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Development Guide

Prerequisites

  • Python 3.9+
  • FFmpeg (must be on PATH)
  • Adobe Premiere Pro (for CEP panel testing)

Backend Setup

# Clone and install in development mode
git clone https://github.com/SysAdminDoc/OpenCut.git
cd OpenCut
pip install -e ".[dev]"

# Install optional features as needed
pip install -e ".[standard]"  # Common deps (whisper, opencv, etc.)
pip install -e ".[ai]"       # AI tools (CPU)
pip install -e ".[ai-gpu]"   # AI tools (GPU with onnxruntime-gpu)
pip install -e ".[all]"      # Everything

# Run the server
python -m opencut.server
# Server starts on http://localhost:5679

CEP Extension Development

  1. Enable unsigned extensions by setting registry key:
    • Windows: HKCU\Software\Adobe\CSXS.XX\PlayerDebugMode = 1 (for each CC version)
    • macOS: defaults write com.adobe.CSXS.XX PlayerDebugMode 1
  2. The extension is at extension/com.opencut.panel/
  3. Remote debug at http://localhost:8842 (configured in .debug)
  4. Reload extension in Premiere: Window > Extensions > OpenCut

Project Structure

opencut/                    # Python backend
  server.py                 # Flask app, startup
  security.py               # CSRF, path validation, rate limiting
  jobs.py                   # Job state management
  helpers.py                # Shared utilities
  user_data.py              # Thread-safe file I/O
  routes/                   # Flask Blueprints
    system.py, audio.py, captions.py, video.py, jobs_routes.py, settings.py
extension/com.opencut.panel/ # CEP panel
  client/                   # HTML/CSS/JS frontend
  host/                     # ExtendScript (ES3 JSX)
  CSXS/manifest.xml         # Extension manifest

Building

Server Executable

pip install pyinstaller
pyinstaller opencut_server.spec
# Output: dist/OpenCut-Server/

Windows Installer

Requires Inno Setup 6 and ffmpeg/ffmpeg.exe + ffprobe.exe in project root.

iscc OpenCut.iss

Linting

ruff check opencut/
ruff format opencut/

Version Management

Version is defined in opencut/__init__.py and must match across 7+ files. Use the sync script to update all at once:

python scripts/sync_version.py --set 1.3.0

UXP Panel Development

The UXP panel at extension/com.opencut.uxp/ targets Premiere Pro 25.6+.

Setup

  1. Install Adobe UXP Developer Tool from the Creative Cloud app
  2. In UXP Developer Tool: Add Plugin → select extension/com.opencut.uxp/
  3. Click "Load" to sideload the panel into Premiere Pro
  4. The UXP panel connects to the same Python backend on port 5679

Key differences from CEP panel

  • Uses modern ES modules (import/export) — no ES3 restrictions
  • Direct fetch() API — no HTTP bridge needed
  • Timeline write-back uses premierepro UXP module (Premiere 25.6+)
  • CEP panel handles write-back for older versions

Manifests

  • CEP manifest: extension/com.opencut.panel/CSXS/manifest.xml
  • UXP manifest: extension/com.opencut.uxp/manifest.json
  • Both must be kept in sync for version numbers

New Optional Dependency Groups (v1.5.0+)

Install groups individually as needed:

# LLM features (chapters, NLP commands)
pip install openai>=1.0.0          # for OpenAI provider
pip install anthropic>=0.20.0      # for Anthropic provider
# Ollama: install from https://ollama.ai (no pip needed)

# Color matching (OpenCV required)
pip install opencv-python-headless>=4.8.0

# Auto-zoom face detection (OpenCV required)
pip install opencv-python-headless>=4.8.0

# Footage search (stdlib only — no pip required)

# Deliverables (stdlib csv only — no pip required)

# Loudness matching (FFmpeg required — external tool)
# Download from https://ffmpeg.org/download.html

Version Sync

When releasing a new version, update these files:

  • opencut/__init__.py — __version__
  • pyproject.toml — version
  • extension/com.opencut.panel/CSXS/manifest.xml — ExtensionBundleVersion and Version
  • extension/com.opencut.uxp/manifest.json — version
  • extension/com.opencut.uxp/main.js — VERSION constant
  • README.md — version badge
  • CHANGELOG.md — new section