singapore region. When calling, replace {WorkspaceId} with your actual workspace ID. URLs vary by region. Get your URL: https://www.alibabacloud.com/help/en/model-studio/image-to-video-by-first-and-last-frame-api-reference
        Constants.baseHttpApiUrl = "https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1";
    }

    // If you have not set an environment variable, replace the line below with: apiKey="sk-xxx"
    // API keys differ by region. Get your API key: https://www.alibabacloud.com/help/en/model-studio/get-api-key
    static String apiKey = System.getenv("DASHSCOPE_API_KEY");

    public static void image2video() throws ApiException, NoApiKeyException, InputRequiredException {
        VideoSynthesis vs = new VideoSynthesis();
        VideoSynthesisParam param =
                VideoSynthesisParam.builder()
                        .apiKey(apiKey)
                        .model("wan2.2-kf2v-flash")
                        .prompt("A cute blue monster with a slightly sad expression stands in the rain. The camera slowly zooms in and stops on the moment it looks up at the sky.")
                        .firstFrameUrl("https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260126/ixdxvt/wan-kf2v-blue-1.png")
                        .lastFrameUrl("https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260126/nhtdrc/wan-kf2v-blue-2.png")
                        .resolution("720P")
                        .promptExtend(true)
                        .watermark(true)
                        .build();
        System.out.println("please wait...");
        VideoSynthesisResult result = vs.call(param);
        System.out.println(JsonUtils.toJson(result));
    }

    public static void main(String[] args) {
        try {
            image2video();
        } catch (ApiException | NoApiKeyException | InputRequiredException e) {
            System.out.println(e.getMessage());
        }
        System.exit(0);
    }
}

Step 1: Create a task to get the task ID

curl --location 'https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/services/aigc/image2video/video-synthesis' \
    -H 'X-DashScope-Async: enable' \
    -H "Authorization: Bearer $DASHSCOPE_API_KEY" \
    -H 'Content-Type: application/json' \
    -d '{
    "model": "wan2.2-kf2v-flash",
    "input": {
        "first_frame_url": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260126/ixdxvt/wan-kf2v-blue-1.png",
        "last_frame_url": "https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/zh-CN/20260126/nhtdrc/wan-kf2v-blue-2.png",
        "prompt": "A cute blue monster with a slightly sad expression stands in the rain. The camera slowly zooms in and stops on the moment it looks up at the sky."
    },
    "parameters": {
        "resolution": "720P",
        "prompt_extend": true,
        "watermark": true
    }
}'

Step 2: Get the result using the task IDReplace {task_id} with the task_id value returned by the previous API call. The task_id is valid for queries for 24 hours, Replace {WorkspaceId} with your actual workspace ID.

curl -X GET https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/tasks/{task_id} \
--header "Authorization: Bearer $DASHSCOPE_API_KEY"

Sample output

video_url expires after 24 hours. Download the video promptly.

{
    "request_id": "c1209113-8437-424f-a386-xxxxxx",
    "output": {
        "task_id": "966cebcd-dedc-4962-af88-xxxxxx",
        "task_status": "SUCCEEDED",
        "video_url": "https://dashscope-result-sh.oss-accelerate.aliyuncs.com/xxx.mp4?Expires=xxx",
         ...
    },
    ...
}

Availability

Supported models vary by region. Resources are isolated between regions. For supported models in each region, see the Model Studio console.
When making a call, make sure your model, endpoint URL, and API key all belong to the same region. Cross-region calls fail.

Sample codes in this topic apply to the Singapore region.

Core capabilities

Generate video from first and last frames

Supported models: All models. Generates smooth videos from first-frame and last-frame images. Parameters:

first_frame_url: Required. Provide the first-frame image.
last_frame_url: Required. Provide the last-frame image.
prompt: Optional (recommended). Controls how the video changes over time.

Prompt	First frame	Last frame	Output video
Realistic style. A curious black kitten looks up at the sky. The camera starts at eye level and gradually rises until it captures the kitten’s curious gaze from above.

Python SDK
Java SDK
curl

Requires DashScope Python SDK ≥ 1.25.8. Upgrade if needed.

import os
from http import HTTPStatus
from dashscope import VideoSynthesis
import dashscope

# The following URL is for the Singapore region. When calling, replace {WorkspaceId} with your actual workspace ID. URLs vary by region. Get your URL: https://www.alibabacloud.com/help/en/model-studio/image-to-video-by-first-and-last-frame-api-reference
dashscope.base_http_api_url = 'https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1'
# API keys differ by region. Get your API key: https://www.alibabacloud.com/help/en/model-studio/get-api-key
api_key = os.getenv("DASHSCOPE_API_KEY", "YOUR_API_KEY")

def sample_async_call_kf2v():
    # Asynchronous call returns a task_id
    rsp = VideoSynthesis.async_call(api_key=api_key,
                                    model="wan2.2-kf2v-flash",
                                    prompt="Realistic style. A curious black kitten looks up at the sky. The camera starts at eye level and gradually rises until it captures the kitten’s curious gaze from above.",
                                    first_frame_url="https://wanx.alicdn.com/material/20250318/first_frame.png",
                                    last_frame_url="https://wanx.alicdn.com/material/20250318/last_frame.png",
                                    duration=5,  # Fixed at 5 seconds. Do not change.
                                    prompt_extend=True,
                                    watermark=True)
    print(rsp)
    if rsp.status_code == HTTPStatus.OK:
        print("task_id: %s" % rsp.output.task_id)
    else:
        print('Failed, status_code: %s, code: %s, message: %s' % (rsp.status_code, rsp.code, rsp.message))

