Save Original MP4 (VHS) + RIFE FPS Controller

ComfyUI Save Original MP4 + RIFE FPS Controller

Two lightweight ComfyUI custom nodes designed for batch video upscaling and frame interpolation. Developed for Ultimate Image - Video Upscaler by AI WaifuHen, with assistance from ChatGPT.

Included nodes

Save Original MP4 (VHS)

Finalizes a VideoHelperSuite MP4 with muxed audio, using the input video's original filename instead of the extra VHS numbering.

• Takes VHS Video Combine → Filenames (VHS_FILENAMES)
• Takes FolderBatch Video Queue → file_name (STRING)
• Saves ComfyUI/output/RelayVSR_Upscaled/<source-filename>.mp4 by default
• Supports skip, overwrite, or rename when a target exists
• Optional remove_intermediates: deletes only the related silent MP4, PNG preview, and source muxed MP4, after copying and checking the output
• Never intentionally deletes the input video
• Does not encode or upscale videos itself; VHS handles encoding and audio

Important: This implementation expects VHS to produce exactly one -audio.mp4 file. If the input video has no audio and VHS does not create that file, the node raises an error and preserves intermediates. The optional ffprobe validation runs only if ffprobe is on PATH. Test with short disposable videos before batch processing.

RIFE FPS Controller

Calculates output FPS for native ComfyUI RIFE frame interpolation.

• Inputs: original fps and multiplier (2, 3, or 4)
• Outputs: output_fps = fps × multiplier and the same integer multiplier
• Connect multiplier to the native FrameInterpolate node
• Connect output_fps to the FPS selection switch, and the selected FPS to VHS Video Combine.frame_rate
• Put the controller and native RIFE nodes in an optional/bypass group, keeping the switches outside it, so disabling interpolation selects the original FPS and images

For example, 24 FPS with RIFE x2 becomes 48 FPS; with RIFE x3 it becomes 72 FPS.

Requirements

• ComfyUI
• ComfyUI-VideoHelperSuite for the VHS_FILENAMES input and MP4/audio creation
• A folder/video queue that provides the source video filename, such as ComfyUI-FolderBatch, for source-name automation
• Native FrameInterpolationModelLoader and FrameInterpolate nodes if you use RIFE

There are no additional Python packages required by these two nodes. External libraries required by VHS and ComfyUI must be installed separately.

Installation

ComfyUI Manager / Registry: Once this repository is published to Comfy Registry, search for Save Original MP4 in Manager.

Manual installation:

cd ComfyUI/custom_nodes
git clone https://github.com/aiwaifuhen-oss/ComfyUI-SaveOriginalMP4.git

Restart ComfyUI after installation. If a manually installed copy of the same node is already present, remove that old copy before installing through Manager to avoid duplicate node identifiers.

Example workflow

FolderBatch Video Queue → VHS Load Video → (optional RIFE) → RelayVSR → VHS Video Combine
             └─ file_name ────────────────────────────────────────────────┐
                                       VHS Filenames ─────────────────────┤
                                                               Save Original MP4

Connect the original audio and the correctly selected FPS to VHS Video Combine. The RIFE FPS Controller changes the declared output frame rate; it does not itself interpolate frames.

Notes and safety

• Use output subfolders inside ComfyUI's configured output directory.
• When on_existing=skip, the existing final output remains, and VHS intermediate files are deliberately retained.
• overwrite replaces an existing output; rename adds a numbered suffix.
• Avoid processing a source folder that includes previous upscaled outputs.
• If VHS fails to mux audio or the saved MP4 is invalid, inspect the retained intermediate files.
• Always make a backup before enabling cleanup for the first time.

Version

1.1.0 – Save Original MP4 (VHS) and RIFE FPS Controller.

Contributing / Issues

Use GitHub Issues and include ComfyUI version, VideoHelperSuite version, and reproducible steps. Do not post private file paths or prompts.

License

MIT.