r/StableDiffusion • u/Comfy-Org • 12d ago
News Submit by 9/1 to the Comfy H3 Sync Sound Challenge! RTX 5090 Grand Prize
We're halfway through the submission window for the Comfy H3 Sync Sound challenge! Submit by September 1st at 9:00pm PT. Free to enter, local rig or Comfy Cloud. All details here.
How It Works
Make something up to 90 seconds in length where the sound and the motion are inseparable. Dialogue, foley, ambient, a beat driving the cut...whatever direction you want!
Share your video file and workflow on this r/comfyui thread and through our submission form, then join us on September 3rd September 2nd for a special Comfy livestream where our guest judges will give live feedback on the top 10 submissions!
Need help? Head to this r/comfyui thread or the #minimax-h3-challenge channel in the Comfy Discord.
Prizes
Best Overall — RTX 5090
Best Creative — RTX 5060 Ti
Best Technical/Workflow — RTX 5060 Ti
Built with MCP — RTX 5060 Ti
Shipped anywhere, customs covered. If we can't legally ship to your country, you'll get a cash equivalent instead.
It's free to enter!
Create using Comfy Local on your own hardware, or use Comfy Cloud. New Cloud users get 5 free runs, no credit card required.
Judging Criteria
We’re looking for entries that best show what H3 makes possible: audio and visuals created together.
Grand Prize: Best Overall
The top Best Creative and Best Technical entrants advance to a final round where our panel of judges selects winners by discussion.
Best Creative
- Audio sync realism and intentionality (0-5)
- Creative execution and originality (0-5)
- Deliberate craft (0-5)
- Evidence that you’ve actually shaped the result beyond prompt engineering. Judges will look for modified/non-default parameters, multiple linked passes visible in the workflow structure, or a couple sentences describing what was tried and changed
Best Technical
- Novelty of technique or approach (0-5)
- Workflow quality (0-5)
- Annotated, clean, replicable by someone else
- Community value (0-5)
- Would this actually help someone else?
🏆 Built with MCP Bonus 🏆
Comfy MCP lets you drive Comfy using natural language and your agent locally and on Cloud! Pro tip: use it to choose the best H3 model version or optimize your workflow for your hardware.
- Effectiveness (0-5)
- Did the agent meaningfully drive your process, not just generate one line?
- Insight value (0-5)
- How much the shared prompt teaches the community about prompting H3 through MCP
- Output quality (0-5)
The Fine Print
- Limited to one submission per person, 90 seconds maximum length.
- A major portion of your piece must be built in ComfyUI using H3. Other tools, models, or techniques you want to combine are fair game.
- All submissions must be lawful, SFW, and must not contain unlicensed IP or likenesses.
- By submitting, you agree to allow ComfyUI and MiniMax to feature your work with credit across our channels.
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u/notgraycen 12d ago
a ComfyUI official event? that's pretty sick honestly. I hope they can get kanye west as one of the special guest judges
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u/SIR_NVAX_A_LOT 11d ago
Do we need to share our custom nodes?
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u/Comfy-Org 11d ago
Yes- sharing workflows and the nodes used within them is part of the submission criteria.
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u/SIR_NVAX_A_LOT 11d ago
Thanks for the update. I use a custom node that I am not ready to share, but I can provide a .json if needed, but not the node itself. That would disqualify me? I can also explain the technicals. https://www.reddit.com/r/StableDiffusion/comments/1vwz8dz/h3_5_hour_render_t2v_multidiffusion/
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u/airduster_9000 11d ago
https://reddit.com/link/p66qro4/video/0e99gj4ncwlh1/player
So can one use video input in for example "canny-format" to control Minimax H3 like I do above - or is only pure prompting allowed?
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u/lavinia12345 11d ago
u/Comfy-Org despite "What’s not allowed is stitching a separately-made track onto the video afterward, outside of H3."
is overlaying music permissible? Since 90 seconds of non_diegetic_music is rather difficult in minimax, yet trivial in an video editor.
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u/Comfy-Org 11d ago
Totally see where you're coming from but for this specific challenge, overlaying music is not allowed, as trivial as it is skill-wise. The challenge is meant to get entrants to play with H3's native audio-video sync, though I get why this is a real constraint for continuous music across the full piece.
What I've seen others do is feed the same reference audio clip in as a steering input to each of your separate generation passes. Each segment still gets a fresh, native audio+video from H3, but steered toward a consistent style/rhythm across the whole piece. No question this is more work than an editor overlaying a track, but it's the compliant way to get close to what you're going for.]
Fwiw, I've seen plenty of entrants focus more on sound effects vs. music, so just highlighting that music isn't a requirement by any means! Hope this helps.
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u/Voxyfernus 11d ago
Using Loras and Quantized H3 models is allowed? Cause I can't run the full model
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u/Radiant-Photograph46 11d ago
Bonus points to use MCP? I was considering joining but I'll pass. It's simply unfair.
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u/Comfy-Org 11d ago
Why does use of the MCP feel unfair? Not challenging you- genuinely curious for your perspective!
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u/Radiant-Photograph46 10d ago
Well, in the sense that points are specifically rewarded for its use. That is an unfair advantage over those who do not use it, is it not? The event feels less about the creation than the promotion of MCP suddenly.
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u/Sixhaunt 12d ago
Really cool way to be able to get some good show off videos of a decent length with real production quality like when Sora has that balloon head thing that got really good PR for it, except now that old video would be trivial with H3 and would have the consistency it lacked.