    # Wait for asynchronous task to complete
    rsp = VideoSynthesis.wait(task=rsp, api_key=api_key)
    print(rsp)
    if rsp.status_code == HTTPStatus.OK:
        print(rsp.output.video_url)
    else:
        print('Failed, status_code: %s, code: %s, message: %s' % (rsp.status_code, rsp.code, rsp.message))

if __name__ == '__main__':
    sample_async_call_kf2v()

Requires DashScope Java SDK ≥ 2.22.6. Upgrade if needed.

import com.alibaba.dashscope.aigc.videosynthesis.VideoSynthesis;
import com.alibaba.dashscope.aigc.videosynthesis.VideoSynthesisParam;
import com.alibaba.dashscope.aigc.videosynthesis.VideoSynthesisResult;
import com.alibaba.dashscope.exception.ApiException;
import com.alibaba.dashscope.exception.InputRequiredException;
import com.alibaba.dashscope.exception.NoApiKeyException;
import com.alibaba.dashscope.utils.JsonUtils;
import com.alibaba.dashscope.utils.Constants;

public class Image2Video {

    static {
        // The following URL is for the Singapore region. When calling, replace {WorkspaceId} with your actual workspace ID. URLs vary by region. Get your URL: https://www.alibabacloud.com/help/en/model-studio/image-to-video-by-first-and-last-frame-api-reference
        Constants.baseHttpApiUrl = "https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1";
    }

    // If you have not set an environment variable, replace the line below with: apiKey="sk-xxx"
    // API keys differ by region. Get your API key: https://www.alibabacloud.com/help/en/model-studio/get-api-key
    static String apiKey = System.getenv("DASHSCOPE_API_KEY");

    public static void image2video() throws ApiException, NoApiKeyException, InputRequiredException {
        VideoSynthesis vs = new VideoSynthesis();
        VideoSynthesisParam param =
                VideoSynthesisParam.builder()
                        .apiKey(apiKey)
                        .model("wan2.2-kf2v-flash")
                        .prompt("Realistic style. A curious black kitten looks up at the sky. The camera starts at eye level and gradually rises until it captures the kitten’s curious gaze from above.")
                        .firstFrameUrl("https://wanx.alicdn.com/material/20250318/first_frame.png")
                        .lastFrameUrl("https://wanx.alicdn.com/material/20250318/last_frame.png")
                        .resolution("720P")
                        .promptExtend(true)
                        .watermark(true)
                        .build();
        // Asynchronous call
        VideoSynthesisResult task = vs.asyncCall(param);
        System.out.println(JsonUtils.toJson(task));
        System.out.println("please wait...");

        // Get result
        VideoSynthesisResult result = vs.wait(task, apiKey);
        System.out.println(JsonUtils.toJson(result));
    }

    public static void main(String[] args) {
        try {
            image2video();
        } catch (ApiException | NoApiKeyException | InputRequiredException e) {
            System.out.println(e.getMessage());
        }
        System.exit(0);
    }
}

Step 1: Create a task to get the task ID

curl --location 'https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/services/aigc/image2video/video-synthesis' \
    -H 'X-DashScope-Async: enable' \
    -H "Authorization: Bearer $DASHSCOPE_API_KEY" \
    -H 'Content-Type: application/json' \
    -d '{
    "model": "wan2.2-kf2v-flash",
    "input": {
        "first_frame_url": "https://wanx.alicdn.com/material/20250318/first_frame.png",
        "last_frame_url": "https://wanx.alicdn.com/material/20250318/last_frame.png",
        "prompt": "Realistic style. A curious black kitten looks up at the sky. The camera starts at eye level and gradually rises until it captures the kitten’s curious gaze from above."
    },
    "parameters": {
        "resolution": "720P",
        "prompt_extend": true,
        "watermark": true
    }
}'

curl -X GET https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1/tasks/{task_id} \
--header "Authorization: Bearer $DASHSCOPE_API_KEY"

Input image

Number of images: One first-frame image and one last-frame image.
Input methods: Image URL, local file path.

Method 1: Image URL (HTTP API and SDK) Recommended

Public URL: HTTP or HTTPS (e.g., https://xxxx/xxx.png).

