OpenCut v1.4.0 — Full Competitive Upgrade

What's New in v1.4.0

Major release: 74 bug fixes + 25 competitive upgrades across every feature area. OpenCut is now using cutting-edge 2025-2026 AI models throughout.

Bug Fixes (Batches 24-27 — 74 fixes)

• Batch 25 (25 fixes): Crash fix for batch denoise/normalize, rate limit slot leak on TooManyJobsError (4 routes), XSS via innerHTML, queue allowlist +15 endpoints, SSE CORS, CSS animation GPU optimization, MutationObserver leaks, event delegation, version sync expanded to 17 targets
• Batch 24 (20 fixes): styled_captions FFmpeg timeout/kill, animated_captions VideoWriter+fps guard, motion_graphics ffprobe+semicolon injection, color_management merged filters, style_transfer intensity clamp, installer Close button + path/disk validation
• Batch 26 (12 fixes): Dynamic button type (5 sites), ExtendScript project guards, showRecentClips race, ProcessKiller wmic→PowerShell CIM, job history delegation, captions rate limit async fix
• Batch 27 (17 fixes): MCP server path injection + CSRF refresh, SeamlessM4T per-segment OOM fix, transcript cache Segment attrs, BasicVSR++ missing weights error, ACE-Step result validation, queue allowlist +4, TTS engine allowlist, LUT blend size check, PySceneDetect start boundary

Phase 1 — Quick Wins

• Background removal default → BiRefNet — dramatically sharper edges
• Whisper default → Turbo — 6x faster transcription out of the box
• Distil-Whisper models — distil-large-v3.5 and distil-large-v3 (6x faster, 49% smaller)

Phase 2 — Dependency Upgrades

• Audio separation: python-audio-separator with Mel-Band RoFormer, BS-RoFormer, SCNet (Demucs archived)
• Speech enhancement: ClearerVoice-Studio (MossFormer2/FRCRN) — 48kHz, actively maintained
• Style transfer: Arbitrary style from ANY reference image via AdaIN color transfer
• Object removal: ProPainter video inpainting — temporally coherent
• Face enhancement: CodeFormer alongside GFPGAN — tunable fidelity slider
• Face detection: InsightFace buffalo_l — highest accuracy detector

Phase 3 — New Capabilities

• ACE-Step 1.5 music generation — full songs WITH vocals+lyrics, 10x faster, <4GB VRAM, Apache 2.0
• Chatterbox TTS + voice cloning — zero-shot from 5s audio, emotion control, 23 languages. Three-tier: edge-tts / Kokoro / Chatterbox
• PySceneDetect — fast heuristic scene detection
• SeamlessM4T v2 translation — 20% BLEU improvement, ~100 languages
• BasicVSR++ video denoising — GPU temporal propagation across frames
• NLP keyword auto-emphasis — TF-IDF frequency analysis for caption emphasis
• AI color grading — LAB perceptual percentile matching for LUT generation
• LUT blending — interpolate between any two .cube LUTs with a slider
• Remotion motion graphics — premium animated titles via React/Remotion CLI

Phase 4 — Architecture

• MCP server — 10-tool Model Context Protocol server for AI client integration (Claude Code, Cursor)
• Vision-augmented highlights — keyframe sampling + LLM analysis
• Transcript caching — transcribe once, reuse across all operations
• Version sync — sync_version.py covers 17 files

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Full Changelog: v1.3.1...v1.4.0

OpenCut v1.3.1

v1.3.1 — Bug Fix & Hardening Release

Systematic audit across 18 batches covering all backend, frontend, ExtendScript, and installer code. 200+ bugs fixed since v1.3.0.

