Seedance 2.0 Fast Video-Extend
Seedance 2.0 Fast Video-Extend is the faster, cheaper tier of Seedance 2.0 Video-Extend. It appends a new cinematic continuation to an existing video by generating a fresh segment from the input video's last frame and a natural-language prompt, then concatenating original and new segment into a single output.
Key Features
- Seamless continuation — Generation starts from the input video's last frame so the join is visually consistent.
- Optional target last frame — Provide
last_image to steer the new segment toward a specific end frame.
- Director-level control — Camera movement, lighting, shadows, and character performance via prompts.
- Native audio synchronization — Audio from both the original video and the new segment are preserved in the final output.
- Faster, cheaper — ~17% cheaper than the standard Seedance 2.0 Video-Extend at every resolution.
Parameters
| Parameter | Required | Description |
|---|
| prompt | Yes | Describe the cinematic continuation. |
| video | Yes | Input video URL. Generation continues from the last frame. |
| last_image | No | Optional target last-frame URL. Interpolates from the input's last frame to this image. |
| duration | No | Length in seconds of the new segment (4-15, default 5). |
| resolution | No | 480p, 720p (default), or 1080p. |
| enable_web_search | No | Enable web search for real-time context. |
How to Use
- Upload the input video. The new segment will be appended to it.
- Write the prompt. Describe the continuation in cinematic detail.
- (Optional) Upload a target last frame. The new segment will interpolate to this image.
- Pick a duration and resolution.
- Run. Receive the original video plus the new segment concatenated into one output.
Pricing
Billed per second of the new segment only. Resolution multipliers match Seedance 2.0 Fast image-to-video.
| Resolution | Per second |
|---|
| 480p | $0.10 |
| 720p | $0.20 |
| 1080p | $0.50 |
Examples (5s extension):
| Resolution | Cost |
|---|
| 480p | $0.50 |
| 720p | $1.00 |
| 1080p | $2.50 |
Notes
- Pricing is based on the new segment length only — the input video is not re-billed.
- Aspect ratio of the new segment matches the input video's last frame automatically.
- Native audio generation is included for the new segment; the original video's audio is preserved.
Related Models
- Seedance 2.0 Video-Extend — Standard tier of this model.
- Seedance 2.0 Fast Image-to-Video — Fast image-to-video generation.
- Seedance 2.0 Fast Video-Edit — Fast video-edit at 480p / 720p / 1080p.