Seedance 2.5 Reference to Video

POST/v1/run

ByteDance's next-generation reference-to-video model, generating video from multimodal references (images, videos, audio) and locking a character, set, and palette across a full take up to 30 seconds for production-grade consistency.

Request body

Submit an async generation request. The model field selects the model; other fields are model-specific input parameters.

stringmodelrequired

Model identifier. Set to bytedance/seedance/2.5/reference-to-video.

Default: bytedance/seedance/2.5/reference-to-video

stringpromptrequired

The text prompt to generate a video from.

Default: Use Image1 as the visual reference and Video1 as the motion reference. Create a peaceful cinematic shoreline scene with rolling ocean waves at golden hour, soft foam, natural water movement, and no people.

Optional<array<string>>images

The URLs of reference images to guide video generation. Refer to them in the prompt as @Image1, @Image2, etc.

Optional<array<string>>videos

The URLs of reference videos to guide video generation. Up to 10 MP4 or MOV files; combined duration must not exceed 30 seconds.

Optional<array<string>>audios

The URLs of reference audio files to guide video generation.

Optional<integer>duration

The duration of the generated video in seconds (4-30).

Allowed values: 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

Default: 5

Optional<string>aspect_ratio

The aspect ratio of the generated video.

Allowed values: 16:9, 9:16, 1:1, 4:3, 3:4, 21:9

Optional<string>resolution

The resolution of the video to generate.

Allowed values: 480p, 720p

Default: 720p

Optional<boolean>generate_audio

Whether to generate synchronized audio (voice, SFX, BGM) for the video.

Default: true

Response Schema

The submit endpoint returns an accepted generation task. Poll the result endpoint with the returned id for terminal outputs or errors.

Optional<string>error

Error message if the task failed. Empty on success.

stringidrequired

Unique identifier for the generation task.

Optional<string>model

Model ID used for the prediction.

Optional<array>outputs

Array of generated content. Empty when status is not completed.

stringstatusrequired

Status of the task: pending, running, completed, failed, or timeout.

Allowed values: pending, running, completed, failed, timeout

Model capabilities

array<string>capability_tagsrequired

Capabilities declared by the model registry.

Default: reference-to-video

stringexecution_moderequired

Execution mode declared by the model registry.

Default: async

# 1. Submit a generation request
curl -X POST https://api.sandbase.ai/v1/run \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "bytedance/seedance/2.5/reference-to-video",
  "prompt": "Use Image1 as the visual reference and Video1 as the motion reference. Create a peaceful cinematic shoreline scene with rolling ocean waves at golden hour, soft foam, natural water movement, and no people.",
  "duration": 5,
  "aspect_ratio": "16:9"
}'

# 2. If the response is still running, poll the returned id
curl https://api.sandbase.ai/v1/run/run_abc123 \
  -H "Authorization: Bearer $SANDBASE_API_KEY"

Response202 Accepted

{
  "id": "run_abc123",
  "model": "bytedance/seedance/2.5/reference-to-video",
  "status": "running",
  "outputs": []
}