ComfyUI-Wan-VACE-Video-Joiner Update Smooths Video Transitions

ComfyUI-Wan-VACE-Video-Joiner is a workflow tool that automatically stitches multiple video clips together while creating smooth transitions between them. The system uses VACE (Video-to-Video) technology to generate new frames at each transition point, replacing awkward cuts with natural motion that flows from one clip to the next. Users point the workflow at a directory of clips, and it processes them in sequence.

The workflow handles input from various sources including Wan, LTX-2, phone recordings, and stock footage. Version 2.5 introduces seamless looping capabilities and significantly reduced RAM usage during final video assembly. The tool supports both Wan 2.1 VACE and Wan 2.2 Fun VACE models.

Key capabilities for video editing

• Automatically joins clips from any video source into a single sequence.
• Generates context-aware frames at transition points for smooth motion flow.
• Creates seamless loops with a toggle for continuous playback videos.
• Configurable context and replacement frame counts for custom transitions.
• Reduced system RAM consumption during final video assembly.
• Processes anywhere from a few clips to dozens in a single batch.

Video creators working with AI-generated content from different models will find this particularly useful for combining outputs into cohesive projects. The tool eliminates the need for manual transition editing by generating intermediate frames that bridge the gap between disparate clips, regardless of their origin.

General setup and compatibility notes

The developer notes that users upgrading from previous versions must also update the Wan VACE Prep node package to version 1.0.12 or higher. The workflow has not been tested under the ComfyUI Nodes 2.0 renderer, so results may vary depending on the environment. Known limitations include occasional brightness or color shifts in generated frames, which the developer acknowledges may be inherent to the underlying VACE model.

Users experiencing color issues can try interpolating framerate up to 30 or 60 fps after processing, which spreads the shift across more frames and makes it less noticeable. The developer also clarifies that input video dimensions must be divisible by 16.

'If you can't make the workflow work, update ComfyUI and try again,'

the documentation advises.

The workflow offers practical value for anyone combining video clips without expensive editing software. It handles the technical complexity of creating natural transitions between disparate footage sources.

ComfyUI-Wan-VACE-Video-Joiner can be installed from their GitHub.