Demonstrated on an RTX 5060 Laptop GPU with 8 GB VRAM and 32 GB system RAM. This is a reported test setup, not a minimum specification or a guarantee for every scene.
Before you start
- The MiniMax H3 model, text encoder, video/audio VAEs, and custom nodes identified in the tutorial.
- SAM 3.1 for object tracking and the source video you intend to edit.
- A compatible local ComfyUI environment with enough system RAM for model offloading.
Inside the tutorial
- 01
Select the working range
Use the H3 Timeline controls to choose the portion of the source video to edit. Confirm the loaded range before tracking or sampling.
Watch at 3:08 - 02
Track the intended object
Describe the source object in the tracking prompt, then inspect the object IDs and preview. For multiple objects, the selected indices and maximum-object setting must agree.
Watch at 4:34 - 03
Clean the mask and release SAM
The workflow unloads the tracking model before generation. Mask cleanup controls remove short-lived artifacts and adjust edge coverage; they need to suit the actual clip.
Watch at 6:06 - 04
Regenerate a smaller working area
The crop reduces the area H3 must process. An aligned update mask defines the editable region, while a separate feathered mask blends the result into the original video.
Watch at 7:00 - 05
Describe the replacement
The generation prompt describes the desired result. In the demonstrated object replacement, the original object belongs in the tracking prompt, not the replacement prompt.
Watch at 8:59
What to keep in mind
- Tracking and mask quality directly affect the edit. Check previews for missing edges, incorrect object IDs, and temporal gaps.
- The crop dimensions and cleanup values shown are clip-specific examples, not universal settings.
Source reviewed August 31, 2026. These notes summarize the published tutorial; they are not a new hardware test or a separately verified workflow release.
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