Bytedance Seedance 2.0 Fast Video Edit

Bytedance Seedance 2.0 Fast Video Edit

Playground

Seedance 2.0 Fast (Video-Edit) edits an input video from a natural-language prompt at a faster, cheaper tier. Built on ByteDance Seed’s unified multimodal architecture, it preserves subject identity, composition, and motion while rewriting lighting, style, weather, environment, or specific elements as instructed. Ready-to-use REST API, best performance, no coldstarts, affordable pricing.

Features

Seedance 2.0 Fast Video-Edit is the faster, cheaper tier of Seedance 2.0 Video-Edit. It edits an input video from a natural-language prompt — change lighting, weather, style, environment, or specific elements while preserving subject identity, composition, and motion of the original.

Key Features

• Conversational video editing — Describe the change in plain language; the model rewrites the scene while keeping the original motion intact.
• Subject and motion preservation — Faces, objects, and camera movement from the input video stay consistent through the edit.
• Multi-reference support — Optionally guide style, character identity, or audio with reference images and audio clips.
• Native audio synchronization — Generates synchronized audio in a single pass.
• Faster, cheaper — ~19% cheaper than the standard Seedance 2.0 Video-Edit at every resolution.

Parameters

How to Use

1. Upload the input video. Anything longer than 15 s is trimmed to the first 15 s automatically.
2. Write the edit prompt. Describe the change you want — the prefix Edit the input video. is added for you.
3. (Optional) Add references. Reference images can constrain style or identity; reference audio can constrain the soundtrack.
4. (Optional) Set a duration. Auto-detected from the input video length if not provided.
5. Run. Receive the edited video with synchronized audio.

Pricing

Billed per second across input duration + output duration. Input duration is clamped to the 2-15 s range (sources shorter than 2 s are padded with the last frame).

Examples (input 5 s, output 5 s = 10 billed seconds):

Examples (input 12 s, output 12 s = 24 billed seconds):

Notes

• Inputs longer than 15 s are trimmed to 15 s and inputs shorter than 2 s are padded with the last frame to 2 s before editing — billing reflects the conformed length.
• Auto-detected duration matches the input length (rounded up), clamped to the 4-15 s range.
• Native audio generation is included.

Related Models

• Seedance 2.0 Video-Edit — Standard tier of this model.
• Seedance 2.0 Fast Image-to-Video — Fast image-to-video generation.
• Seedance 2.0 Fast Text-to-Video — Fast text-to-video generation.

Authentication

For authentication details, please refer to the Authentication Guide.

API Endpoints

Submit Task & Query Result

set -euo pipefail

export WAVESPEED_API_KEY="your-api-key"

REQUEST_BODY=$(cat <<'JSON'
{
  "prompt": "A cinematic ocean wave at sunrise, highly detailed",
  "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
  "aspect_ratio": "16:9",
  "resolution": "720p",
  "enable_web_search": false,
  "generate_audio": true
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/bytedance/seedance-2.0-fast/video-edit" \
  -H "Authorization: Bearer ${WAVESPEED_API_KEY}" \
  -H "Content-Type: application/json" \
  -d "${REQUEST_BODY}")

TASK=$(printf '%s' "${SUBMIT_RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
PREDICTION_ID=$(printf '%s' "${TASK}" | jq -r '.id // empty')
if [ -z "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL=$(printf '%s' "${TASK}" | jq -r '.urls.get // empty')
if [ -z "${RESULT_URL}" ]; then RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"; fi

# 2. Poll until the prediction finishes.
while true; do
  RESPONSE=$(curl --silent --show-error --fail-with-body \
    "${RESULT_URL}" \
    -H "Authorization: Bearer ${WAVESPEED_API_KEY}")
  RESULT=$(printf '%s' "${RESPONSE}" | jq 'if type == "object" and has("data") then .data else . end')
  STATUS=$(printf '%s' "${RESULT}" | jq -r '.status // empty')

  case "${STATUS}" in
    completed) printf '%s\n' "${RESULT}" | jq '.outputs'; break ;;
    failed|cancelled|timeout) printf '%s\n' "${RESULT}" | jq . >&2; exit 1 ;;
    created|processing) sleep 2 ;;
    *) printf 'Unexpected status: %s
' "${STATUS}" >&2; exit 1 ;;
  esac
done

Parameters

Task Submission Parameters

Request Parameters

Response Parameters

Result Request Parameters

Result Response Parameters