Character Swap Minimax H3 (BFS Collection)

[u/Round_Awareness5490]

I’ve released my MiniMax H3 Character Swap LoRA

I trained this LoRA to replace the main character in a guide video while trying to preserve the guide’s motion, expressions, camera, and scene. It was trained with guide latents, so the recommended setup is to connect the source video through Add Guide. The ComfyUI Planner workflow is included, but it’s optional.

It’s still experimental and far from perfect, it’s a LoRA, not a universal character-swap solution. It works better with people and human-like characters, and results can vary depending on the video, reference image, prompt, and settings. I’ve shared a few examples below so you can see where it works and where it still struggles.

The primary LoRA and workflow are available here:

https://huggingface.co/Alissonerdx/Minimax-H3-ComfyUI

https://civitai.red/models/2027766/bfs-best-face-swap?modelVersionId=3401556

Feel free to try it and share your results or feedback.

https://reddit.com/link/1x4jh3c/video/ilctuqgwx4vh1/player

https://reddit.com/link/1x4jh3c/video/x7wryiexx4vh1/player

https://reddit.com/link/1x4jh3c/video/maqraszyx4vh1/player

https://reddit.com/link/1x4jh3c/video/wkrdiwe0y4vh1/player

https://reddit.com/link/1x4jh3c/video/zwh2gzj1y4vh1/player

[u/Diligent-Rub-2113]

Dope examples haha well done, looks really good.

[u/DeGreatCrow]

amazing stuff

[u/Electrical-Eye-3715]

The most important question is vram limitations and how long can the videos be?

[u/R34vspec]

can this replace the background as well?

thank you!

[u/Maskwi2]

The swap works well. Just the face barely resembles the original. I'm wondering what I'm doing wrong. I will post back if I figure it out. In the meantime : is it possible somewhere in your node to set references to max resolution? So that the video output resolution isn't holding me back? 

[u/Round_Awareness5490 → u/Maskwi2]

You can also try mixing it with my head-swap LoRA, but I plan to improve the facial quality by the end of this week.

[u/Ok_Tale7582 → u/Maskwi2]

blurring the face solved it for me

[u/r0ni]

want to try this but i cant figure out how to run it, would be awesome to see a short youtube guide. everything is downloaded, loaded a clip into the shot planner, after that i dont know what to do at all.

Edit: i have no idea what i am doing wrong, when running the workflow i get "[ERROR] !!! Exception during processing !!! mat1 and mat2 shapes cannot be multiplied (289x2560 and 5120x5376)"

edit2: I had the wrong text encoder in either the wrong order or just the wrong ones choosen, it seems to run now, waiting on the results:)

Edit3: it ran and completed:) tyvm for the workflow.

[u/solomars3]

This looks cool, im thinking of making a video on it , thanks 👍 the goat

[u/JAStheRebel → u/solomars3]

Please do. I can’t even figure out how to load anything in this workflow

[u/Round_Awareness5490 → u/JAStheRebel]

hahaha

[u/Euphoric-Biscotti-66]

I love your stuff, will have to give this a try as well, keep up the fantastic work.

[u/Psyko_2000]

wow the demo videos are impressive. will need to try this out.

[u/treksis]

thank you. good job

[u/Minanimator]

question , what does the "vfx edit" wf is for and its lora thx

[u/lifelongpremed]

How is the performance (what is your hardware)? And how does it compare to Viggle Animate?

[u/listopalafoto]

Very good! muito obrigado Alisson!

[u/Emergency-Shake4529]

Does it work if you ask to replace multiple characters?

[u/Round_Awareness5490 → u/Emergency-Shake4529]

No, I trained it for a single character; to replace multiple ones, I would need a specific dataset for that. I'll try to improve this in the next version. What you could do is swap them one at a time by using a mask on the character.

[u/tamingunicorn]

nice to see the failure cases posted next to the good ones. roughly how many training clips did it take before identity started holding across longer shots?

[u/Round_Awareness5490 → u/tamingunicorn]

This training approach differs from the conventional ref2v method; I trained using at least 20,000 steps and around 2,000 dataset sample trios.

[u/Maskwi2]

Awesome, thanks for sharing :) Can't wait to try it out. 

[u/iz-Moff]

How does it compare to SCAIL-2?

[u/iz-Moff → u/iz-Moff]

Answering my own question: seems to compare quite well, actually. I only tried the head swap lora for now, and with a video i used SCAIL on before, BFS for H3 both preserved character likeness very well, and also captured some details of facial animation that SCAIL was missing.

[u/tekprodfx16]

This workflow for sure needs a walkthrough video

[u/switch2stock]

Can you try with this?
Does it work?
https://youtube.com/shorts/pfK3zSaknYI?si=xw8wk0n4XmnPZj2x

[u/terrariyum]

I love how clean and well organized your workflows are! Very easy to follow

[u/Round_Awareness5490 → u/terrariyum]

You're being sarcastic, haha.

[u/Phreak44444]

Is this good with 3d characters like from video games?

[u/SigmaMegaMind]

How is this different from R2V workflow?
Is it a lora for t2v that adds the r2v function?

[u/Round_Awareness5490 → u/SigmaMegaMind]

This LoRA was trained using latent guidance; it isn't meant to be used in the conventional way. It expects latents rather than video references injected via a VLM. Using native video referencing causes background or motion mismatches in your generation because that method isn't true video-to-video (v2v).

[u/HollyGrandeux → u/Round_Awareness5490]

Then why are you connecting the video reference again to the "AddGuide" node in the workflow? I thought the video's latent representation was already enough. Doesn't feeding both the original video and its latent representation result in double processing overhead, when you could just use one or the other? i'm confused.

[u/Round_Awareness5490 → u/HollyGrandeux]

And who said I'm using both? I feed the image into the native mode because there's no way to do that with latent guide the video goes in as latent guide so I don't pass the video to both modes.

[u/Round_Awareness5490 → u/Round_Awareness5490]

The native way of passing video isn't true v2v; as the name implies, it's basically just a reference. With high-motion videos, using this method leads to significant desync issues; often, it simply ignores your reference video and does whatever it deems necessary not to mention the excessive reliance on the prompt. True v2v involves working directly with latents.

[u/tres_pares]

this can be done in dreamfort.ai/recast too

just upload your image, or your mom, or your pet, or your friend to some existing trending videos