Highlights

• Security: CSRF protection, path traversal prevention, FFmpeg filter injection hardening, pip install allowlists, SSRF guards
• Crash fixes: Null guards across frontend, FFmpeg filter syntax corrections, subprocess error handling, GPU memory cleanup
• Behavioral: Auto-crop reframe restored, workflow queue fix, batch file selection fix, health reconnection CSRF sync
• Code quality: Consolidated helpers, dead code removal, input validation caps, atomic file operations

Installation

Download OpenCut-Setup-1.3.1.exe and run. Includes server, FFmpeg, and CEP extension. Requires Adobe Premiere Pro CC 2019+.

OpenCut v1.3.0

What's New in v1.3.0

New Features

• UXP Bridge abstraction — wraps all jsx/csInterface calls for future CEP-to-UXP migration
• Speed-up-silence mode — speeds silent segments 1.5-8x instead of hard-cutting
• LLM abstraction (Ollama/OpenAI/Anthropic) — zero pip deps
• auto-editor integration — motion/audio-based editing via auto-editor CLI
• Resemble Enhance — speech super-resolution for low-quality audio
• TransNetV2 ML scene detection — neural network alternative to FFmpeg threshold filter
• MediaPipe face-tracking auto-framing — auto-crop for TikTok/Shorts/Reels
• LLM highlight extraction — ranked viral clip timestamps from transcript
• Video summarization — transcript-to-summary via LLM
• AI LUT generation — generate .cube LUTs from reference images
• One-click shorts pipeline — transcribe, highlight, reframe, caption, export
• LLM Configuration panel in Settings tab

UI Overhaul

• CapCut-style sidebar — 52px icon-only left sidebar replaces horizontal tabs
• Condensed media section for tighter vertical layout
• Fixed .btn-ghost dark theme styling for Recent button

Installer

• Optional Tools section — install auto-editor, edge-tts, mediapipe via pip during setup
• Frozen-build pip install now uses system Python from PATH
• System site-packages discovery for optional deps at runtime

Code Quality

• GPU detection caching, atomic file writes, queue thread safety
• XSS prevention, SSE cleanup, CSRF on all mutations
• Centralized dependency checks, error taxonomy, rate limiting
• 11 new backend routes, 6 new core modules

OpenCut v1.2.0

v1.2.0 — Major Feature Update

Zero-Dependency Installer

The installer now bundles everything — server, FFmpeg, and CEP extension. No Python, no FFmpeg, no manual setup. Just download, install, and go.

New Features (27 total)

• Waveform Preview: Visual waveform display on Silence tab with draggable threshold line synced to slider
• Side-by-Side Preview: Before/after frame comparison modal for video effects
• Dependency Health Dashboard: Grid view of all 24 optional dependencies with install status in Settings
• First-Run Wizard: Animated 3-step onboarding overlay for new users (dismissible, persisted)
• Output File Browser: Browse recent output files with Import-to-Premiere button
• Favorites Bar: Pin frequently-used operations as quick-access chips below the nav tabs
• Batch Multi-Select: Multi-file picker for batch operations (add selected, add all, clear)
• Parameter Tooltips: Hover tooltips on range sliders explaining what each parameter controls
• Custom Workflow Builder: Chain multiple operations into named reusable workflows
• Audio Preview Player: Floating audio player to preview generated audio before importing
• Settings Import/Export: Export all settings (presets, favorites, workflows) as JSON, import on another machine
• Right-Click Context Menu: Quick-action context menu on clip selector
• Collapsible Cards: Click card headers to collapse/expand dense form sections
• Job Time Estimates: Estimated processing time based on historical job data
• Video Reframe: Resize/crop video for TikTok, Shorts, Reels, Instagram, Square, or custom dimensions (crop/pad/stretch)
• Clip Preview Thumbnail: Visual thumbnail + duration/resolution metadata when selecting a clip
• Command Palette: Ctrl+K fuzzy search across 28+ operations with keyboard navigation
• Recent Clips: Dropdown of last 10 used clips, persisted across sessions
• Trim Tool: Set in/out points to extract a clip portion (stream copy or re-encode)
• Merge/Concatenate: Join multiple clips into one (fast stream copy or re-encoded for mixed formats)
• Auto-Crop Detect: Smart reframe anchor using FFmpeg cropdetect for talking-head content
• Audio Waveform Everywhere: Waveform preview on Denoise and Normalize tabs
• Per-Operation Presets: Save/load settings per operation to localStorage
• Server Health Monitor: 10-second heartbeat with reconnect banner
• Output Deduplication: Auto-increment suffix prevents overwriting previous outputs
• Localization Framework: Language selector placeholder for future i18n

