videostringrequired
The URL of the video to extend
LTX 2.3 Pro Video Extend
lightricks/ltx-2.3-pro/video-extendLtx 2.3 Pro Extend by Lightricks - AI-powered video editing and transformation. Apply style transfer, motion control, lip-sync, and visual effects to existing videos with natural language instructions.
Try the model
Playground
Input
Description of what should happen in the extended portion of the video.
The URL of the video to extend
Additional Settings More
Customize your input with more control.
220
Duration in seconds to extend the video. Maximum 20 seconds. Range: 2 to 20.
ResultExample
What would you like to do next?
Examples
Select an example to load its inputs and result into the playground.
- Open result ↗
Input
{ "prompt": "Continue the motion smoothly", "video": "https://static.sandbase.ai/examples/dbd7d6a6-b2a4-4fcb-a88c-ab762951fb12/input/d3e86131-4af5-4826-9dc1-4dcbdef35e3b.mp4" }
LTX 2.3 Pro Video Extend
LTX 2.3 Pro extend: continue a clip with 2–20 seconds of new footage.
Fields
| Field | Type | Default | Notes |
|---|---|---|---|
prompt | string, required | — | Up to 5,000 characters. |
video | video URL, required | — | Clip to continue. |
duration | integer 2–20 | 5 | Seconds of new footage. |
Billing
$0.10 per new second.
| Output | Price |
|---|---|
| 2s | $0.20 |
| 5s (default) | $0.50 |
| 10s | $1.00 |
| 20s | $2.00 |
Failed runs are not charged.
Prompting
- Describe what happens next.
Also on SandBase
Other LTX 2.3 endpoints: lightricks/ltx-2.3-pro/text-to-video, lightricks/ltx-2.3-pro/image-to-video, lightricks/ltx-2.3-pro/audio-to-video, lightricks/ltx-2.3-pro/retake.
Start building
Send your first request
Submit this model through the SandBase Unified Run API.
# The quoted heredoc keeps Unicode and shell metacharacters unchanged.
result=$(curl --fail-with-body --silent \
-X POST "https://api.sandbase.ai/v1/run" \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
-H "Content-Type: application/json" \
--data-binary @- <<'SANDBASE_JSON'
{
"model": "lightricks/ltx-2.3-pro/video-extend",
"video": "https://static.sandbase.ai/examples/lightricks/ltx-2.3-pro/extend/input_video_0.mp4",
"prompt": "Continue the motion smoothly",
"duration": 5
}
SANDBASE_JSON
)
run_id=$(printf '%s' "$result" | jq -r .id)
for attempt in $(seq 1 120); do
status=$(printf '%s' "$result" | jq -r .status)
case "$status" in completed|failed|timeout) break ;; esac
sleep 2
result=$(curl --fail-with-body --silent \
-H "Authorization: Bearer $SANDBASE_API_KEY" \
"https://api.sandbase.ai/v1/run/$run_id")
done
status=$(printf '%s' "$result" | jq -r .status)
[ "$status" = completed ] || { echo "Generation ended: $status" >&2; exit 1; }
printf '%s\n' "$result"2. Authentication
Create a SandBase API key and set it in your server environment. All requests use Bearer authentication.
export SANDBASE_API_KEY="YOUR_API_KEY"Keep the key on your server. Do not expose it in browser code or commit it to a repository.
3. Queue
Submit a request
POST to /v1/run with this model ID and its inputs. The request example above includes submission and polling.
Fetch request status and result
Use the returned run ID to poll until the status is completed, failed or timeout. Read output only after completed.
curl "https://api.sandbase.ai/v1/run/$RUN_ID" \
-H "Authorization: Bearer $SANDBASE_API_KEY"4. Files
Hosted files
Pass a publicly accessible file URL in the model’s image, video or audio field. Supported formats and limits are shown beside each Playground input.
Uploading images
Use the upload or replace control on supported image fields in the Playground. Video URL fields accept a hosted driving video; they do not imply video-upload support.
5. Schema
Input
promptstringrequired
Description of what should happen in the extended portion of the video.
durationinteger
Duration in seconds to extend the video. Maximum 20 seconds.
Default: 5
Minimum: 2
Maximum: 20
{
"model": "lightricks/ltx-2.3-pro/video-extend",
"video": "https://static.sandbase.ai/examples/lightricks/ltx-2.3-pro/extend/input_video_0.mp4",
"prompt": "Continue the motion smoothly",
"duration": 5
}Output
A completed run exposes its result in output. The following is the model’s saved example, not a new generation.
[
{
"poster": "https://static.sandbase.ai/examples/posters/d2c9881db0ed174558fb.jpg",
"source": "Lightricks/LTX schema mirror",
"source_url": "https://ltx.studio/",
"url": "https://static.sandbase.ai/examples/dbd7d6a6-b2a4-4fcb-a88c-ab762951fb12/output/c54c8a8a-d4a7-41b6-a15c-c19986b12493.mp4"
}
]