<p><strong>MiniMax H3 swaps characters while keeping every move and shot intact.</strong></p><p><strong>Who it's for:</strong> creators who want this pipeline in ComfyUI without assembling nodes from scratch. <strong>Not for:</strong> one-click results with zero tuning - you still choose inputs, prompts, and settings.</p><h3 id="open-preloaded-workflow-on-runcomfy">Open preloaded workflow on RunComfy</h3><p><a target="_blank" rel="ugc" href="https://www.runcomfy.com/comfyui-workflows/minimax-h3-character-replacement-comfyui-sam3-ref2va?utm_source=civitai&amp;utm_medium=referral">Open preloaded workflow on RunComfy (browser)</a></p><p><strong>Why RunComfy first</strong><br />- <strong>Fewer missing-node surprises</strong> - run the graph in a managed environment before you mirror it locally.<br />- <strong>Quick GPU tryout</strong> - useful if your local VRAM or install time is the bottleneck.<br />- <strong>Matches the published JSON</strong> - the zip follows the same runnable workflow you can open on RunComfy.</p><p><strong>When downloading for local ComfyUI makes sense</strong> - you want full control over models on disk, batch scripting, or offline runs.</p><p><strong>How to use (local ComfyUI)</strong><br />1. Load inputs (images/video/audio) in the marked loader nodes.<br />2. Set prompts, resolution, and seeds; start with a short test run.<br />3. Export from the Save / Write nodes shown in the graph.</p><p><strong>Expectations</strong> - First run may pull <strong>large weights</strong>; cloud runs may require a <strong>free RunComfy account</strong>.</p><hr /><h3 id="overview">Overview</h3><p>Replace a person or character in your video. Guide the new identity with a reference image. Keep the original motion and camera timing. Use SAM3 masks for precise subject control. MiniMax H3 maintains appearance across frames. Create clean swaps and outfit variations faster.</p><p><strong>Important nodes:</strong></p><h2 id="key-nodes-in-comfyui-minimax-h3-character-replacement-comfyui-workflow">Key nodes in Comfyui MiniMax H3 Character Replacement ComfyUI workflow</h2><h3 id="minimaxh3referencetovideo-(464)"><code>MiniMaxH3ReferenceToVideo</code> (#464)</h3><p>Central to identity transfer. It accepts a replacement image, a motion‑preserving video reference, and optional reference audio, then emits both the positive conditioning and an initial latent. Useful parameters to consider are <code>prompt</code>, <code>width</code>, <code>height</code>, and <code>length</code>. If you supply multiple references, keep them visually consistent to avoid identity drift.</p><h3 id="sam3_detect-(503)"><code>SAM3_Detect</code> (#503)</h3><p>Finds and segments the on‑screen subject that will be replaced. A short category prompt via <code>CLIPTextEncode</code> (#502) guides detection. Adjust the mask quality options only when the default selection misses the subject or includes background; cleaner masks typically yield more stable swaps.</p><h3 id="imagecompositemasked-(454)"><code>ImageCompositeMasked</code> (#454)</h3><p>Builds a performer‑focused reference from the sliced frames and SAM3 mask. Use <code>x</code>, <code>y</code>, and <code>resize_source</code> only if you need to align overlays or adapt frame scaling before sending images to the H3 reference input. The goal is a motion cue that isolates the actor while leaving scene geometry untouched.</p><h3 id="resolutionselector-(501)"><code>ResolutionSelector</code> (#501)</h3><p>Controls the target render size in a few clicks. Choose an aspect and megapixel budget that fit your hardware or turnaround needs. Start modest, confirm identity stability, then increase resolution for your final pass.</p><h3 id="samplercustomadvanced-(469)"><code>SamplerCustomAdvanced</code> (#469)</h3><p>Executes denoising using the scheduler, sampler, guider, noise, and starting latent. For faster look‑dev, try a lighter schedule or a sampler tuned for speed, then switch to your preferred quality settings once identity and timing look right.</p><h3 id="notes">Notes</h3><p><strong>MiniMax H3 Character Replacement ComfyUI | SAM3 Ref2VA</strong> - see <a target="_blank" rel="ugc" href="https://www.runcomfy.com/comfyui-workflows/minimax-h3-character-replacement-comfyui-sam3-ref2va?utm_source=civitai&amp;utm_medium=referral">RunComfy page</a> for the latest node requirements.</p>

MiniMax H3 Character Replacement ComfyUI | SAM3 Ref2VA

<p>Initial release - MiniMax-H3-Character.</p>

Files with SHA256: e350c3a7aaeaf811e658fad6d1567a6be5327eae33cfb85ece9b2227ebb4b43c