~/Seedance 1.5 Pro Video Extend Fast
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Video to Video

Seedance 1.5 Pro Video Extend Fast

Extend videos with natural motion continuation.

Schema

Hint: You can drag and drop a file or click to upload

Example

Input

Video

Sample output shown above. The prompt and settings are pre-filled on the left.

Your request will cost $0.40 per run. For $10 you can run this model approximately 25 times.

One more thing:

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README

ByteDance / Seedance 1.5 Pro Video Extend Fast — Video to Video (seedance-1.5-pro-video-extend-fast)

Seedance 1.5 Pro Fast Video Extend turns short shots into longer clips with natural motion continuation and strong temporal consistency. Ideal for ads, trailers, and short-drama beats.

Highlights

  • •Natural motion continuation – Extends movement in a way that feels consistent with the input clip.
  • •Temporal consistency – Maintains scene coherence throughout the extension.
  • •Prompt-guided – Describe what should happen next for controlled continuation.
  • •Audio generation – Optionally generate audio for the extended portion.
  • •Seed reproducible – Use seeds for consistent, reproducible results.

Parameters

  • •video* – Source video to extend
  • •prompt* – Description of what should happen next in the video
  • •duration – Extension duration in seconds
    • • 4 seconds
    • • 6 seconds
    • • 8 seconds
    • • 10 seconds
    • • 12 seconds
  • •resolution – Output video resolution
    • • 720p
    • • 1080p
  • •generate_audio – Generate audio for the extended portion
  • •camera_fixed – Fix camera position during extension
  • •seed – Random seed for reproducibility (-1 for random)

Pricing

$0.40 per generation

ResolutionPrice
720p (with audio)$0.04
1080p (with audio)$0.06
720p (no audio)$0.02
1080p (no audio)$0.03

How to Use

  1. 1.Upload your source video.
  2. 2.Write a prompt describing what should happen next.
  3. 3.Select duration (4-12 seconds) and resolution.
  4. 4.Optionally enable/disable audio generation.
  5. 5.Generate and download the extended video.

More Models to Try

•Ads and trailers: Extend short clips into longer promotional content.
•Short-drama beats: Continue scenes with natural flow.
•Social media: Turn brief moments into engaging videos.
•Shot matching: Use seed for reproducible extensions across shots.

Related Guides

Best AI Video APIs ComparedText to Video API GuideBest AI API Platforms 2026AI API Pricing Comparison

Frequently Asked Questions

What is the Seedance 1.5 Pro Video Extend Fast API?
Extend videos with natural motion continuation.
How much does Seedance 1.5 Pro Video Extend Fast cost via API?
Seedance 1.5 Pro Video Extend Fast costs $0.4000 per generation through Renderful's API. No subscription required — pay only for what you use.
How do I use Seedance 1.5 Pro Video Extend Fast via API?
Sign up for a free Renderful API key, then send a POST request to the /v1/predictions endpoint with model "seedance-1.5-pro-video-extend-fast". See the documentation at renderful.ai/docs for code examples in Python, JavaScript, and cURL.
What type of content does Seedance 1.5 Pro Video Extend Fast generate?
Seedance 1.5 Pro Video Extend Fast is a video to video model by ByteDance. Key features include: 4-12s extension, Video input, 720p/1080p.
Is the Seedance 1.5 Pro Video Extend Fast API fast?
Seedance 1.5 Pro Video Extend Fast has fast generation speed. Results are delivered via polling or webhook callback for seamless integration.