Seedance 1.5 Pro Fast Video Extend turns short shots into longer clips with natural motion continuation and strong temporal consistency. Supports 4–12 s extensions, 720p/1080p output with built-in upscaling, and seed-reproducible results for shot matching. Ideal for ads, trailers, and short-drama beats. Production-ready REST API with fast response, no cold starts, and affordable pricing.
Bezczynny
$0.2za uruchomienie·~50 / $10
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Seedance V1.5 Pro Fast — Video Extend
Seedance V1.5 Pro Fast (Video Extend) extends an existing video into a longer clip while maintaining motion continuity, subject consistency, and scene coherence. Use a guiding prompt to control what happens next, choose duration and resolution, and optionally generate audio for the extended segment.
Why it stands out
- Smooth continuation that follows the original clip’s motion rhythm and visual style
- Prompt-guided extension to steer actions, mood, and camera behavior
- Resolution control with a simple cost multiplier (720p vs 1080p)
- Optional audio generation with transparent pricing impact
Key Capabilities
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Natural motion continuation Extends movement in a way that feels consistent with the input clip.
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Scene coherence preservation Keeps lighting, composition, and identity cues stable across the extension.
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Prompt-guided direction Describe what should happen next without rebuilding the scene from scratch.
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Optional audio generation Enable or disable audio generation (pricing differs).
Parameters
| Parameter | Description |
|---|---|
| video* | Input video (public URL or uploaded file reference, depending on client). |
| prompt* | Describe what should happen next and what must remain consistent. |
| duration | Output duration in seconds, up to 12s (allowed values depend on the endpoint configuration). |
| resolution | Output resolution: 720p or 1080p. |
| generate_audio | Whether to generate audio for the output video (true/false). |
| camera_fixed | Whether to fix the camera position (true/false). |
| seed | Random seed (-1 for random; set a fixed integer for reproducible results). |
Prompt Tips
Write prompts like a continuation director’s note:
- Action next: what happens after the input ends
- Motion intensity: subtle / smooth / dynamic / dramatic
- Camera behavior: fixed / slow pan / gentle zoom (if you care, say it)
- Consistency constraints: “keep the same character, outfit, lighting, framing”
Example prompts:
- Continue the scene with the woman giving a wink to the camera, keep the same lighting and framing, subtle motion, natural facial expression.
- Extend with a slow zoom out to reveal more of the environment while keeping the subject centered and the mood unchanged.
Pricing
Reference pricing (generate_audio = true)
| Resolution | Price per second | Example (5s) | Example (10s) |
|---|---|---|---|
| 720p | $0.04 | $0.20 | $0.40 |
| 1080p | $0.06 | $0.30 | $0.60 |
Reference pricing (generate_audio = false)
| Resolution | Price per second | Example (5s) | Example (10s) |
|---|---|---|---|
| 720p | $0.02 | $0.10 | $0.20 |
| 1080p | $0.03 | $0.15 | $0.30 |
Best Practices
- Use clean input videos (clear subject, stable exposure, minimal compression artifacts).
- Keep prompts specific but short, and state what must stay the same.
- Start with 5s to validate motion and framing before extending longer.
- Use 720p for fast preview iterations, then switch to 1080p for final.
- Set a fixed seed when you want consistent reruns while refining the prompt.
Use Cases
- Ad creative extension (turn short shots into longer deliverables)
- Social content variations (longer cuts from a base clip)
- Storytelling continuity (extend key moments with controlled motion)
- Marketing edits (extend hero scenes with stable aesthetics)
Notes
- The input video must be accessible to the runtime (public URL or valid uploaded reference).
- If motion drifts or changes too much, add stronger constraints: “keep face unchanged”, “keep camera fixed”, “same outfit and lighting”.
- Capability and allowed duration values can vary by deployment; rely on the endpoint’s UI/validator for the exact supported options.
Related Models
- Seedance V1.5 Pro Video Extend — Standard video extension option for stable, production-oriented continuation.
- Seedance V1.5 Pro (Text-to-Video Fast) — Generate new videos from text prompts with fast turnaround.
- Seedance V1.5 Pro (Image-to-Video Fast) — Animate a still image into video with fast generation speed.