MiniMax-H3 Multishot Workflow

Chain multiple MiniMax-H3 shots into one continuous video with audio - in

one node. Each shot starts from the last frame of the previous one; the

duplicated seam frame and its 1/24s of audio are trimmed automatically.

The demo below was made by this workflow: 30 seconds, three chained shots

from one script, same presenter and same voice across both seams, rendered on

the Q5_1 GGUF.

Files

H3_Multishot_AIO.json - easy mode: loaders > script box > one sampler

node > save. Write one prompt per shot with --- between them, pick a

shot count (0 = one shot per prompt, 1-8 forces it), queue.

H3_Keyframes.json - keyframes at any position, not just first/last.

Up to 6 anchor images placed by fraction (0, 0.5, 1) or absolute frame

index, in a single generation - so the audio is one continuous stream.

H3_Multishot_MEMORY.json - long form (2-5 minutes). Keeps a persistent

identity anchor so drift cannot compound across many shots.

Requirements

ComfyUI v0.30.0+ (native MiniMax H3 support)

The node pack: ComfyUI-H3-Multishot (Manager > Install via Git URL;

includes the one-line ComfyUI-GGUF architecture patch)

Models: MiniMax-H3 GGUF quants (Q5_1 for 24-32 GB cards, Q4_0

for 16 GB) or the originals; text encoder + VAEs from

Comfy-Org/MiniMax-H3

Notes

frames_per_shot sits on H3's 17k+5 frame grid (243 = ~10.1s at 24 fps;

362 = ~15.1s, the trained max).

End every shot on what the NEXT shot expects to see - the chain hands each

shot the previous final frame, and matching that bridge to the next shot's

framing is what makes seams invisible.

Malformed JSON scripts fail loudly instead of rendering the raw text.

v1.2 (2026-08-04)

Keyframes at any position. Stock ComfyUI pins H3 keyframes to the first

and last frame and raises only first/last keyframe anchors are supported

for anything else. That is a positional-maths limit, not a model limit -

both stock cases are the same expression:

  cond_t = text_len + FRAME_RESCALE * pixel_index

which is defined for every frame. Measured on an RTX 5090, 243 frames, one

anchor at pixel frame 121: the rendered frame closest to the anchor image was

frame 122 - off by one - reached by continuous motion with no cut, audio

unbroken through it. A three-anchor run landed frames 121 and 242 exactly.

Applied in memory; it does not edit any ComfyUI file, self-tests against the

stock formula, and rolls back if first/last positions do not reproduce.

Move vs cut. Anchor images with a plausible camera path between them make

H3 interpolate. Images with no possible path (a kitchen and a diner) make it

cut, then hold - stock first/last does the same with such a pair, so that is

the model, not the node. The cut case is still useful: a timed shot change

inside ONE generation, which keeps the audio continuous across it.

Two new controls: H3 Condition Strength (exposes

minimax_visual_cond_noise_aug / minimax_audio_cond_noise_aug, read by

ComfyUI core but written by no stock node) and H3 Reference Audio, a

stereo guard - a mono reference clip crashes the sampler with an unhelpful

shape mismatch because the layout reserves two channels.

v1.1 (2026-08-04)

Image-to-video. The Multishot Sampler now takes an optional start_image.

Connect a LoadImage and shot 1 starts from that frame, then chains as usual.

Leave it unconnected for unchanged text-to-video behaviour - v1.0 graphs keep

working.

~4x faster on 32GB cards. The text encoder is evicted before sampling.

The Qwen3-VL encoder (~16.5GB even at Q4) and the H3 DiT (~25GB) do not co-fit

on 32GB, so the DiT was loading partially and streaming ~19GB from system RAM

every step. Measured on an RTX 5090: ~60 min -> ~15 min for the same render.

Text encoder GGUF + mmproj published:

joeygambino/MiniMax-H3-encoder-GGUF.

The mmproj sidecar is required for multi-shot, not just for reference

images - shot chaining feeds the previous frame through the encoder's vision path.

Render at H3's native resolution and upscale afterwards: native 1920x1088

measured worse than 960x544 in blind review and cost ~4x the time.

Node pack: ComfyUI-H3-Multishot

On Civitai

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