并发提交｜MiniMax H3 OW 视频生成（3 合 1）

MiniMax H3 OW is the pack's non-Fast lane into the H3 video family - text-to-video, image-to-video, and reference-to-video, at 480p/720p. If you've been following the H3 story (the KB tracks it as MiniMax's big multimodal video release), you know the model is the real deal; the OW API flavor here is the gateway's take on it. This node is the concurrent-submit wrapper around that 3-in-1, and it's one of the leaner ones in the pack - three models, a small field set, no audio slots.

Wrapper mechanics are the pack standard: validate parameters synchronously, push the job to a background video thread pool, return a SEEDANCE_VIDEO_FUTURE. That feeds SeedanceConcurrent_Video_Await, which waits on up to ten video futures and hands back finished VIDEO values in slot order. Run a t2v and an r2v against the same subject in one pass - two of these, one receiver.

The inputs that matter

• model - minimax-h3-ow-t2v, minimax-h3-ow-i2v, minimax-h3-ow-r2v.
• prompt - required for t2v and r2v; optional for i2v (drive it off the frame if you want).
• seconds - 5, 10, or 15.
• resolution - 480p or 720p.
• ratio - eight options from 1:1 to 21:9.
• image1 - required for i2v and r2v, ignored by t2v. There's exactly one image slot on this node; the multi-image path lives on the Fast sibling.

Plus the pack trio: api_config (or env var / config/.env), skip_error (placeholder video on failure instead of killing the batch), and seed as a ComfyUI cache seed - fixed reuses cached output when nothing else changed, which is how you avoid re-billing an unchanged run.

How it runs

Standard wrapper machinery: upload the reference frame if there is one, submit, poll, download, and only a clip that passes the MP4-header check counts as done. Since validation is synchronous, an i2v/r2v with no image1 fails at the node immediately - before it ever reaches the API or burns a slot in your batch.

Installing

# ComfyUI Manager: search "ComfyUI Seedance" → install → restart.
# or:
comfy node install seedance
# or:
cd ComfyUI/custom_nodes
git clone https://github.com/T8mars/ComfyUI_Seedance.git
cd ../.. && python -m pip install -r custom_nodes/ComfyUI_Seedance/requirements.txt

Only dependency is requests; no weights. API key via Seedance API Config, SEEDANCE_API_KEY, or config/.env.

Where people trip

• i2v/r2v without image1 - bounced at validation. There's no second image slot here, so multi-reference work means switching to the Fast/R2V node.
• t2v with image1 attached - ignored, not rejected. Harmless, but the model won't use it.
• Nothing but placeholders - that's skip_error + a failed slot; check the receiver's status_json for which job died and why.

Standard API-wrapper fine print: per-clip metering, your prompt and frame leave the machine, and result links are temporary - save what you keep.