ComfyUI-H3-SeedScout: Audition H3 Seeds Before Full Render

ComfyUI Wikinews

tsuremen's new ComfyUI node scouts multiple seeds through the first steps of the MiniMax H3 schedule, shows live previews on the node, and finishes only the seed you pick.

tsuremen released ComfyUI-H3-SeedScout on August 5, a Seed Scout Sampler for MiniMax H3 that auditions many seeds cheaply, shows an animated preview per seed right on the node, and then finishes only the seed you pick. One queued prompt, one full-quality result.

Full MiniMax H3 generations take minutes, so the usual workflow of "render, check, re-roll a different seed" wastes a lot of GPU time. The Seed Scout node instead runs every candidate seed through just the first few steps of the same sigma schedule (a true "step 3 of 20", not a separate low-step run), previews the result, and continues your chosen seed's exact latent through the remaining steps.

Seed Scout node waiting for selection with six seed previews

The node shows an animated preview per seed and pauses until you pick one.

How It Works

The node replaces RandomNoise + SamplerCustomAdvanced in a MiniMax H3 workflow:

InputFrom
guiderBasicGuider
samplerKSamplerSelect
sigmasBasicScheduler (full schedule, e.g. 20 steps)
latent_imageMiniMax H3 latent (e.g. MiniMaxH3ImageToVideo)
vaeH3 video VAE (optional, for previews)

Scouted seeds use the same noise as RandomNoise, so any seed also reproduces in a stock workflow. Visible widgets: seed_start, seed_count, scout_step (pause step) and selection_timeout (0 = wait forever). Advanced options live under the ⚙ button.

Modes

  • interactive (default): previews appear as they finish; click a seed to preview, double-click or Continue ▶ to run the remaining steps on it. Needs a browser connected; headless runs fall back to the first seed.
  • scout: previews only, saves one labelled WebP per seed to the output folder, no pausing. Built for API/headless seed hunting.
  • final: behaves exactly like SamplerCustomAdvanced with a fixed selected_seed.

Preview Options

  • vae (default): decodes previews with the real H3 video VAE; preview_frames=124 at 24 FPS previews full clips in real time.
  • tae: fast tiny-VAE previews via Kijai's taeh3, with KJNodes as a dependency. The optional TAE integration had a frozen-preview bug at launch, traced by LukeG89 to the --disable-api-nodes launch argument and fixed by Kijai's KJNodes patch.
  • latent2rgb: free fallback, no extra files.

Installation

cd ComfyUI/custom_nodes
git clone https://github.com/tsuremen2/ComfyUI-H3-SeedScout

Restart ComfyUI and hard-refresh the browser. Requires ComfyUI with native MiniMax H3 support (0.30.0 or later).

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ComfyUI-H3-SeedScout: Audition H3 Seeds Before Full Render | ComfyUI Wiki