Backend Improvements

• Bundled FFmpeg: Server auto-detects bundled FFmpeg directory at startup
• FFmpeg Progress Parsing: Real percentage updates via -progress pipe:1
• Subprocess Kill on Cancel: Job cancellation terminates running FFmpeg processes
• Temp File Cleanup: Stale preview files cleaned up on server startup
• File Serving Endpoint: GET /file for audio/video preview player
• 14 new API endpoints for waveform, preview, dependencies, outputs, favorites, workflows, settings, reframe, merge, trim, and time estimation

Bug Fixes

• Fixed _record_job_time() integration (missing _get_file_duration helper)
• Fixed fetchTimeEstimate() never being called on job start
• Fixed showAudioPreview() not triggering after audio generation
• Fixed audio preview using non-existent /file endpoint (now added)
• Fixed preview_frame() temp file leak on exception
• Optimized waveform peak extraction from O(n) per-sample to bulk array.frombytes()
• Fixed XSS via unescaped filenames in output browser
• Fixed wizard showing every session when dismissed without checkbox

Install

Download OpenCut-Setup-1.2.0.exe and run it. The installer handles everything automatically — no prerequisites needed.

OpenCut v1.0.0

OpenCut v1.0.0

Windows Installer

• One-click Inno Setup installer — installs backend, CEP extension, and Python dependencies automatically
• Desktop & Start Menu shortcuts with hidden-window server launcher
• Optional Windows startup entry for auto-launching the server
• Sets Adobe PlayerDebugMode registry keys (CSXS 7-12) for unsigned extension loading
• Full uninstall cleanup (CEP extension, logs, registry)

Critical Fix: CEP Manifest

• Added missing CSXS/manifest.xml — without this file, Premiere Pro could not discover or load the extension
• Targets Premiere Pro CC 2019+ (CSXS 9+)

Security Hardening

• Server no longer leaks internal exception details to clients — all 500 errors return a generic message while logging the real exception server-side via _safe_error() helper
• SSE CORS restricted from wildcard (*) to null origin
• Demucs model name whitelist prevents arbitrary model injection
• Whisper backend validation before subprocess execution
• Batch file count enforcement (MAX_BATCH_FILES) to prevent resource exhaustion
• Eliminated all bare except: clauses — replaced with specific exception types

UI & Accessibility

• Drag & drop zone for media file selection (click or drop)
• Theme quick toggle — switch between all 6 dark themes from a header dropdown without opening settings
• Job history panel — collapsible bar showing last 50 completed jobs with status indicators and timestamps
• Escape to cancel — press Escape during any active job to cancel it
• Skeleton loading — shimmer placeholders while file metadata loads
• ARIA live regions on status elements (role="status", role="alert")
• aria-current navigation tracking on active tabs
• Tooltips on icon-only buttons (alert dismiss, theme toggle)
• Fixed undefined CSS variables mapped to correct theme tokens
• Batch status null safety for partial server responses
• Responsive layout fixes for narrow panels (≤340px)

Housekeeping

• All version strings aligned to 1.0.0 across pyproject.toml, __init__.py, manifest.xml, and installer

Download

Run OpenCut-Setup-1.0.0.exe to install. Requires Python 3.9+ and Adobe Premiere Pro CC 2019+.

Initial release

v.0.0.5

beta

Opencut v1.0.0 beta

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