Alibaba Happy Horse 1.0 Video Extend
Alibaba Happy Horse 1.0 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 the model generates 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 1.0 Text-to-Video.
Why Choose This?
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Seamless video continuation
Extend an existing clip with newly generated footage that picks up naturally from the original ending.
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Prompt-guided scene progression
Describe how the action, camera movement, atmosphere, or story should continue using natural language.
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Cinematic motion
Generate smooth, expressive motion while preserving the overall feel and flow of the source video.
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Flexible resolution options
Choose 720p for lower-cost iteration or 1080p for higher-quality final output.
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Production-ready API
Access the model through a REST inference API with no cold starts 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-quality results.
- 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 | $1.40 |
Example Costs
| Resolution | 3s | 5s | 10s | 15s |
|---|
| 720p | $0.42 | $0.70 | $1.40 | $2.10 |
| 1080p | $0.84 | $1.40 | $2.80 | $4.20 |
Billing Rules
- Base price:
720p costs $0.70 per 5 seconds
- 1080p surcharge:
1080p costs 2× the 720p rate
- Total price formula:
total_price = 0.70 × (resolution == "1080p" ? 2 : 1) × duration / 5
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 final-quality output.
- Reuse the same
seed when you want more reproducible generations.
- Start with shorter durations to validate continuity before generating longer clips.
Notes
- Both
video and prompt are required.
- Ensure video URLs are publicly accessible.
- Supported resolutions are
720p and 1080p.
- Supported total output duration is
3–15 seconds.
- Pricing scales linearly with
duration.
1080p pricing is exactly 2× the 720p rate.
Related Models
- Alibaba Happy Horse 1.0 Video Edit — Perform prompt-driven editing on existing videos.
- Alibaba Happy Horse 1.0 Text-to-Video — Generate cinematic videos directly from natural-language prompts.
- Alibaba Happy Horse 1.0 Image-to-Video — Animate a single reference image into a cinematic clip.