MiniMax-H3 多模态视频生成

So you searched MiniMax H3 in ComfyUI and landed here. Fair warning before you get excited: this node does not run H3 on your GPU. MiniMax H3 is the omni model from August 2026 that puts image, video and native audio in one context window - the one that made people talk about "multi-modal" video like it finally means something. But Minimax_H3_V2_Video is a wrapper around the hosted MiniMax-H3, reached through the seedance.nz gateway this pack is built around. You need an API key and every clip is a paid call. Same deal as the Seedance and Hailuo nodes in this pack, and the same reason the r/comfyui crowd tends to grumble about "API nodes" - it's the price you pay for a model you were never allowed to download locally. If you'd rather run H3's open weights yourself, this isn't the node for that, and the H3 Community License excludes a lot of regions anyway. This is the "I just want the clip" route.

What it actually does

It's a text-to-video, image-to-video, and reference-video node all at once, with one genuinely unusual party trick: audio-driven generation. Connect a drive_audio clip and the model can lip-sync and animate characters to it - that's why duration is allowed to stretch to 60 seconds only when drive_audio is connected (otherwise it's capped at 15). Under the hood it speaks MiniMax's V2 protocol directly: it uploads your images, videos and audio to the gateway, POSTs to /v2/video_generation with a content array of typed items (text, image_url, video_url, audio_url with roles like first_frame, reference_image, drive_audio), polls GET /v2/query/video_generation/{task_id} until the job finishes, then downloads and verifies the MP4.

The inputs that actually matter

The node gives you a lot of knobs. A beginner only needs these:

• prompt - required, non-empty, up to 10,000 characters. Leave it blank and the node refuses before it spends any money.
• model - locked to MiniMax-H3, and the casing matters. Don't touch it.
• ratio - this is where people trip. Pure text-to-video requires a fixed ratio (16:9, 9:16, …). The adaptive and auto options are only valid when you've connected a first_frame or last_frame; pick api_default to let a reference/keyframe job omit the field.
• audio_mode - api_default, lock_source, remix_source, reference_only, or native. Every mode except native needs drive_audio connected. native means "the model generates its own audio" - no input needed. lock_source pins the audio and forces denoise_strength to 0.

Reference material slots: up to 9 images (image1–image9), 3 videos (video1–video3, each with its own videoN_start_seconds offset), and 3 reference audios (audio1–audio3) - all separate from drive_audio, which doesn't count against that quota. first_frame and last_frame are your keyframes for image-to-video. Note the seed widget here is only a ComfyUI cache key (set it fixed to reuse a result); MiniMax-H3 doesn't get sent a seed, so don't expect it to control output.

Outputs

video (a local VIDEO you can wire into SaveVideo or a preview node), video_url (the raw link), task_id, and response (the full JSON). Result links are temporary - save anything you care about promptly.

Install and setup

Install via ComfyUI Manager (search ComfyUI Seedance or seedance), or:

cd ComfyUI/custom_nodes
git clone https://github.com/T8mars/ComfyUI_Seedance.git
cd ComfyUI
python -m pip install -r custom_nodes/ComfyUI_Seedance/requirements.txt

Then restart ComfyUI. The dependency list is refreshingly tiny - just requests; PyAV, torchaudio and scipy are used opportunistically when available. But you still need an API key from the api.seedance.nz console (the pack is a reseller storefront, affiliate links and all). Wire it up by dropping in a Seedance API Config node and connecting its api_config output, setting SEEDANCE_API_KEY, or creating config/.env in the plugin folder. All three are documented in the README.

Where people get burned

The node validates hard before submitting, and the error messages are honest: duration above 15 with no drive_audio, adaptive ratio with no keyframe, and reference_only combined with add_drive_as_reference=false all fail fast - good, because a failed job that you'd rather catch before paying. Watch out for multi-asset uploads being slow (per-token rate limiting; it auto-retries), and SSL certificate errors on the bundled Windows Python (update requests/certifi, or set SEEDANCE_SSL_VERIFY=0 only to debug). Test with 4 seconds at 480P before spending on a 768P 15-second job.