H3 Character Swap 1.5 for ComfyUI: Verify the Subject Mask Before Rendering

Replacing a character in a crowded video depends on more than the prompt, since the workflow must first select the correct person and carry that mask through every frame. The H3 Character Swap 1.5 graph splits this job into SAM tracking for source selection, a dynamic crop for the editing region, H3 generation using image and video references, and a final uncrop step that returns the result to the frames. The author's export contains 47 nodes and 68 links, and the documentation states that the modified VDN8 combination has not yet passed GPU compatibility validation, so it should be treated as a starting point rather than a tested setup. Users are advised to check that the SAM target description matches the intended person, since a better replacement prompt cannot correct a wrong selection. The guide also flags a filename mismatch between a note and the active loader, along with the dependencies and settings that should be reviewed before running it on personal footage.