Seedance 2.5 Video Extend: AI Video Editor
Extend an existing video with a new cinematic continuation using Seedance 2.5 Video Extend. Try free — pay per generation.
Extend an existing video with a new cinematic continuation using Seedance 2.5 Video Extend. Try free — pay per generation.
About this model
Seedance 2.5 Video Extend is the video-extension endpoint in the Seedance 2.5 family. It extends an input video with a new cinematic continuation generated from its last frame and a natural-language prompt, optionally interpolating toward a target end frame. Output resolution is 720p.
Cost analysis
| Provider | Cost | Notes |
|---|---|---|
| muapiapp | $0.221/sec (720p) | Billed on the combined duration of the input video plus the generated continuation, at 65% of the base per-second rate. |
Billed on the combined duration of the input video plus the generated continuation, at 65% of the base per-second rate.
* Competitor pricing is estimated based on similar model architectures and usage tiers.
Configuration schema
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt | string | Desired cinematic continuation — action, camera movement, lighting, mood. | The car keeps driving down the coastal road as the sun sets, camera slowly pulling back. |
| Video | string | URL of the video to extend. Generation continues from its last frame. | https://cdn.muapi.ai/assets/seedance-2.5-video-extend-in.mp4 |
| Last Image | string | Optional target frame URL. When set, the continuation interpolates from the input video's final frame toward this image. | undefined |
| Duration | int | Length of the extension clip in seconds. | 5 |
| Aspect Ratio | Enum (7 options) | Aspect ratio of the output video. | 16:9 |
| Generate Audio | boolean | Whether to generate synchronized audio for the new segment. | true |
| Seed | int | Random seed for reproducible generation. Use -1 for random. | 42 |
Desired cinematic continuation — action, camera movement, lighting, mood.
The car keeps driving down the coastal road as the sun sets, camera slowly pulling back.URL of the video to extend. Generation continues from its last frame.
https://cdn.muapi.ai/assets/seedance-2.5-video-extend-in.mp4Optional target frame URL. When set, the continuation interpolates from the input video's final frame toward this image.
undefinedLength of the extension clip in seconds.
5Aspect ratio of the output video.
16:9Whether to generate synchronized audio for the new segment.
trueRandom seed for reproducible generation. Use -1 for random.
42Developer documentation
Provide the Source Video
video URL. Generation continues from its last frame.Describe the Continuation
prompt.Optional Target Frame
last_image to interpolate from the input video's final frame toward a specific target image.Configure Output
duration (4–30s) for the length of the new segment, aspect_ratio, generate_audio, and optionally seed.Submit via the API
curl -X POST https://api.muapi.ai/api/v1/seedance-2.5-video-extend \
-H "x-api-key: YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"prompt": "The car keeps driving down the coastal road as the sun sets, camera slowly pulling back.",
"video": "https://example.com/input.mp4",
"duration": 5
}'
GET /api/v1/predictions/{request_id}/result until status is completed, then retrieve the video URL from output.Frequently asked
It generates a new cinematic continuation appended to an input video, starting from that video's last frame and guided by a text prompt.
An optional target frame URL. When set, the continuation interpolates from the input video's final frame toward this image instead of following the prompt alone.
Billed at 65% of the base per-second rate ($0.221/sec at 720p) on the combined duration of the input video plus the generated continuation, since a video reference is always present.
Between 4 and 30 seconds, configurable via the `duration` parameter.
Yes by default — set `generate_audio` to `false` to skip generating synchronized audio for the new segment.