RunningHub MiniMax H3 FL2VA Last Only (Legacy)

This is the "last frame only" keyframe node, and it deserves a moment of honesty: it exists because FL2VA's conditioning takes a MINIMAX_H3_FL_KEYFRAMES object, and this is the third way to build one. First-only anchors the start; first+last bookends the clip; this one anchors only the end and lets the model free-run up to it. Same shape, same output type, different creative intent.

Inputs

• last_frame - required, an IMAGE. The destination frame. H3 has to invent a path from wherever the prompt leads to this specific endpoint.

Output: keyframes (MINIMAX_H3_FL_KEYFRAMES), feeding the FL2VA Target → Encode chain exactly like the first-frame node's output.

When "last only" actually makes sense

You'd think a model trained to fill between frames would be confused by only knowing the endpoint, but it turns into a genuinely different control: backward constraint. If you know exactly what the final shot needs to be - a logo resting in place, a character's final expression, a product's end state - last-only forces that outcome while leaving the opening free. Pair it with a strong prompt for the opening action and you've got a shot that ends exactly where you need it and begins wherever the model wants. That's surprisingly handy for edit-friendly generation: cut into it later, and the out-point is guaranteed.

The flip side is that with no first frame, the start is a coin flip run to run, so if your whole clip depends on a specific first frame, use RHMiniMaxH3FL2VAFirstFrameCondition with the last frame plugged into its optional slot instead.

Install

cd ComfyUI/custom_nodes
git clone https://github.com/RH-RunningHub/ComfyUI-RH-MiniMax-H3.git
pip install -r ComfyUI-RH-MiniMax-H3/requirements.txt

Restart, and have the ~95 GiB INT8 ConvRot bundle in ComfyUI/models/MiniMax-H3-INT8-CONVROT/ (HF Gluttony10/MiniMax-H3-INT8-CONVROT, ModelScope in China). Legacy node - old FL2VA workflows use it; new ones fold it into RHMiniMaxH3VideoGen. License as pack-wide: H3's Community License excludes the US, EU, UK and South Korea from local-weights use.