comfyui-jjmaden-random-nodes

ComfyUI_My_Custom_Nodes

A personal collection of 12 ComfyUI custom nodes: 7 general-purpose workflow utilities, plus 5 nodes that fill in gaps around a third-party MiniMax H3 video workflow that referenced node types with no public source.

Table of Contents

• Installation
• Utility Nodes
  • Dynamic Image Router
  • Image Hub
  • Model Switch (DualModelDPDTSwitch)
  • Sampler Switch (MultiInputSamplerSwitch)
  • LTX Latent Resizer
  • Power Lora Hooks
  • Random Line From File (Wildcard)
• MiniMax H3 Nodes
  • MiniMax H3 Resolution Selector
  • MiniMax H3 Concat AV Latent
  • MiniMax H3 Unified To Video
  • MiniMax H3 Audio Lock
  • MiniMax H3 Multimodal Chat
• Appendix A: Seed Configuration Matrix
• Appendix B: Wildcard Text File Formatting Guide

Installation

Licensed under MIT.

Drop this folder into ComfyUI/custom_nodes/ and restart ComfyUI. LTXLatentResizer, RandomLineFromFile, MiniMaxH3ConcatAVLatent, and MiniMaxH3AudioLock have no extra dependencies beyond ComfyUI itself. UniversalImageHub ships a paired JS file (web/image_hub.js, loaded via WEB_DIRECTORY) that adds "🔄 Refresh File List" and "Paste from Clipboard" buttons to the node. MiniMaxH3ResolutionSelector similarly ships web/minimax_h3_resolution_selector.js, which makes its aspect_ratio widget actually filter resolution's dropdown (see that node's own section below).

MiniMaxH3UnifiedToVideo and MiniMaxH3ConcatAVLatent/MiniMaxH3AudioLock require a ComfyUI build with MiniMax H3 support (comfy.nested_tensor, minimax_ref_items/minimax_keyframes/minimax_refs conditioning support). MiniMaxH3MultimodalChat requires a locally-running LLM backend (Ollama, LM Studio, or KoboldCpp) — nothing is called over the network except to whatever base_url you point it at.

Three other node names that show up in the same MiniMax H3 workflow this pack was built to support are real and not included here — install/update these instead of looking for them in this pack:

Node	Where it actually lives
MiniMaxH3SigmaShift	ComfyUI core
MiniMaxH3MemoryEfficientSageAttentionPatch	ComfyUI-KJNodes
MiniMaxH3ReferenceSplitter	the "Fantastic H3 Prompt Builder" pack

Utility Nodes

Dynamic Image Router

Category: utils · File: dynamic_image_switch.py

Routes one incoming IMAGE batch to exactly one of 10 numbered outputs (out_1...out_10), selected by an integer widget.

Inputs: images (IMAGE, required), select_path (INT, 1–10, default 1).

Outputs: out_1 through out_10 (all IMAGE). Exactly one carries the input batch; the other nine are blocked.

Behavior: The 9 unselected outputs use ComfyUI's ExecutionBlocker mechanism, which prevents anything downstream of them from executing at all — not just from running on empty data. This means a node on an unselected branch that does image[0] instead of image[:1] won't crash on a path you never chose, because that node simply never runs. On ComfyUI builds that predate ExecutionBlocker, the node falls back to handing unselected outputs an empty (0, 64, 64, 3) image tensor instead — downstream nodes that loop over a batch (PreviewImage, SaveImage, VAEEncode) handle that fine, but anything indexing with image[0] on that fallback path can still error.

Practical use case: switching between multiple possible image sources (e.g. different LoadImage nodes, or di