LTX-2 ComfyUI: the swiss army knife for AI Video generation (text to video and image to video)

Introduction

This tutorial will guide you through creating simplified Text to Video (T2V) and Image to Video (I2V) workflows using ComfyUI with the LTX-2 model from Lightricks. The focus is on building foundational workflows that can be expanded into more complex techniques later. By the end of this tutorial, you will understand the core processes and be able to generate videos from text and images effectively.

Step 1: Understand the Workflow Structure

• Familiarize yourself with the complexity of LTX-2 templates in ComfyUI.
• Learn why building your own workflow can simplify the process and provide better control.
• Recognize that mastering these basics will enable easier transitions to advanced workflows.

Step 2: Install Required Models

• Download and install the necessary models for LTX-2:
  • LTX-2 19B Dev
  • Gemma 3 12B
  • LTX-2 Temporal Upscaler
  • LTX-2 19B Distilled LORA
  • LTX-2 19B Dolly-in Camera Control LORA

Step 3: Create the Text to Video Workflow

• Start from the default template in ComfyUI:
  • Navigate to the ComfyUI interface and select the T2V option.
• Implement the first stage using KSampler:
  • This provides a simpler workflow for your initial video generation.

Step 4: Upscaling and Sampling

• Develop the second step of your workflow:
  • Incorporate upscaling options to enhance video quality.
  • Adjust sampling settings to improve the output fidelity.

Step 5: Test the Workflow

• Run your initial version of the T2V workflow to evaluate its performance.
• Check for any issues with the output, such as quality or processing time.

Step 6: Fine-Tune Your Workflow

• Modify model sampling and LORA settings:
  • Experiment with different parameters to achieve the desired video quality.
• Use a new prompting strategy based on the LTX-2 Prompt Guide:
  • Adjust the prompts to refine the results further.

Step 7: Run Prototypes for Seed Selection

• Generate multiple prototypes to select the best seed:
  • This step allows you to compare different outputs and choose the most promising one.

Step 8: Execute the Full T2V Workflow

• Run the complete T2V process using your selected seed from the previous step.
• Monitor the output for quality and consistency.

Step 9: Transition to Image to Video

• Modify the existing T2V workflow to create an I2V process:
  • Replace text inputs with reference images for video generation.

Step 10: Prototype Selection and Upscaling for I2V

• Follow a similar approach as in the T2V process for selecting prototypes:
  • Ensure that you upscale and refine the images properly for optimal results.

Step 11: Review the Image to Video Results

• Analyze the final output from the I2V workflow:
  • Look for areas of improvement or adjustments for future projects.

Conclusion

By following these steps, you will have built foundational workflows for generating videos from text and images using ComfyUI and the LTX-2 model. This knowledge will serve as a stepping stone for more complex techniques, enabling you to explore advanced features like audio masking and editing in future projects. For further resources and support, consider checking out the provided links.