MiniMax H3 VLM System Instruction Presets Experimental

Same idea as the plain MiniMax H3 system-instruction presets, one twist: the presets here are the experimental timeline ones. UC_MiniMaxH3VLMSysInstrPresetsExperimental is the dropdown that holds minimax_h3_timeline_fl2va, minimax_h3_timeline_ref2va, and the "crude" variants - system instructions tuned for getting H3 to honor a prompt-driven timeline rather than drifting into its own idea of pacing.

If you're just doing ordinary text-to-video with H3, you don't need this node; the base preset in the non-experimental version is your starting point. You reach for this one when you're writing prompts that describe shots unfolding over time - "at 0.5s the camera pushes in" - and you want the encoder primed to treat that as a real structure. The experimental label is honest: these are newer strings than the core set, so if a generation behaves oddly, that's what the "experimental" warning is for.

What's on the node

• preset - the dropdown, defaulting to minimax_h3_timeline_fl2va. The fl2va / ref2va suffixes map to H3's frame-latent-to-video and reference-to-video conditioning modes, so pick the one that matches your workflow's conditioning path.
• system_instruction - the string output, feeding your H3 encoder node's system-instruction input.

One dropdown, one string. The value is that these strings encode the phrasing that keeps H3 on-timeline, which is fiddly to discover on your own.

Installing it

Via the pack:

• ComfyUI Manager: search "ComfyUI-UtilsCollection".
• Or:

cd ComfyUI/custom_nodes
git clone https://github.com/silveroxides/ComfyUI-UtilsCollection

Restart ComfyUI. No extra models for the node itself - the H3 weights are a separate, license-gated download.

Gotchas

Don't confuse this with the Advanced experimental variant: this one is the clean dropdown with no override fields. If you want to add your own system or user queries on top of an experimental preset, use UC_MiniMaxH3VLMSysInstrAdvPresetsExperimental. And remember these are the bleeding-edge strings - if you're chasing a reproducible result, prefer the stable presets and keep this node for when the stable ones aren't giving you the timeline control you need. Compare them back to back on a fixed seed; you'll feel the difference in pacing before you can measure it.