# LTX Extend Canonical page: https://fuser.studio/models/ltx-extend LTX Extend in Fuser continues a video clip forward or backward from a text prompt at up to 720p. Lengthen generated shots without re-rendering them. ## Specs | Spec | Value | | --- | --- | | Inputs | Prompt (text), Negative Prompt (text), Video Prompt (video) | | Output | video | | Resolution | 480p, 720p | | Aspect ratios | 16:9, 9:16 | | Cost | 55 credits per run | Lengthen existing video clips with continuous camera momentum, organic physics, and seamless temporal coherence Creator: Lightricks Also known as: LTX-Video [Extend footage now](https://app.fuser.studio) ## How LTX Extend works Three simple stages turn truncated footage into seamless, extended video sequences with natural physical momentum. ### Upload source footage Provide a clean video clip and specify the starting frame index to anchor temporal conditioning. ### Direct subsequent action Prompt the model with forward camera movement, directional pans, or continuing physical motions. ### Synthesize extended frames Generate a smooth 720p extension maintaining visual identity, lighting, and natural momentum. ## What LTX Extend is good at Built on a specialized Diffusion Transformer and multi-keyframe latent conditioning, LTX Extend keeps camera motion and scene physics strictly coherent. ### Latent-Conditioned Sequence Extension Anchors source frames in latent space to synthesize forward frames autoregressively without abrupt visual cuts or scene breaks. ### Organic Weight and Fabric Dynamics Simulates realistic physical momentum across heavy garments, liquid ripples, and hair movement with natural velocity and weight. ### Cinematic Dolly and Pan Momentum Preserves existing camera trajectory and focal depth, continuing slow pans and tracking shots across architectural environments. ### Flexible Keyframe Insertion Configure start frame values from 0 to 120 and scale inference up to 50 steps to govern temporal anchoring and output texture fidelity. ## Made with LTX Extend Explore how LTX Extend lengthens cinematic dolly shots, editorial garment motion, automotive tracking passes, and atmospheric archival scenes. ### Editorial beauty still with overhead camera crane ### Low-angle dynamic tracking shot of automotive motion ### Atmospheric music video frame with slow dolly movement ### Architectural product study showcasing textural momentum ### Documentary scene extension with horizontal panning ## What people build with LTX Extend From cinematic b-roll to runway lookbooks and vertical reels, creators use LTX Extend to preserve temporal continuity across video projects. ### Short-Form Video Continuity Lengthen truncated AI-generated clips into complete 9:16 vertical video sequences without losing character identity or lighting consistency. ### Cinematic Film Shot Extension Extend cut-off establishing shots, character reactions, or environmental b-roll into full-length cinematic sequences with natural momentum. ### Fashion Lookbook Motion Transform brief runway or studio clips into flowing editorial sequences highlighting the drape, texture, and movement of garments. ### Automotive Commercial Sequences Synthesize extended camera tracking shots and exterior motion passes for product commercials while preserving vehicle geometry. ### Architectural Walkthroughs Lengthen interior and exterior spatial fly-throughs with steady camera dollies, maintaining lighting setups and textural fidelity. ## Frequently Asked Questions ### What is LTX Extend and how does it work? LTX Extend is a video extension tool powered by Lightricks' open-source LTX-Video Diffusion Transformer (DiT) architecture. It uses multi-keyframe latent conditioning to anchor an input video clip at a designated frame index, autoregressively generating new frames that continue the scene's motion, lighting, and camera trajectory. ### What type of video extensions does the model handle best? LTX Extend excels at slow, organic physical movements, camera dollies and pans, and continuing single-shot scene action. It is particularly effective for lengthening short AI-generated clips, rendering realistic momentum for flowing fabrics, hair, and environmental physics while keeping lighting setups and character identity stable across frames. ### How do I configure the start frame parameter? Set the start frame to match the frame index where you want generation to anchor—typically the final frame of your input clip for a forward extension. For example, use 24 for a 1-second 24 FPS clip, or up to 120 for longer footage. Setting the start frame to 0 anchors conditioning at the beginning of the timeline for reverse or start-of-scene extensions. ### What are the model's limitations and when should I avoid it? Avoid using LTX Extend for scenes requiring legible typography, intricate hand or finger interactions, or rapid kinetic action. The model is designed strictly for single-shot continuous motion and cannot execute cinematic camera cuts, scene transitions, or complex multi-subject choreographies within a single generation. ### What resolutions and aspect ratios are supported? LTX Extend supports output resolutions of 480p and 720p across both 16:9 widescreen and 9:16 vertical aspect ratios. For production fidelity, 720p paired with 40 to 50 inference steps provides the crispest textures, while 480p and lower step counts offer rapid iteration for motion prototyping. ## Try LTX Extend on Fuser Lengthen existing video clips with continuous camera momentum, organic physics, and seamless temporal coherence [Extend footage now](https://app.fuser.studio) ## Related models - [LTX 2.5](https://fuser.studio/models/ltx-2-5.md) - [LTX](https://fuser.studio/models/ltx.md) - [Kling 4.0](https://fuser.studio/models/kling-4-0.md) - [MiniMax H3 Reframe](https://fuser.studio/models/minimax-h3-reframe.md) - [Gemini Image](https://fuser.studio/models/gemini-image.md) - [GPT Image](https://fuser.studio/models/gpt-image.md) ## More articles - [LTX-2.5 Guide: Fast vs Pro, Prompts, Audio and Retake](https://fuser.studio/articles/ltx-2-5-guide.md) - [How to Make AI Videos Longer: Extend, Chain and Multi-Shot](https://fuser.studio/articles/extend-ai-video-length.md)