Video Subtitle Remover Pro v3.5.0

Video Subtitle Remover Pro v3.5.0

Full rewrite from v2.0: real AI inpainting, multi-engine detection, professional DPI-responsive GUI, 20+ bug fixes.

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AI Inpainting Engine

• Real LaMa neural inpainting via simple-lama-inpainting -- dramatically better quality than OpenCV
• STTN and ProPainter modes available with OpenCV inpainting fallback
• Image output quality preserved per-format (JPEG 95%, PNG compression 3, WebP 95%)

Multi-Engine Text Detection

• Automatic fallback chain: PaddleOCR > EasyOCR > OpenCV
• 12 languages: English, Chinese, Japanese, Korean, French, German, Spanish, Portuguese, Russian, Arabic, Hindi, Italian
• EasyOCR language code mapping for cross-engine compatibility
• Adjustable detection threshold (10-90%) in Advanced Settings
• Improved OpenCV fallback: dual-threshold bright/dark text detection with morphological merge

Professional GUI

• DPI-responsive layout -- Per-Monitor DPI V2, proportional grid columns, all widgets resize dynamically
• Unified panel design -- Input and Settings merged with subtle divider, no cluttered borders
• Dark-themed throughout -- combobox dropdowns, scrollbars, label frames, scale sliders all properly themed
• Subtitle region selector -- draw a rectangle on the first frame to define the target area
• Detection mask preview -- right-click queue item to visualize detected text regions
• Before/after comparison -- click completed items for side-by-side preview
• Video time-range -- process only a segment (start/end seconds)
• Folder input -- drag-drop folders or right-click drop zone to browse folders
• Batch progress bar with window title progress indicator
• Collapsible log panel with color-coded output and Open Log File button
• CRF quality slider in Advanced Settings
• Tooltips on key controls with full-path tooltips on filenames
• Retry Failed button to re-queue failed/cancelled items
• Double-click completed item opens the output file
• Taskbar flash + sound on batch completion
• Settings lock during processing
• Custom output directory with Browse/Reset
• Queue capped at 500 items
• Clean, professional spacing at any resolution from 900x650 to 4K

Settings & Persistence

• All settings saved to %APPDATA%\VideoSubtitleRemoverPro\settings.json
• Subtitle region, language, threshold, CRF quality, GPU selection all persist
• Crash logging to rotating log file (5MB) + MessageBox on fatal error

CLI

python -m backend.processor -i input.mp4 -o output.mp4 -m lama --lang en --crf 20 --threshold 0.4 --start 30 --end 120

Flags: --mode, --gpu, --lang, --crf, --threshold, --start, --end, --skip-detection, --fast, --no-audio

Infrastructure

• GitHub Actions CI/CD workflow for automated Windows builds
• .gitignore for model weights, venv, build artifacts
• setup.py auto-installs EasyOCR + simple-lama-inpainting + PaddleOCR
• All source files pure ASCII (zero unicode characters)
• Branch protection enabled on main

Bug Fixes (20+)

• Processing was simulated, never called real backend
• Backend path pointed to nonexistent file
• InpaintMode enum mismatch between GUI and backend
• Race conditions in queue mutations during processing
• Widget destruction during processing broke progress updates
• GPU selection never synced to config
• Duplicate files could be queued
• Output files silently overwritten (now auto-increments)
• Cancel only marked one item, remaining abandoned (now marks all)
• Elapsed timer dict iteration crash
• Settings lock disabled entire widget tree (now scoped)
• Closing window during processing left orphan threads
• nvidia-smi crash on malformed output
• EasyOCR language code mismatch (ch vs ch_sim)
• FFmpeg subprocess deadlock (added 10min timeout)
• Subtitle area not persisted in settings
• ModernButton fired on release outside bounds
• Region selector VideoCapture resource leak
• Division by zero on 0-frame video containers
• Batch progress bar stuck at 100% after completion
• Eager output directory creation (deferred to processing)

v2.0

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