LTX 2.3 – Image/Text to Video – API Key Node Edition

Hello Community,

Several users asked for my workflow, so I decided to share it with everyone. Maybe it will be useful for some of you as well.

First Things First:

The workflow is based on the original workflow available in ComfyUI → Templates → Video → Image to Video. I don't want to take credit for work that isn't mine. The original workflow structure comes from the ComfyUI team.

What I Changed:

I integrated the LTX API Node and removed the need for the heavy Gemma Text Encoder as well as

the Text Positive and Text Negative nodes. Since prompts can be entered directly into the API node, these additional nodes were no longer necessary. I also cleaned up the subgraph a bit to make it easier to understand and navigate (at least for me).

Why I Made These Changes:

The main reason was speed. By using the API node, the text encoding runs through the LTX server and is completed in just a few seconds. On my system this reduced the preparation time by roughly 10 minutes compared to my previous setup. For me, saving 10 minutes per generation is a significant improvement.

Example Render Times:

Measured on my system (see hardware section below) using 5-second clips:

768 × 768 = 158.74 seconds

1080 × 608 = 160.05 seconds

1024 × 768 = 181.16 seconds

1248 × 720 = 192.00 seconds

1536 × 864 = 307.04 seconds

1920 × 1080 = 459.06 seconds

Your results may vary depending on hardware, settings, workflow configuration, and clip length.

The workflow is also capable of generating 20-second clips at the above resolutions on my system.

Hardware Used:

AMD Ryzen 7 5700X

64 GB DDR4 RAM

NVIDIA RTX 4060 Ti 16 GB

Image-to-Video and Text-to-Video:

In the main view there is a switch node in the center of the workflow. Simply change it between True and False to switch between Image-to-Video (I2V) and Text-to-Video (T2V). No separate workflows are required.

Important:

Don't forget to enter your API key inside the subgraph. You can get a free API key here:

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Then simply click "Get an API Key" (you have to sign up, but it's free).

The required models are already listed on the left side of the workflow.

Final Notes:

This is not a completely new workflow. It is simply a practical modification of the original ComfyUI

template that worked very well for me and significantly reduced my preparation time. Give it a try and let me know how it works on your system. Feedback, suggestions, and improvements are always welcome.