Add MiniMax H3 extender import and 3070 R2V variant

2026-08-16 09:55:41 +00:00
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+# MiniMax H3 Extender Ref2VA
+
+## Summary
+
+Imported `MiniMax H3` continuation workflow based on
+`tritant/ComfyUI_MiniMax_H3_Extender`. This is a `Ref2VA`-first extender with
+shared image references, optional audio reference, Motion Context continuity,
+validated clip-by-clip reuse, and final joined video/audio decode.
+
+## Model Family
+
+- `minimax`
+
+## Status
+
+- `imported-only`
+
+## Source
+
+- Repo: <https://github.com/tritant/ComfyUI_MiniMax_H3_Extender>
+- Workflow file: <https://github.com/tritant/ComfyUI_MiniMax_H3_Extender/blob/main/Workflow/MiniMax_Extender.json>
+- Original publisher: `tritant`
+- Date imported: `2026-08-16`
+
+## Developer notes
+
+- The upstream node is built around a single horizontal sequence node instead of
+  a large repeated graph.
+- It keeps a validated disk cache, supports `clip_by_clip` and `full_batch`,
+  and is explicitly designed for longer `MiniMax H3` continuation chains.
+- The upstream README says it combines `Ref2VA`, Motion Context, disk caching,
+  per-clip prompts, per-clip seeds, and final decode/export into a simpler
+  flow.
+
+## Our notes
+
+- This import is worth keeping because it is natively `reference-to-video`
+  oriented and closer to Chris's actual MiniMax use than generic `t2v` graphs.
+- I replaced the source repo's very specific demo clip script with a neutral
+  reusable starter clip state so the imported workflow opens as a practical
+  template instead of someone else's scene.
+- The graph still uses the upstream source-leaning stack, so it is more of a
+  donor / comparison import than the first `3070` workflow to run.
+
+## Required custom nodes
+
+- `ComfyUI_MiniMax_H3_Extender`
+
+## Required models
+
+- `MiniMax H3` `Ref2VA` checkpoint
+- matching `MiniMax H3` text encoder
+- `MiniMax H3` video VAE
+- `MiniMax H3` audio VAE
+- optional turbo LoRA path if enabled
+
+## Notes
+
+- Use this when you want the upstream extender logic itself.
+- For the tighter local-first variant, use the optimized companion workflow in
+  `optimized/image-to-video/minimax-h3-extender-3070-r2v-480p-clip-by-clip/`.