LTX 2 Pro: Text-to-Video 4K, Audio Sync, Pro Control | RunComfy

Model overview

Provider

Lightricks

Task

High-fidelity text-to-video generation with image conditioning

Architecture

Advanced Diffusion Transformer (DiT) optimized for temporal consistency and photorealism

Resolution

Supports high-definition outputs up to 2160p (4K)

Key strengths

• Cinematic Quality: Produces broadcast-ready video with realistic lighting and motion.
• Audio Integration: Native capabilities to generate synchronized audio alongside video.
• High Frame Rates: Supports smooth motion up to 50 FPS.
• Precise Control: Utilizes both text prompts and input images for granular control over the generated scene.

LTX 2 represents the next evolution in generative video technology. It excels at understanding complex prompt instructions and maintaining subject consistency across frames. The "Pro" variant on RunComfy is tuned for maximum quality and detail, making it ideal for final production assets.

Capabilities and Variants

RunComfy hosts the full suite of LTX 2 capabilities. While this page features the Pro Text-to-Video workflow, you can explore other specialized modes:

• For animating static images into video, use LTX 2 Pro Image-to-Video.
• For faster iteration and lower latency, try LTX 2 Fast Text-to-Video or LTX 2 Fast Image-to-Video.
• To refine and edit existing clips, use LTX 2 Retake Video.

How LTX 2 runs on RunComfy

On RunComfy, LTX 2 is hosted as a managed ComfyUI graph and exposed in three complementary ways:

Playground UI

Input your text prompt, upload a reference image, adjust resolution and FPS, and generate videos directly in your browser.

Ideal for verifying prompts and testing different aesthetic styles before scaling up.

Workflow API

From the playground or workflow view, you can deploy the model as an API and call it from your own apps or services.

This provides a private, production-ready endpoint matching the exact configuration of the Pro model.

In all cases, inference runs on RunComfy’s high-performance cloud GPUs—no local hardware, drivers, or downloads needed.

Input parameters

The LTX 2 Pro interface accepts specific parameters to control the video generation process.

Core Inputs

The image_url is a required string parameter (accepting formats like JPG, PNG, or WEBP) that serves as the initial image to condition the video generation, acting as the starting frame or style reference. The prompt is also a required string parameter used to provide a narrative description of the video content, movement, and atmosphere. Additionally, the generate_audio boolean parameter (true or false) determines whether to automatically generate sound effects and ambience matching the video content.

Video Settings

The resolution string parameter defines the output quality with options for 1080p, 1440p, or 2160p; higher resolutions take longer but provide clearer details. The duration integer sets the length of the video in seconds, with typical values of 6, 8, or 10. You can control the frame rate via the fps integer, choosing 25 for a cinematic look or 50 for smoother motion. Finally, the aspect_ratio string determines the dimensions of the generated video, which is currently optimized for widescreen 16:9.

Recommended settings

Cinematic Scenes

For movie-like results, use 25 FPS, 1080p or 1440p, and enable generate_audio. Ensure your prompt describes camera movement (e.g., "slow dolly in", "pan right") to guide the motion effectively.

High-Motion Action

For sports or fast-paced scenes, increase to 50 FPS to reduce motion blur. Use a shorter duration (6s) to maintain coherence during rapid movement.

High-Fidelity Production

Select 2160p (4K) resolution. Note that generation time will increase, but the output will be suitable for large-screen viewing.

Output quality and performance

LTX 2 Pro is optimized for quality over raw speed.

On RunComfy, expect:

• Resolution: Crystal clear outputs up to 4K.
• Coherence: Excellent temporal stability with minimal flickering or morphing artifacts.
• Audio: Surprisingly accurate soundscapes that align with visual cues (e.g., city noise, footsteps).

Recommended use cases

LTX 2 Pro excels where visual fidelity is paramount:

Marketing & Advertising

Create high-resolution B-roll, product reveals, and social media ads that require a polished, professional look.

Content Creation

Generate background scenes, visualizers for music, or narrative clips for YouTube and short-form content.

Pre-visualization

Filmmakers can use the Pro model to storyboard complex scenes with high accuracy before shooting.

How LTX 2 Pro compares to other models

LTX 2 Pro vs LTX 2 Fast

• Pro: Focuses on maximum resolution (up to 4K), higher step counts, and detail retention. Best for final exports.
• Fast: Optimized for speed and lower latency. Best for rapid prototyping or real-time applications. Check out the Fast variant here.

LTX 2 vs Competitors

Compared to older diffusion video models, LTX 2 offers superior prompt adherence and native audio generation, reducing the need for external sound effect tools.

Official resources and ecosystem

Official LTX Video Code

https://github.com/Lightricks/LTX-Video

Hugging Face Model Card

https://huggingface.co/Lightricks/LTX-Video

License and commercial usage

LTX 2 (LTX Video) is generally available under the OpenRAIL-++ license (or specific terms set by Lightricks). Users are responsible for ensuring their generated content complies with the license terms, particularly regarding commercial applications.

Disclaimer: This summary is for informational purposes. Please consult the official Lightricks documentation for the most up-to-date licensing information.