MiniMax H3 video extension in ComfyUI and Calliope

This tutorial explains how to extend MiniMax H3 videos in ComfyUI with the ComfyUI-MiniMax-H3-Extend custom node. The presenter chains context latents between segments while retaining reference images and giving each segment its own motion prompt. The first segment uses native reference-to-video nodes; later segments receive the previous sampler's latent output.

The demonstration starts with two character references and 12-second clips tested at 480p, then expands to four segments. A higher-resolution setting uses 0.8 megapixels, shown as 1216 × 672 pixels. The presenter reports continuity across camera changes and trims roughly the first second of the second segment to remove overlapping frames. Audio reference is described as a way to keep sound consistent between clips. These examples demonstrate the presenter's results rather than guarantee continuity for every generation.

The second part applies the extension mechanism in Calliope, an open source video studio described as locally installable. Its "continue from previous video" control requires a workflow with a video input. The imported ComfyUI workflow uses API format and accepts up to two reference images and one reference video, with FPS and megapixel settings. The presenter also explains how separate generation and extension workflows can support API or MCP calls. The tutorial does not specify hardware requirements or establish offline operation.