LTX 2.3 IC-LoRA Union Control — Replace Anyone in a Video (Full Tutorial)

Editor's Note: Hands-on YouTube walkthrough showing how to use the LTX 2.3 IC-LoRA Union Control workflow to replace a subject in a reference video. Watch the video for the live demo; refer to our IC-LoRA Complete Guide for the canonical specs and our setup guide for installation steps.

What this video covers

• Loading the IC-LoRA Union Control workflow in ComfyUI
• Preparing a reference video that drives motion and composition
• Setting up the IC-LoRA loader nodes and Reference Downscale Factor 0.5
• Writing a style-focused prompt so motion stays locked to the reference
• Common pitfalls when generating the first frame for I2V mode

Required model files

• ltx-2.3-22b-ic-lora-union-control-ref0.5.safetensors — IC-LoRA, place in models/loras/
• A dev model checkpoint (e.g. ltx-2.3-22b-dev_transformer_only_fp8_scaled.safetensors for 16 GB)
• ltx-2.3-22b-distilled-lora-384-1.1.safetensors (paired at strength 0.5)
• Gemma 3 12B text encoder (FP4 mixed for 16/24 GB)
• VAE: taeltx2_3.safetensors

All downloads are linked from our Models page.

Sources

• YouTube: LTX 2.3 IC LoRA Union Control — Full Tutorial: Replace Anyone in a Video
• Official IC-LoRA Union Control on HuggingFace