Method 2: Local file path (SDK only)

Path requirements differ by language:Python SDK: Supports absolute and relative paths.

Operating system	Input file path	Example (absolute path)	Example (relative path)
Linux / macOS	file://{absolute or relative path}	file:///home/images/test.png	file://./images/test.png
Windows	file://{absolute or relative path}	file://D:/images/test.png	file://./images/test.png

Java SDK: Supports absolute paths only.

Operating system	Input file path	Example (absolute path)
Linux / macOS	file://{absolute path}	file:///home/images/test.png
Windows	file:///{absolute path}	file:///D:/images/test.png

Sample code: Multiple image input methods

Python SDK

import os
from http import HTTPStatus
# DashScope SDK >= 1.23.4
from dashscope import VideoSynthesis
import dashscope

dashscope.base_http_api_url = 'https://{WorkspaceId}.ap-southeast-1.maas.aliyuncs.com/api/v1'

# Get the DashScope API key (which is your Model Studio API key) from an environment variable.
api_key = os.getenv("DASHSCOPE_API_KEY")

# ========== Image input method (choose one) ==========
# [Method 1] Use a public image URL
first_frame_url = "https://wanx.alicdn.com/material/20250318/first_frame.png"
last_frame_url = "https://wanx.alicdn.com/material/20250318/last_frame.png"

# [Method 2] Use a local file path (file:// + file path)
# Use an absolute path:
# first_frame_url = "file://" + "/path/to/your/first_frame.png"  # Linux/macOS
# last_frame_url = "file://" + "C:/path/to/your/last_frame.png"  # Windows
# Or use a relative path:
# first_frame_url = "file://" + "./first_frame.png"              # Use your actual path.
# last_frame_url = "file://" + "./last_frame.png"                # Use your actual path.

def sample_sync_call_kf2v():
    print('please wait...')
    rsp = VideoSynthesis.call(api_key=api_key,
                              model="wan2.2-kf2v-flash",
                              prompt="Realistic style, a small black cat looks up at the sky curiously, the camera gradually rises from eye level, and finally captures its curious gaze from a top-down view.",
                              first_frame_url=first_frame_url,
                              last_frame_url=last_frame_url,
                              resolution="720P",
                              prompt_extend=True)
    print(rsp)
    if rsp.status_code == HTTPStatus.OK:
        print(rsp.output.video_url)
    else:
        print('Failed, status_code: %s, code: %s, message: %s' %
              (rsp.status_code, rsp.code, rsp.message))

if __name__ == '__main__':
    sample_sync_call_kf2v()

Output video

Number of videos: One.
Specifications: Specifications vary by model. See Video specifications.
URL expiration: 24 hours.
Dimensions: Determined by the first-frame image and the resolution setting.
- The model preserves the first-frame's aspect ratio and scales total pixel count to the target. Output dimensions are adjusted automatically to be divisible by 16 (encoding requirement).
- Example: 750×1000 input (3:4) with resolution="720P" (target ≈920K pixels) may output 816×1104 (≈0.739 ratio, ≈900K pixels, both divisible by 16).

Billing and rate limiting

For free quota and pricing details, see Wanx-Image-to-Video-First-Last-Frame.
For model rate limiting, see Wanxiang series.
Billing details:
- Input is free. Output billing is based on successful video seconds generated.
- Failed calls incur no charges and don't consume free quota.
- Image-to-video also supports savings plans.

API reference

Image-to-video - first and last frames - API reference

FAQ

Q: How do I generate a video with a specific aspect ratio (such as 3:4)?

A: The API doesn't support direct aspect ratio control -- only resolution. The resolution parameter controls pixel count, not aspect ratio. The model preserves the first-frame's aspect ratio (first_frame_url) with minor adjustments for encoding (dimensions must be multiples of 16). For 3:4 video, upload a 3:4 first-frame image.

Example: 750×1000 input (3:4) with resolution="720P" (target ≈920K pixels) may output 816×1104 (≈0.739 ratio, ≈900K pixels, both divisible by 16).

Q: Why do I get a “url error, please check url!” error when running the SDK code?

A: Ensure your SDK version meets the minimum requirement: DashScope Python SDK ≥ 1.25.8 or DashScope Java SDK ≥ 2.22.6. Older versions may show "url error, please check url!" errors. Upgrade the SDK.

​Getting started

​Availability

​Core capabilities

​Generate video from first and last frames

​Input image

​Sample code: Multiple image input methods

​Output video

​Billing and rate limiting

​API reference

​FAQ

​Q: How do I generate a video with a specific aspect ratio (such as 3:4)?

​Q: Why do I get a “url error, please check url!” error when running the SDK code?

Getting started

Availability

Core capabilities

Generate video from first and last frames

Input image

Sample code: Multiple image input methods

Output video

Billing and rate limiting

API reference

FAQ

Q: How do I generate a video with a specific aspect ratio (such as 3:4)?

Q: Why do I get a “url error, please check url!” error when running the SDK code?