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Ltx-2 Video Models
ltx-2.3-quality/extend-video
Ltx 2.3 Quality Extend Video
video-ke-video

Ltx 2.3 Quality Extend Video API

ltx-2.3-quality/extend-video
Extend-video

Generate high-quality video with audio from images using LTX-2.3

LTX 2.3 Quality Extend Video

LTX 2.3 Quality Extend Video seamlessly extends an existing video forward or backward, generating new frames that match the source video's style, lighting, and motion dynamics. Only the generated extension is billed — source frames are never charged.

🌟 Key Features

⏩ Bidirectional Extension

Extend a video forward to continue the scene, or backward to generate a natural-looking prequel — all from the same model.

🎨 Style-Consistent Generation

The model analyzes the source video's visual style, color grading, and motion patterns, producing extensions that blend seamlessly with the original.

🎞 Frame Rate Matching

Optionally match the source video's frame rate for a perfectly smooth, artifact-free result.

🔊 Optional Audio Generation

Optionally generate audio for the extended segment.

🔁 Reproducible Results

Pin a seed value to reproduce or iterate on a specific generation.

⚙️ Parameters

ParameterRequiredDescription
promptText description of the extended scene. Maximum 2,000 characters.
video_urlURL of the input video to extend. Supported: mp4, mov, webm, m4v, gif.
extend_directionDirection of extension: forward (default) or backward.
num_framesNumber of frames to generate for the extension (default: 81).
resolutionOutput video resolution preset (default: landscape_16_9). See options below.
match_input_fpsWhether to match the source video's frame rate (default: true).
generate_audioWhether to generate accompanying audio (default: false).
seedRandom seed for reproducibility. Omit for random results.

Resolution Options

ValueDescription
square_hdSquare HD (1024×1024)
squareSquare (512×512)
portrait_3_4Portrait 3:4
portrait_9_16Portrait 9:16
landscape_4_3Landscape 4:3
landscape_16_9Landscape 16:9

Extend Direction Options

ValueDescription
forwardAppend new frames after the end of the source video
backwardPrepend new frames before the start of the source video

💲 Pricing

Billed at $0.0024075 per megapixel of generated video data (width × height × num_frames), rounded upward. Source video frames are not billed.

Example: landscape_16_9 (1280×720) at 81 frames ≈ 75 MP ≈ $0.18

💡 Prompt Tips

Continue the scene naturally — the character keeps walking down the moonlit street, footsteps echoing, same cinematic lighting.

  • For forward: describe what happens next — new actions, camera movements, scene transitions.
  • For backward: describe the preceding context — where the scene came from, setup shots.
  • Keep the style description consistent with the source video to avoid jarring transitions.
  • Reference the source video's existing elements (characters, lighting, environment) to anchor the generation.

🎯 Use Cases

  • Film & Short Video — Extend short clips into longer sequences without re-shooting.
  • Loop Creation — Generate seamless extensions to create looping background videos.
  • Scene Padding — Add establishing or trailing shots to existing footage.
  • Creative Exploration — Explore alternate continuations of a scene with different prompts.

📝 Notes

  • Both prompt and video_url are required.
  • num_frames must satisfy: (num_frames - 1) % 8 == 0 (e.g. 25, 33, 41, 81, 121).
  • Only the generated extension segment is billed; source video frames are never charged.
  • Task status values: created, processing, completed, failed.
  • Generated video URLs are returned in outputs once status is completed.

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