OpenShot-ComfyUI

OpenShot-focused ComfyUI nodes for robust video workflows.

This V1 intentionally stays close to standard ComfyUI primitives and types while fixing long-video SAM2 pain points.

What this includes (V1)

• OpenShotDownloadAndLoadSAM2Model
• OpenShotSam2Segmentation (single-image)
• OpenShotSam2VideoSegmentationAddPoints
• OpenShotSam2VideoSegmentationChunked (meta-batch/chunk friendly)

Why this exists

Some existing SAM2 video nodes accumulate entire-video masks in memory and can OOM on longer clips. This pack provides chunk-safe behavior while keeping Comfy-native node patterns.

Attribution

This project is inspired by and partially based on ideas and APIs from:

• kijai/ComfyUI-segment-anything-2
• Meta SAM2 research/code

Please see upstream projects for full original implementations and credits.

Requirements

• ComfyUI
• PyTorch (as used by your Comfy install)
• sam2 Python package / module available to Comfy runtime

Install this node pack into ComfyUI/custom_nodes/OpenShot-ComfyUI and restart ComfyUI.

Models

OpenShotDownloadAndLoadSAM2Model auto-downloads supported SAM2 checkpoints into ComfyUI/models/sam2 if missing.

Notes

• OpenShotSam2VideoSegmentationChunked returns only the requested chunk range (bounded memory) instead of collecting whole-video masks.
• For very long videos, pair chunked outputs with batch-safe downstream nodes (VHS meta-batch, staged processing, or on-disk intermediates).