Scail 2

Scail 2

Playground

SCAIL-2 is a fast AI character animation and subject replacement model that preserves identity and motion from a single reference image and a driving video. It supports both Animation mode and Replacement mode at 480p or 720p. Ready-to-use REST inference API for character animation, motion transfer, subject replacement, social media clips, creative video editing, and professional image-to-video workflows with simple integration, no coldstarts, and affordable pricing.

Features

SCAIL-2 generates character animation from a single reference image and a driving video. Upload a character image, provide a driving video, choose a generation mode, and create an animated or replacement-style video result.

SCAIL-2 supports two modes:

• Animation Mode — animate the reference character using the driving video’s motion.
• Replacement Mode — replace the driving video’s subject with the reference character while preserving the original scene.

Key Features

• Image-to-video character animation Animate a reference character image using motion from an input driving video.

• Subject replacement Swap the subject in the driving video with the reference character while preserving the original scene structure.

• Two generation modes Use animate for motion-driven character animation or replace for subject replacement.

• Long-video support Supports input video duration up to 120 seconds for billing calculation.

• Audio passthrough The driving video’s audio track is preserved in the output.

Parameters

How to Use

1. Upload image — Provide a clear reference image of the character. JPG or PNG is recommended.
2. Upload video — Provide the driving video that contains the motion.
3. Add prompt (optional) — Describe the desired output, such as style, character details, or scene quality.
4. Choose mode — Select animate to animate the reference character, or replace to swap the video subject with the reference character.
5. Select resolution — Choose 480p for the default output or 720p for higher resolution.
6. Generate — Create the final video result.

Pricing

Billing Rules

• Minimum charge: 5 seconds. Any video shorter than 5 seconds is billed as 5 seconds.
• Maximum billed duration: 120 seconds.
• 720p costs 2x the 480p price.
• Billing is based on the input video duration after applying the 5-second minimum and 120-second maximum cap.

Best Use Cases

• Character animation — Animate a reference character using motion from a driving video.
• Dance and gesture transfer — Transfer body movement, gestures, and performance motion to a reference character.
• Subject replacement — Replace the main subject in a video with a reference character.
• Avatar content creation — Generate character videos for social media, entertainment, and creative projects.
• Video variation — Recreate the same motion with different character references.

Pro Tips

• Use a clear reference image with the character visible.
• JPG or PNG is recommended; avoid WEBP.
• Use a driving video with a clearly visible main subject.
• Keep the reference image’s camera angle close to the driving video’s framing when possible.
• Use animate when you want to drive the reference character with the video motion.
• Use replace when you want to swap the video subject with the reference character.
• Use 480p for testing and 720p for higher-resolution output.
• Add a prompt when you want more control over the style or visual details.

Notes

• image and video are required fields.
• prompt, mode, resolution, and seed are optional.
• Default mode is animate.
• Default resolution is 480p.
• Default seed is -1, which uses a random seed.
• Minimum billing duration is 5 seconds.
• Maximum billed duration is 120 seconds.
• Ensure uploaded image and video URLs are publicly accessible.

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'
{
  "image": "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg",
  "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
  "mode": "animate",
  "resolution": "480p",
  "seed": -1
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/scail-2" \
  -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