LTX-2 19B API

Introduction

LTX-2 19B Image to video animates one photo into a clip with its own soundtrack. LTX-2 is Lightricks' open 19-billion-parameter audio-video model; this endpoint returns 5 to 20 seconds at 480p, 720p or 1080p in the photo's own shape, with stereo sound in the same MP4.

Choose a mode by starting material

Key features

Your photo, with sound

The soundtrack is generated with the motion, so a guitar photo comes back playing and a crowd photo comes back talking.

Keeps the shape

Portrait, square or widescreen photos come back in their own shape.

Request parameters

Pricing

Prices are in credits, the same credits you use on the website (1 credit = $0.01). The hold is taken when the task is accepted and settled to the actual charge when it finishes; failed tasks are refunded.

Each task is rounded up to whole credits, so one run at the lowest tier costs 11 credits for a 5-second clip ($0.11).

For an exact number before you run, send the same body to POST /jobs/quote.

Use cases

Musicians and performers

A still of someone with an instrument or a microphone becomes a performance.

Product and lifestyle shots

Add motion and ambience to a catalogue photo in one call.

Prompt guide & pro tips

Stay in the picture

Describe what happens next in the photo you sent; a prompt about another place can cut to a new shot.

Write the sound

An "Audio:" line with two or three sounds works better than none.

Draft at 480p

Find the motion at 480p and 5 seconds, then go up.

API quick start

Call the LTX-2 19B API in three steps

1. Create an API key. Sign in to PopNow and create a key in the API console. Keys start with sk-popnow- and use the same credits as the website.
2. Send the request. POST /jobs/createTask with model lightricks/ltx-2-19b/image-to-video and an input object that follows the parameter table. The response returns a task ID straight away.
3. Get the result. Poll GET /jobs/recordInfo with the task ID, or pass a callBackUrl and we post the result to it. Download the output links when the task succeeds.

# 1. Create the task. Keep the Idempotency-Key if you retry after a network error.
export IDEMPOTENCY_KEY="$(uuidgen)"
curl -X POST https://api.popnow.ai/api/v1/jobs/createTask \
  -H "Authorization: Bearer $POPNOW_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $IDEMPOTENCY_KEY" \
  -d '{
  "model": "lightricks/ltx-2-19b/image-to-video",
  "input": {
    "prompt": "A slow aerial shot drifting over a misty pine forest at sunrise",
    "image_url": "https://media.popnow.ai/influencer/examples/marco.webp",
    "resolution": "720p",
    "duration_seconds": 5
  }
}'

# 2. Copy data.taskId from the response, then poll until state is succeeded, failed, canceled or expired.
TASK_ID="TASK_ID_FROM_RESPONSE"
curl "https://api.popnow.ai/api/v1/jobs/recordInfo?taskId=$TASK_ID" \
  -H "Authorization: Bearer $POPNOW_API_KEY"

Replace the prompt and any links with your own. The API tab has the response, polling and callback reference.

LTX-2 19B API questions

All LTX models

LTX 2.5 reaches 2K and 4K for the same 20-second length; LTX-2 19B is the cheaper, open model with clip extension.

• LTX 2.5 APILong 20-second takes up to 4K with a soundtrackFrom 68 credits for a 5-second clip
• LTX-2.3 LoRA APILTX-2.3 clips with stereo sound and your own LoRAsFrom 18 credits for a 5-second clip
• LTX-2 19B API20-second clips with voices, music and effectsFrom 11 credits for a 5-second clip
• LTX-2 19B LoRA APILTX-2 clips with sound and your own LoRA stylesFrom 14 credits for a 5-second clip

Other video APIs

• MiniMax H3 APIExpressive clips with audio, up to 2KFrom 28 credits for a 5-second clip
• Seedance 2.5 APIByteDance's newest: 30-second clips with native audioFrom 56 credits for a 5-second clip
• Kling 3.0 API4K clips, multi-shot cuts and motion controlFrom 51 credits for a 5-second clip
• Vidu Q4 Preview APIUp to 4K clips with sound and spoken dialogueFrom 34 credits for a 5-second clip
• Wan 3.0 APIUp to 30-second clips with synced audioFrom 34 credits for a 5-second clip
• Kling O3 APIKling’s unified model: create, animate, reference and edit up to 4KFrom 51 credits for a 5-second clip

More about LTX-2 19B

Try it

LTX-2 19B AI Video Generator onlineCreate videos with LTX-2 19B in PopNow

Docs

LTX-2 19B model ID and input schema in the API docsPopNow API quickstart: your first request in five minutesImage to video guide for the PopNow APIWebhooks: get LTX-2 19B results without polling