ComfyUI-FrameIO

High-performance frame input/output nodes for AI video pipelines in ComfyUI.

ComfyUI-FrameIO focuses on efficient frame storage, loading, and reuse for long video generation workflows, solving common problems like massive PNG sizes, duplicate frames, and fragile filename-based loading.

---

✨ Features

🧩 Frame Saving

• Save batch IMAGE tensors as WebP
• Lossy or Lossless WebP
• Skip identical frames using hash-based deduplication
• Massive disk space reduction vs PNG
• Returns STRING_LIST (ComfyUI list-native)

📥 Frame Loading

• Pattern-based frame loading
• STRING_LIST → IMAGE loader (no filename guessing)
• Frame range selector (start, end, step)
• Auto-detect frame count (set frame_count=0)
• Execution Trigger node for flow control
• List Video Files node to scan input directory
• Safe with duplicate paths (from deduplication)

⚡ Optimized for AI Video

• Multi-threaded IO for high-speed saving & loading
• Direct PyTorch normalization (avoids slow CPU/NumPy conversions)
• Designed for long sequences
• Works with WebP / PNG / JPG
• Preserves exact frame ordering
• Security restricted (saves only to ComfyUI output directory)

---

📦 Included Nodes

🔹 Batch Save Image Sequence (WebP)

Save an image batch efficiently to disk.

Inputs

• images (IMAGE)
• path_pattern (STRING)
• start_index (INT)
• lossless (true / false)
• quality (INT)
• skip_identical (true / false)
• overwrite (true / false)

Outputs

• paths (STRING_LIST)
• count (INT)

---

🔹 Batch Load Image Sequence

Load images from disk using a filename pattern.

Inputs

• path_pattern (STRING) - e.g., ./frame{:06d}.webp
• start_index (INT)
• frame_count (INT) - Set to 0 to auto-detect all available frames
• ignore_missing_images (true / false)

Outputs

• images (IMAGE)
• count (INT)

---

🔹 Batch Load Image Sequence (Trigger)

Same as the standard sequence loader, but includes an optional trigger input. Useful for forcing ComfyUI to wait for a previous node (like a video render) to finish before loading.

---

🔹 Batch Load Image List (Advanced)

Load images directly from a STRING_LIST.

Inputs

• paths (STRING_LIST)
• start (INT, optional)
• end (INT, optional)
• step (INT, optional)

Outputs

• images (IMAGE)
• count (INT)

This is the recommended loader when using frame deduplication.

---

🔹 List Video Files (Input Dir)

Scans your ComfyUI input folder for video files.

Inputs

• subfolder (STRING) - Subfolder within the input directory.
• filter (STRING) - Wildcard filter (default *).
• load_cap (INT) - Maximum number of files to return (default 100, 0 for no limit).
• deep_search (true / false) - Search subdirectories recursively (default false).

Outputs

• paths (STRING_LIST) - List of absolute paths.
• count (INT) - Number of files found.

---

🧠 Why ComfyUI-FrameIO?

| Problem | Solution | |------|------| | PNG sequences too large | WebP (5–10× smaller) | | Duplicate frames | Hash-based skip | | Filename guessing | STRING_LIST loader | | Partial re-render | Frame range selector | | Long videos | Optimized IO |

---

🎬 Recommended Workflows

🔥 Best Practice (Long Videos)

KSampler
↓
Batch Save Image Sequence (WebP)
↓ STRING_LIST
Batch Load Image List (Advanced)
↓ IMAGE
Video Combine / FFmpeg

🎯 Partial Reload

• start = 300
• end = 900
• step = 2

Perfect for re-encoding or post-processing sections.

---

⚙️ Recommended Settings

| Use Case | Settings | |-------|---------| | Final video | Quality 95, Skip Identical = true | | Iteration | Quality 90 | | Dataset / archival | Lossless = true | | Static shots | Skip Identical = true |

---

📥 Installation

cd ComfyUI/custom_nodes
git clone https://github.com/room3dev/ComfyUI-FrameIO.git

Restart ComfyUI.

Nodes will appear under:

FrameIO

---

📄 License

MIT