Alibaba Happyhorse 1.1 Video Extend

Playground

Alibaba HappyHorse 1.1 Video Extend extends existing videos with seamless AI-generated continuation, supporting 720P / 1080P output while preserving visual continuity and motion consistency. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

Alibaba Happy Horse 1.1 Video Extend

Alibaba Happy Horse 1.1 Video Extend continues an existing video clip with new AI-generated footage, seamlessly extending the scene from where the original ends. Upload a source video, describe how the video should continue, and generate a coherent continuation in 720p or 1080p.

Need to edit an existing clip instead of extending it? Try Alibaba Happy Horse 1.0 Video Edit.
Need to generate a new video from text? Try Alibaba Happy Horse 1.1 Text-to-Video.

Why Choose This?

Seamless video continuation
Extend an existing clip with newly generated footage that picks up naturally from the original ending.
Prompt-guided scene progression
Describe how the action, camera movement, atmosphere, or story should continue using natural language.
Cinematic motion
Generate smooth, expressive motion while preserving the overall feel and flow of the source video.
Flexible resolution options
Choose 720p for lower-cost iteration or 1080p for higher-resolution output.
Production-ready API
Access the model through a REST inference API for scalable integration into creative workflows.

Parameters

Parameter	Required	Description
video	Yes	Source video to extend.
prompt	Yes	Text description of the desired continuation.
resolution	No	Output resolution: `720p` default or `1080p`.
duration	No	Total output duration in seconds. Range: `3–15`, default `5`.
seed	No	Random seed for reproducibility. Range: `0–2147483647`.

How to Use

Upload your source video — Provide the clip you want to continue.
Write your prompt — Describe how the scene, subject, camera, or atmosphere should progress after the original ending.
Choose resolution — Use 720p for lower-cost iteration or 1080p for higher-resolution output.
Set duration — Choose the total output duration between 3 and 15 seconds.
Set a seed optional — Use a fixed seed if you want more reproducible results.
Submit — Generate and download the extended video.

Example Prompt

Continue the scene with a slow forward camera movement, the subject walking deeper into the alley, soft rain beginning to fall, stronger reflections on the ground, and a cinematic moody nighttime atmosphere.

Pricing

Per 5 Seconds

Resolution	Cost
720p	$0.70
1080p	$0.945

Per Second

Resolution	Cost
720p	$0.14
1080p	$0.189

Example Costs

Resolution	3s	5s	10s	15s
720p	$0.42	$0.70	$1.40	$2.10
1080p	$0.567	$0.945	$1.89	$2.835

Best Use Cases

Scene continuation — Extend cinematic clips with natural motion and coherent progression.
Storyboarding and concept work — Explore how a shot or sequence might continue without manual video production.
Ad creative development — Expand short promo clips into longer variations for campaigns and testing.
Social media content — Create longer edits from short source footage for platform-specific needs.
Atmospheric scene building — Continue motion, lighting, and mood from an existing clip into a richer sequence.
Creative prototyping — Quickly test alternate continuations before investing in full production.

Pro Tips

Use a source video with a clear ending frame for smoother continuation.
Be explicit about what should happen next, including subject action, camera motion, lighting, and atmosphere.
Keep prompts visually concrete, such as “camera slowly pushes in,” “the subject turns and walks away,” or “fog begins to roll in.”
Use 720p for quick testing, then switch to 1080p for higher-resolution output.
Reuse the same seed when you want more reproducible generations.
Start with shorter durations to validate continuity before generating longer clips.

Alibaba Happy Horse 1.0 Video Edit — Perform prompt-driven editing on existing videos.
Alibaba Happy Horse 1.1 Text-to-Video — Generate cinematic videos directly from natural-language prompts.
Alibaba Happy Horse 1.1 Image-to-Video — Animate a single reference image into a cinematic clip.



<ApiPage model={model}>
  ## Authentication

  For authentication details, please refer to the [Authentication Guide](/docs-authentication).

  ## API Endpoints

  ### Submit Task & Query Result

  ## Parameters

  ### Task Submission Parameters

  #### Request Parameters

  #### Response Parameters

  <SubmitResponse />

  #### Result Request Parameters

  | Parameter | Type | Required | Default | Description |
  |-----------|------|----------|---------|-------------|
  | id | string | Yes | - | Task ID |

  #### Result Response Parameters

  | Parameter | Type | Description |
  |-----------|------|-------------|
  | code | integer | HTTP status code (e.g., 200 for success) |
  | message | string | Status message (e.g., "success") |
  | data | object | The prediction data object containing all details |
  | data.id | string | Unique identifier for the prediction, the ID of the prediction to get |
  | data.model | string | Model ID used for the prediction |
  | data.outputs | object | Array of URLs to the generated content. |
  | data.urls | object | Object containing related API endpoints |
  | data.urls.get | string | URL to retrieve the prediction result |
  | data.status | string | Status of the task: `created`, `processing`, `completed`, or `failed` |
  | data.created_at | string | ISO timestamp of when the request was created (e.g., "2023-04-01T12:34:56.789Z") |
  | data.error | string | Error message (empty if no error occurred) |
  | data.timings | object | Object containing timing details |
  | data.timings.inference | integer | Inference time in milliseconds |

</ApiPage>

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