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feat(minimax-h3): default workflows; starter-model decision documented (PR 5/5) - #60
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Two default workflows following the Wan video precedent. The i2v variant wires the one First Frame image node and shared Width/Height integer nodes to the prompt, frame-conditioning and denoise nodes so the backend's keyframe-coupling contract holds structurally. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
The installer cannot express 'root layout minus the Ref2VA subtrees': a bare repo source pulls ~498 GB and a subfolder-set source drops the root modular_model_index.json the probe requires. Records the unblock options and the MiniMax H3 Community License constraints any future entry must carry. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…ult workflow Adds a 'MiniMax H3 Ideal Dimensions' node (mirroring the Wan 2.2 Ideal Dimensions pattern): a thin wrapper over the vendored resolve_canvas_size policy — 768px short edge, soft 768x1344 area cap, both axes snapped to the 32 grid, aspect ratios 1:4 through 4:1. Unlike the Wan nodes there is no resolution preset or rounding mode: H3 was released for exactly one canvas family and the policy is the released pipeline's, verbatim. The 'First Frame to Video - MiniMax H3' default workflow now derives the canvas from the uploaded image (image width/height -> ideal dimensions -> prompt/frame-conditioning/denoise), matching 'Image to Video - Wan 2.2 Lightning'. The manual Width/Height form fields are gone - previously a mismatched aspect ratio stretched the keyframe onto whatever canvas was typed in. openapi.json/schema.ts regenerated for the new node. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
lstein
requested review from
JPPhoto,
Pfannkuchensack and
blessedcoolant
as code owners
August 7, 2026 18:10
Only conflict was the generated schema.ts, regenerated from the merged source (scripts/generate_openapi_schema.py + pnpm typegen) rather than hand-merged. openapi.json auto-merged and was regenerated alongside it. starter_models.py auto-merged, so it was checked by hand: main's FLUX.2 [dev] region and this branch's MiniMax H3 region are both present in the result. Checked for the two failure modes the earlier syncs in this stack hit: no persisted-state migration collision (this branch touches no redux slice), and the five vendored minimax_h3 files still differ from huggingface/diffusers@abc5e9bf71 by import lines only. Verified: 149 passed / 4 skipped backend, 1738 frontend tests across 144 files, tsc clean, ruff check + format clean. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Note
Port of lstein#144 to the InvokeAI-7 tree. Mechanical replay of the original commits onto v7
main(4a48a37967);openapi.json/schema.tsregenerated and verified drift-free at every level, and thedependencies.pyauto-merge verified by hand. All changes target the backend and the existingfrontend/webapp -webv2is untouched (H3 support in the new UI is future work). Review history and test notes live on the original PR.Note
Supersedes lstein#142, which GitHub auto-marked as merged (and auto-deleted the branch) when a botched force-push briefly made the head ref equal to its base during a stack rebase. No content was ever merged; this PR carries the identical (rebased) commits.
Summary
PR 5 of 5 in the MiniMax H3 stack (on top of lstein#141): default workflows, plus a documented decision on the starter-model entry. Two commits, deliberately separated so the license-sensitive part stays droppable.
Commit 1 — default workflows
video_latents/audio_latentsand the video+audio VAE edges. Form exposes model, prompt, width/height, frames, steps. Notes cover the 17n+5 frame grid, fixed 24 fps, 32-px dimension grid, muxed AAC audio, and the absence of a negative prompt.minimax_h3_frame_conditioning. The backend's keyframe-coupling contract is enforced structurally: a single image node feedsfirst_imageon both the prompt and frame-conditioning nodes, and shared width/height integer nodes feed prompt + frame conditioning + denoise — form edits cannot desynchronize them.Commit 2 — starter model: documented TODO, no entry
Neither expressible install source works, so no entry ships yet:
MiniMaxAI/MiniMax-H3source downloads ~498 GB —filter_fileskeeps everymodel*.safetensorsacross all subtrees, includingFL2VA/,Ref2VA/, andtransformer_ref/.::subfolder+subfoldersyntax keeps only files inside the listed subfolders and silently drops the rootmodular_model_index.jsonthat the H3 probe hard-requires — the install would land as an unknown model.The TODO in
starter_models.pyrecords both unblock paths (a root-config-awarefilter_files, or an upstream FL2VA-only repo) and the MiniMax H3 Community License constraints (territory exclusions extend to outputs; "MiniMax H3" attribution). Until then, users install the model manually by pointing the Model Manager at a locally assembled fl2va folder (~42.5 GB working set).Testing
tests/app/services/model_install+tests/app/services/workflow_records+tests/model_identification: 146 passed, 0 failures; ruff clean.WorkflowValidator.validate_json, and every edge handle was checked against the actual invocation input/output models.🤖 Generated with Claude Code