(Summary made with help of AI as you must expect).

Original video: https://www.youtube.com/watch?v=S9O3FPumX4Q

MiniMax H3 (Hailuo 3) — Video Generation Model

The video introduces the open-weight release of the MiniMax H3 (Hailuo 3) video generation model. H3 is a 60-billion-parameter model capable of text-to-video, image-to-video, reference-to-video, in-place editing, and native audio generation.

Because it is open-weight, the community has already integrated it deeply into ComfyUI, allowing for complex, multi-modal video generation on local machines.

Prompting Techniques & Best Practices

The hosts and creators shared several key strategies for getting the best results out of H3:

• Keep It Straightforward: The model understands direct, straightforward language very well. You don't necessarily need overly complex "prompt engineering" jargon.
• Use an LLM as a "Prompt Enhancer": In the ComfyUI workflow, Comfy Rob uses an LLM node to take a basic concept and expand it into detailed, shot-by-shot prompts. This helps inject specific shots into the generated video seamlessly.
• Dialogue in Quotes for Lip-Sync: If you are using reference audio and want a character to speak, put the exact dialogue in quotation marks ("") within your text prompt. The model will automatically sync the character's lip movements to the referenced audio file.
• Context IR API (Intermediate Representation): If you are working with the API or advanced nodes, H3 has a feature that optimizes your prompt based on the multiple reference images you provide, helping the model figure out how to stitch different modalities together.

ComfyUI Workflow Techniques

Comfy Rob demonstrated a Reference-to-Video workflow, which you can find in the ComfyUI Template Library by searching for "Minimax." Here are the technical tips for setting up your nodes:

• Resolution / Megapixels Setting: Instead of traditional width/height settings, you often set the "Megapixels" node. Rob recommends starting at 0.4 megapixels, which outputs a resolution of roughly 864 × 480p.
• Controlling Shots and Timing: You can define the number of shots and the total length of the video. For example, if you want a 10-second video and set it to 5 shots, the model will generate a new shot every 2 seconds.
• Multi-Image Referencing: H3 allows up to 12 reference inputs. You can input multiple angles of a product (such as the earbuds example shown) to maintain strong temporal and spatial consistency across different generated shots.

Examples of What the Model Excels At

If you are looking for inspiration for your prompts, the video showcased three main areas where H3 currently excels:

1. Cinematic Product Advertisements

Rob used images of earbuds to create a sleek, professional 10-second commercial with changing camera angles, demonstrating the model's high consistency with product references.

2. Music Videos & Lip-Syncing

A video of a multi-eyed alien at a post office was shown where the alien's movements perfectly matched the rhythm of a song, and it sang the lyrics with highly accurate lip-syncing.

3. Complex Physics — Cloth & Fur

A video of a cat moving under a thick blanket demonstrated the model's impressive grasp of cloth physics, weight, and fur consistency without morphing or noticeable artifacts.

Hardware & Optimization Tips

Crucial for Local ComfyUI Users

H3 is a massive model, requiring approximately 120 GB of VRAM natively, so running it on consumer GPUs requires some optimization techniques:

• Use Kijai's LoRA: The community member Kijai released a 4-to-8-step LoRA. Adding this to your workflow can drastically speed up generation times on lower-end hardware.
• Use Quantized Models: Make sure you download quantized versions of the model, such as GGUF or FP8 versions, built for ComfyUI.
• Update ComfyUI: Ensure you are running the absolute latest version of ComfyUI. It uses fine-grained offloading specifically for H3, automatically moving parts of the calculation between your system RAM and your GPU's VRAM. This makes it possible to run the massive model on a standard 24 GB GPU, such as an RTX 3090 or RTX 4090.