MajoorWaldi-ComfyUI-Majoor-AssetsManager/docs/CUSTOM_NODES.md

Custom Nodes Reference

Majoor Assets Manager provides two ComfyUI nodes that embed generation timing metadata directly inside saved files. The asset manager's indexing pipeline then reads this metadata automatically.

Source: nodes.py

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〽️ Majoor Save Image 💾

Node name: MajoorSaveImage Category: Majoor Display name: 〽️ Majoor Save Image 💾

Drop-in replacement for ComfyUI's built-in SaveImage node. Saves PNG files to the standard output directory with generation_time_ms persisted in the PNG text chunks.

Inputs

Input	Type	Required	Default	Description
images	IMAGE	✅	—	The image batch to save
filename_prefix	STRING	✅	Majoor	Filename prefix. Supports ComfyUI formatting placeholders (%date%, %batch_num%, etc.)
generation_time_ms	INT	❌	-1	Generation time in milliseconds. Set to -1 for automatic detection from the prompt lifecycle

Hidden Inputs

Input	Type	Description
prompt	PROMPT	Full ComfyUI prompt graph (auto-provided)
extra_pnginfo	EXTRA_PNGINFO	Additional PNG metadata (workflow, etc.)

Metadata Written

Each saved PNG contains the following text chunks:

Key	Content
prompt	Full prompt graph as JSON
workflow	Full workflow as JSON (via extra_pnginfo)
generation_time_ms	Elapsed time since prompt start, in milliseconds
CreationTime	ISO 8601 timestamp (YYYY-MM-DD HH:MM:SS)

Output

Returns a UI result with the list of saved images (filename, subfolder, type) for ComfyUI's preview system.

Example Usage

1. Connect any image output to the images input
2. Optionally set a custom filename_prefix
3. Leave generation_time_ms at -1 for automatic timing
4. The node saves PNGs to ComfyUI/output/ with full metadata

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〽️ Majoor Save Video 🎬

Node name: MajoorSaveVideo Category: Majoor Display name: 〽️ Majoor Save Video 🎬

Saves a VIDEO input or a batch of IMAGE frames as a video file. Uses PyAV for MP4 encoding (same approach as ComfyUI's native SaveVideo node) and Pillow for GIF/WebP.

Inputs

Input	Type	Required	Default	Description
filename_prefix	STRING	✅	MajoorVideo	Filename prefix
format	COMBO	✅	mp4 (h264)	Output format: mp4 (h264), gif, webp
images	IMAGE	❌	—	Batch of frames to encode as video
video	VIDEO	❌	—	A VIDEO input (from LoadVideo, CreateVideo, etc.)
frame_rate	FLOAT	❌	24.0	Frames per second (1–120). Ignored when video input carries its own frame rate
loop_count	INT	❌	0	Loop count for GIF/WebP. 0 = infinite loop
generation_time_ms	INT	❌	-1	Generation time in ms. -1 = auto-detect
audio	AUDIO	❌	—	Audio track to mux into the MP4 container
crf	INT	❌	19	Constant Rate Factor (0–63). Lower = higher quality, larger file
save_first_frame	BOOLEAN	❌	true	Save a PNG sidecar of the first frame with full metadata

Hidden Inputs

Input	Type	Description
prompt	PROMPT	Full ComfyUI prompt graph
extra_pnginfo	EXTRA_PNGINFO	Additional metadata (workflow, etc.)

Input Resolution

At least one of images or video must be connected:

• video input (priority): frame tensor, frame rate, and audio are extracted via video.get_components(). The frame_rate widget is ignored.
• images input (fallback): frames are taken from the IMAGE batch, and frame_rate / audio widgets are used.
• Neither connected: the node produces no output.

Metadata Written

MP4 (h264)

Metadata is embedded directly in the MP4 container using PyAV with movflags=use_metadata_tags:

Key	Content
prompt	Full prompt graph as JSON
workflow	Full workflow as JSON
generation_time_ms	Elapsed time since prompt start, in milliseconds
CreationTime	ISO 8601 timestamp

These tags are readable by FFProbe (ffprobe -show_format_tags) and ExifTool.

GIF / WebP

Animated GIF and WebP formats do not support arbitrary metadata. When save_first_frame is enabled (default), a PNG sidecar is saved alongside the animation with full metadata in its text chunks. The asset manager indexes this sidecar automatically.

Video Encoding Details

• Codec: libx264, pixel format yuv420p
• Quality: controlled by crf (default 19)
• Audio: AAC codec, supports mono/stereo/5.1 layouts
• Frame rate: stored as an exact fraction for precision

Output

Returns a UI result with the saved video file(s) for ComfyUI's preview system.

Example Usage

From IMAGE batch:

1. Connect a batch of images to images
2. Set format to mp4 (h264)
3. Adjust frame_rate and crf as needed
4. The node saves an MP4 to ComfyUI/output/

From VIDEO input:

1. Connect a VIDEO output to video
2. The node uses the video's native frame rate and audio
3. Set format and crf to control encoding

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Auto-Detection of generation_time_ms

Both nodes support automatic generation time measurement. When generation_time_ms is set to -1 (default), the node computes the elapsed time by reading the prompt start time from Majoor's runtime_activity module.

How It Works

1. When ComfyUI starts executing a prompt, runtime_activity records time.monotonic() as last_started_at
2. When the save node runs, it computes (time.monotonic() - last_started_at) * 1000 to get milliseconds
3. This value is written into the file metadata

Manual Override

Connect an INT value to generation_time_ms (any value ≥ 0) to override automatic detection. This is useful for:

• Measuring only part of a workflow
• Importing timing from external sources
• Testing and debugging

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〽️ Majoor GenInfo Override 🧩

Node name: MajoorGenInfoOverride Category: Majoor Display name: 〽️ Majoor GenInfo Override 🧩

Adds custom/manual GenInfo fields that can be consumed by Majoor Save nodes so the final saved asset includes your override data in embedded metadata.

Typical Use Case

Use this node when you want to:

• override detected values shown in GenInfo,
• inject custom fields for downstream indexing/search,
• attach additional manual context before saving with Majoor Save Image or Majoor Save Video.

Integration Notes

• Place the node upstream of your Majoor Save node path.
• Save nodes serialize the merged metadata into file metadata (PNG text chunks or MP4 tags where applicable).
• Indexed assets then expose those values in Majoor Assets Manager GenInfo and metadata search flows.

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Extraction Pipeline

When assets are indexed by Majoor Assets Manager, generation_time_ms is extracted through the following chain:

PNG Files

1. read_png_text_chunks() reads the generation_time_ms text chunk → PNG:Generation_time_ms
2. _merge_png_exif() merges it into the EXIF data dict
3. _apply_rating_tags_and_generation_time() extracts the integer value → metadata["generation_time_ms"]
4. _best_effort_generation_time_ms() finds it at the top level and returns it for DB storage

MP4 Files

1. FFProbe reads the container format tags (including generation_time_ms)
2. apply_video_ffprobe_fields() extracts it from format.tags.generation_time_ms
3. _best_effort_generation_time_ms() finds it and returns it for DB storage

Fallback Behavior

When the Majoor save nodes are not used (e.g., standard SaveImage or third-party nodes), the asset manager falls back to:

• EXIF DateTimeOriginal / CreateDate for generation_time (date-based, not duration)
• Prompt graph analysis for workflow metadata
• No generation_time_ms is stored (column remains NULL)