Video Relighter API Documentation

Video Relighter API Documentation

Playground

Video Relighter re-lights outdoor footage to a chosen lighting preset and sun direction, or re-renders the same shot at night, keeping composition, camera movement and subject motion intact. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

Change the lighting of a video without changing anything else. Video Relighter re-lights outdoor footage to a chosen sun direction, sun height and light quality, or re-renders the same shot at night, while keeping the composition, camera movement and subject motion intact frame for frame. Pick presets, no prompt writing needed.

Two Knobs

• lighting — one preset that sets sun height, shadow hardness and the look: hard_sunlight (default), noon_sun, low_sun, golden_hour, soft_daylight, warm_afternoon, cool_daylight, overcast, backlight, hazy_backlight. Night presets re-render the same shot at night: moonlight, starry, street_lights, city_glow, blue_hour.

• sun_direction — where the sun comes from, relative to the camera: front, front-right, right, back-right, behind, back-left, left, front-left. Ignored by night presets.

Parameters

Limits and Performance

• Max clip length per job: 2 minutes (longer input is truncated)
• Processing speed: roughly 10 seconds of wall time per second of video at 720p, about 25 seconds per second at 1080p
• Best on: outdoor scenes such as landscapes, streets, drone footage and people outside. Indoor footage is not supported for relight mode.

How to Use

1. Upload your video — drag-and-drop or paste a public URL.
2. Pick a lighting preset — a daylight look, or a night style.
3. Choose the sun direction — for daylight presets only.
4. Submit — run the job and download the relit result.

Pricing

> Billing duration: Input media duration is rounded up to whole seconds. The minimum billed duration is 3 seconds; shorter inputs are billed as 3 seconds. Input beyond 2 minutes is not processed and not billed.

Per-second billing with a 3-second minimum. The table below lists prices per 5 seconds for easy comparison.

Billing Rules

• Minimum charge: 3 seconds
• Per-second rate = (price per 5 seconds) ÷ 5
• Billed duration = video length in seconds (rounded up), with a 3-second minimum, capped at 120 seconds
• Total cost = billed duration × per-second rate (by output resolution)

Pro Tips

• The model relights the whole scene: sky, clouds and shadows are re-rendered to match the new sun. Expect a new sky when you move the sun.
• Pick a direction that differs clearly from the footage’s existing light for the strongest effect.
• backlight and hazy_backlight work best with sun_direction set to behind.
• Keep the same seed to get the same result again.

Notes

• Video is the only required field.
• Maximum processed video length per job: 2 minutes.
• Ensure 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'
{
  "video": "https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4",
  "lighting": "hard_sunlight",
  "sun_direction": "right",
  "target_resolution": "720p"
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/video-relighter" \
  -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 "${PREDICTION_ID}" ]; then
  printf 'Submission response did not contain a prediction id
' >&2
  exit 1
fi
RESULT_URL="https://api.wavespeed.ai/api/v3/predictions/${PREDICTION_ID}/result"

# 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|deleted) printf '%s\n' "${RESULT}" | jq . >&2; exit 1 ;;
    *) sleep 2 ;;
  esac
done

Parameters

Task Submission Parameters

Request Parameters

Response Parameters

Result Request Parameters

Result Response Parameters