Seedance 2.0 (Video-Extend) extends an input video with a new cinematic continuation generated from its last frame and a natural-language prompt. Ready-to-use REST API, best performance, no coldstarts, affordable pricing.
Bezczynny
$0.6za uruchomienie·~16 / $10
PrzykładyZobacz wszystkie
Continue the existing subway train scene seamlessly. Keep the same passengers, same seating positions, same clothing, same faces, same subway carriage layout, same lighting, same handrails, same doors, and same route display above the door. The route display text “NEXT STOP: CENTRAL STATION” remains stable, correctly spelled, readable, and unchanged throughout the video. The train continues moving smoothly, causing a gentle natural sway in the passengers and hanging straps. The office worker keeps looking at his phone, the student listens to music, the elderly man holds the handrail, the mother adjusts her grocery bag, and two friends talk softly near the door. Reflections move subtly across the windows, fluorescent lights remain steady, the camera gently sways with the motion of the train, realistic body movement, stable faces, natural commute atmosphere, documentary realism, 4K, 24fps.
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README
Seedance 2.0 Video-Extend
Seedance 2.0 Video-Extend appends a new cinematic continuation to an existing video. The model generates a fresh segment from the input video's last frame and a natural-language prompt, then the original and new segment are concatenated 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_imageto 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.
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 image-to-video.
| Resolution | Per second |
|---|---|
| 480p | $0.12 |
| 720p | $0.24 |
| 1080p | $0.60 |
Examples (5s extension):
| Resolution | Cost |
|---|---|
| 480p | $0.60 |
| 720p | $1.20 |
| 1080p | $3.00 |
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 Image-to-Video — Generate video from a reference image and prompt.
- Seedance 2.0 Video-Edit — Edit an existing video instead of extending it.
- Seedance 2.0 Fast Video-Extend — Faster, cheaper variant.
Seedance 2.0 Video Extend API — Quick start
Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0/video-extend with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to completed, then read the output URL from data.outputs[0]. Examples for Seedance 2.0 Video Extend below.
HTTP example
# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0/video-extend" \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $WAVESPEED_API_KEY" \
-d '{
"prompt": "A cinematic shot of a city at sunset, soft golden light",
"video": "https://example.com/your-input.mp4",
"resolution": "720p",
"duration": 5,
"enable_web_search": false,
"generate_audio": true
}'
# Response includes a prediction id. Poll for the result:
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
-H "Authorization: Bearer $WAVESPEED_API_KEY"
# When status is "completed", read the output from data.outputs[0].Node.js example
// npm install wavespeed
const WaveSpeed = require('wavespeed');
const client = new WaveSpeed(); // reads WAVESPEED_API_KEY from env
const result = await client.run("bytedance/seedance-2.0/video-extend", {
"prompt": "A cinematic shot of a city at sunset, soft golden light",
"video": "https://example.com/your-input.mp4",
"resolution": "720p",
"duration": 5,
"enable_web_search": false,
"generate_audio": true
});
console.log(result.outputs[0]); // → URL of the generated outputPython example
# pip install wavespeed
import wavespeed
output = wavespeed.run(
"bytedance/seedance-2.0/video-extend",
{
"prompt": "A cinematic shot of a city at sunset, soft golden light",
"video": "https://example.com/your-input.mp4",
"resolution": "720p",
"duration": 5,
"enable_web_search": false,
"generate_audio": true
}
)
print(output["outputs"][0]) # → URL of the generated outputSeedance 2.0 Video Extend API — Frequently asked questions
What is the Seedance 2.0 Video Extend API?
Seedance 2.0 Video Extend is a ByteDance model for video extension, exposed as a REST API on WaveSpeedAI. Seedance 2.0 (Video-Extend) extends an input video with a new cinematic continuation generated from its last frame and a natural-language prompt. Ready-to-use REST API, best performance, no coldstarts, affordable pricing. You can call it programmatically or try it from the playground above.
How do I call the Seedance 2.0 Video Extend API?
POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID; poll the prediction endpoint until status flips to "completed", then read the output URL from the result. The playground generates a ready-to-paste code sample in Python, JavaScript, or cURL for whatever inputs you've set. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/bytedance/bytedance-seedance-2.0-video-extend.
How much does Seedance 2.0 Video Extend cost per run?
Seedance 2.0 Video Extend starts at $0.60 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.
What inputs does Seedance 2.0 Video Extend accept?
Key inputs: `prompt`, `video`, `resolution`, `duration`, `enable_web_search`, `generate_audio`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/bytedance/bytedance-seedance-2.0-video-extend.
How do I get started with the Seedance 2.0 Video Extend API?
Sign up for a free WaveSpeedAI account to claim starter credits, copy your API key from /accesskey, then call the endpoint shown in the API tab of the playground. The playground also auto-generates a code sample in Python, JavaScript, or cURL for the parameters you've set.
Can I use Seedance 2.0 Video Extend outputs commercially?
Commercial usage rights depend on the model's license, set by its provider (ByteDance). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.