Low-VRAM character swap with MiniMax H3 in ComfyUI (no masking)

▶ Play demoYouTube · loads on click

What they did

A ComfyUI workflow that swaps a character in a video using MiniMax H3 plus a Character Swap LoRA, with no masking. It renders at about 0.4–0.5 MP in 8 steps and then upscales to 1.2 MP with the H3 latent upscaler. The creator tested it on an RTX 3060 6 GB with 16 GB RAM: about 20 minutes to generate and 21 to upscale. You build a character sheet first (Qwen Image 2.1, FLUX Krea or H3). Workflow and tutorial are linked from the post.

Worth knowing

• Price: unknown
• Status: sourced. We have not run this ourselves yet (no "Tested" badge).
• Quality bar (computed by code): 5/5 (primary source ✓, reproducible ✓, new ✓, example output ✓, safe ✓)

Related

tool▶ demo at source

Hailuo AI

MiniMax's consumer app for its Hailuo video models, with text- and image-to-video plus social-oriented tools.

Demo by MiniMax

Hailuo / MiniMax✓ vendor-checked

model▶ example at source

MiniMax video API docs

MiniMax's platform overview, where to find API access for its video, speech and language models.

Hailuo / MiniMax✓ vendor-checked

tool▶ demo at source

Replicate video collection

Replicate's curated collection of text-to-video models you can run by API, an alternative host to fal.

Demo by Replicate

ReplicateVeoHailuo / MiniMax✓ vendor-checked

tool▶ demo at source

ComfyUI

ComfyUI is the open, node-based app for building image and video pipelines on your own GPU or in the cloud. Most open-model video workflows assume it.

Demo by Comfy Org

ComfyUI✓ vendor-checked

tool▶ demo at source

ComfyUI docs: video

Official ComfyUI tutorial for Wan 2.1: text-to-video with the 1.3B model and image-to-video with the 14B model, including where each model file goes.

Demo by Comfy Org

ComfyUIWan✓ vendor-checked

tool▶ demo on X

ComfyUI Changelog

ComfyUI's release log. Check it to see when new video models get native nodes.

Demo by @ComfyUI

ComfyUI✓ vendor-checked