What is comfyui_viewer_openreel_extension?

wasasquatch/comfyui_viewer_openreel_extension — explained in plain English

Analysis updated 2026-05-18

★ 74PythonAudience · developerComplexity · 4/5LicenseSetup · moderate

Mindmap

mindmap
  root((OpenReel Extension))
    What it does
      Embeds video editor in ComfyUI
      Timeline effects and transitions
      Bundle and unpack nodes
      Server side FFmpeg render
    Tech stack
      Python
      ComfyUI
      FFmpeg
      JavaScript frontend
    Nodes
      Bundle Video
      Bundle Images
      Bundle Audio
      Unpack
    Audience
      ComfyUI workflow builders
      AI video creators

mindmap root((OpenReel Extension)) What it does Embeds video editor in ComfyUI Timeline effects and transitions Bundle and unpack nodes Server side FFmpeg render Tech stack Python ComfyUI FFmpeg JavaScript frontend Nodes Bundle Video Bundle Images Bundle Audio Unpack Audience ComfyUI workflow builders AI video creators

What do people build with it?

USE CASE 1

Edit AI-generated video frames from AnimateDiff or SVD workflows with a built-in timeline editor.

USE CASE 2

Add transitions, text overlays, and keyframe animation to generated video without a separate editor.

USE CASE 3

Combine video, image, and audio outputs from different workflow branches into one editable project.

USE CASE 4

Import and edit existing video files from disk directly inside a ComfyUI workflow.

What is it built with?

PythonComfyUIFFmpegJavaScript

How does it compare?

	wasasquatch/comfyui_viewer_openreel_extension	ltczding-gif/ref-downloader	humanmllm/swim
Stars	74	74	75
Language	Python	Python	Python
Setup difficulty	moderate	moderate	hard
Complexity	4/5	3/5	5/5
Audience	developer	researcher	researcher

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Requires ComfyUI plus the separate ComfyUI Viewer extension version 0.4.0 or higher already installed.

MIT license, free to use, modify, and distribute including for commercial projects.

So what is it?

This is an extension for ComfyUI, an AI image and video generation tool, that embeds a video editor called OpenReel directly inside the ComfyUI interface. The problem it solves is the awkward gap between AI generated video frames and final polished output: previously, you would generate frames in ComfyUI and then have to take them to a separate video editing application to add effects, transitions, text overlays, or trim clips. With this extension, that editing step happens inside the same workflow. The way it works is through a set of special ComfyUI nodes, which are building blocks you connect visually. You use Bundle nodes to package your generated video frames, images, or audio into a format the OpenReel editor understands. The workflow then pauses while you edit your video in the embedded OpenReel timeline, and once you click send to output, you run the workflow again and an Unpack node extracts the edited result back into frames and audio for further processing or saving. It supports a server side rendering engine using FFmpeg, a widely used video processing tool, for faster exports without browser limits. You would use this when building AI video generation pipelines in ComfyUI and wanting to refine the output with keyframe animation, effects, transitions, or text overlays without leaving the environment. It requires ComfyUI and the separate ComfyUI Viewer extension version 0.4.0 or higher already installed, and is written in Python.

Copy-paste prompts

Prompt 1

Set up a ComfyUI workflow that uses CV OpenReel Bundle Video and a pause node to edit generated frames in OpenReel.

Prompt 2

Explain how the pause and cancel-then-rerun pattern works to get an edited video out of CV OpenReel Unpack.

Prompt 3

How do I combine a bundled video, bundled images, and bundled audio using CV OpenReel Bundle Combine?

Prompt 4

Walk me through installing this extension into ComfyUI_Viewer's custom_nodes/extensions folder.

Frequently asked questions