Character Swap 1.5 pairs SAM 3.1 masking with motion transfer for eight-step video edits

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Character Swap 1.5 is a single ComfyUI workflow that separates video character replacement into two tasks: masking the subject and transferring the original motion to the new character. SAM 3.1 generates per-frame masks from a text prompt, replacing what was once manual rotoscoping. The motion transfer stage applies the source clip's body shape, limb timing and movement to the replacement. The author notes that most failures trace to the mask, such as occlusion, fast motion and hard edges that create halos, and advises feathering masks. The VDN8 variant uses a distilled sampler with eight steps per frame, which speeds rendering at a small cost to fine texture and facial detail.

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