Ltx 2.3 Video Extend

Ltx 2.3 Video Extend

Playground

LTX-2.3 is a DiT-based audio-video foundation model designed to generate synchronized video and audio within a single model, with improved audio and visual quality as well as enhanced prompt adherence. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.

Features

LTX-2.3 Video Extend seamlessly extends existing videos by generating additional frames that naturally continue your content. Upload a video clip and specify how many seconds to add — the model generates smooth, coherent footage that matches the original motion, style, and atmosphere.

Why Choose This?

• Seamless extension Generates new frames that naturally continue the motion and style of your original video.

• Flexible duration Extend videos by 1 to 20 seconds based on your needs.

• Prompt guidance Optional prompts to describe how the video should continue.

• LTX-2.3 quality Built on the improved LTX-2.3 architecture for better temporal consistency.

• Simple pricing Straightforward per-second billing at $0.10/second.

• Prompt Enhancer Built-in tool to automatically improve your continuation descriptions.

Parameters

How to Use

1. Upload your video — provide the source video you want to extend.
2. Set duration — choose how many seconds to extend (1–20 seconds).
3. Write your prompt (optional) — describe the motion, action, or scene changes.
4. Use Prompt Enhancer (optional) — click to refine your description.
5. Run — submit and download your extended video.

Pricing

Billing Rules

• Rate: $0.10 per second
• Duration range: 1–20 seconds

Best Use Cases

• Content Extension — Extend short clips into longer sequences for storytelling.
• Scene Continuation — Continue scenes beyond their original capture.
• Social Media — Transform brief moments into full-length videos.
• Film & Production — Extend establishing shots or B-roll footage.
• Loop Creation — Generate additional frames for seamless video loops.

Pro Tips

• Use detailed prompts describing how the motion, camera, and scene should continue.
• For best results, use source videos with clear motion direction that can be naturally continued.
• Start with shorter extensions to test results before generating longer clips.
• The model maintains temporal consistency with the original footage.

Notes

• Video is required; prompt is optional but recommended for better results.
• Duration range: 1–20 seconds.
• Ensure uploaded video URLs are publicly accessible.

Related Models

• LTX-2.3 Text-to-Video — Generate video from text with synchronized audio.
• LTX-2.3 Image-to-Video — Animate images with synchronized audio.

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",
  "duration": 5
}
JSON
)

# 1. Submit the prediction.
SUBMIT_RESPONSE=$(curl --silent --show-error --fail-with-body \
  -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/ltx-2.3/video-extend" \
  -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