Character AI Ovi Image To Video API Documentation

Character AI Ovi Image To Video API Documentation

Playground

Ovi is a Veo-3-like image-to-video model that generates synchronized video and audio from text or text+image prompts. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

Ovi is a veo-3 like, image-to-audio-video (I2AV) generation model that creates synchronized video and audio from a single image plus a descriptive text prompt.

It is designed for short-form storytelling, where a still image is brought to life with cinematic motion, dialogue, and sound.

🌟 Key Features

• 🎬 Image → Video+Audio – Bring a static image to life with synchronized audiovisual output.
• 📝 Prompt-driven – Use text prompts to control scene dynamics, style, and audio.
• 🗣️ Speech & Sound – Insert dialogue or sound effects using special tags.
• ⏱️ Short-form Output – Generates 5-second clips at 24 FPS.

💲 Pricing

Billing Rules

• Minimum charge: 5 seconds

🎨 How to Use

1. Upload Image

• Provide a reference image as the base frame.
• Make sure the URL is valid and accessible (a preview should appear).

2. Enter Prompt

• Describe scene motion, style, and atmosphere.

• Use tags for sound:

• <S>... <E> → Speech (converted into spoken audio)

• <AUDCAP>... <ENDAUDCAP> → Background audio / effects

3. Set Seed

• -1 = random output
• Any fixed number = reproducible results

4. Run

• Click Run $0.15 to generate your 5s image-to-audio-video clip.
• Preview and download the result.

📝 Prompt Example

A wide shot of a medieval knight standing in the rain, sword planted into the ground, glowing with mystical energy. 
<S>I will defend this land until my last breath.<E> 
<AUDCAP>Thunder rolls across the dark sky, distant war drums echo.<ENDAUDCAP>

🙏 Acknowledgements

• Wan2.2 – Video backbone initialization
• MMAudio – Audio encoder/decoder inspiration

⭐ Citation

If Ovi is useful, please ⭐ the repo and cite the paper:

@misc{low2025ovitwinbackbonecrossmodal,
 title={Ovi: Twin Backbone Cross-Modal Fusion for Audio-Video Generation}, 
 author={Chetwin Low and Weimin Wang and Calder Katyal},
 year={2025},
 eprint={2510.01284},
 archivePrefix={arXiv},
 primaryClass={cs.MM},
 url={https://arxiv.org/abs/2510.01284}, 
}

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",
  "image": "https://interactive-examples.mdn.mozilla.net/media/cc0-images/painted-hand-298-332.jpg",
  "seed": -1
}
JSON
)

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