Features

1. Core Subtitle Extraction Features

• Hardcoded Subtitle Detection:
  • Free: Basic automatic detection of frames containing hardcoded subtitles (hardsub), with saving of timing position information for accurate subtitle synchronization.
  • Pro: Advanced automatic detection with improved accuracy, including support for low-contrast text, blurry text, and text on complex backgrounds. Also includes manual subtitle region selection for unusual text placement.
• Frame Capture & Background Removal:
  • Free: Capture of frames with hardcoded text and basic background removal to generate clean text images for OCR.
  • Pro: Advanced background removal with anti-interference enhancement, noise reduction, and text sharpening, ensuring clean text images even on complex or low-quality backgrounds.
• OCR Recognition:
  • Free: Basic OCR support for English and Simplified Chinese only, with accurate text recognition for clear, high-contrast text.
  • Pro: Full-language OCR support for 50+ languages, including English, Simplified Chinese, Traditional Chinese, Japanese, Korean, Spanish, French, German, Russian, Arabic, Portuguese, and more. Advanced OCR algorithms reduce errors and improve accuracy for blurry or low-resolution text.

2. Processing & Performance Features

• File Processing:
  • Free: Single-file processing only, with limits of 1 GB per file and 30 minutes per video.
  • Pro: Batch processing (unlimited number of videos at once) with no file size or video length limits. Support for all common video formats (MP4, AVI, MKV, MOV, WMV, etc.).
• GPU Acceleration:
  • Free: No GPU acceleration—processing is done via CPU only.
  • Pro: GPU hardware acceleration, which speeds up processing by 5–10 times compared to CPU-only processing, ideal for batch processing or large video files.
• Local Processing:
  • Free & Pro: All processing is done locally on your device—no cloud upload required. This ensures privacy, security, and faster processing (no internet dependency).

3. Subtitle Editing & Export Features

• Subtitle Editing:
  • Free: No editing features—subtitles are exported as-is.
  • Pro: Advanced subtitle editing tools, including timeline fine-tuning (adjust start/end times), subtitle merging/splitting, error correction dictionary (to fix common OCR errors), and text formatting (font, size, color).
• Export Formats:
  • Free: Export to SRT format only (the most common subtitle format, compatible with most video players).
  • Pro: Export to multiple formats, including SRT, ASS (advanced subtitle format with formatting support), VTT (for web videos), TXT (plain text), and XML (for professional use).
• Watermark:
  • Free: Small VisiSub logo watermark on all exported subtitles.
  • Pro: No watermarks on any exported subtitles.

4. User Interface & Usability Features

• GUI Interface:
  • Free & Pro: Intuitive, user-friendly GUI (Win32 for Windows, GTK+ for Linux) with simple navigation, making it easy for users of all skill levels to use the software.
• Multi-Language Interface:
  • Free & Pro: Support for English, Simplified Chinese, and Russian interfaces, with more languages coming in future updates.
• Progress Tracking:
  • Free & Pro: Real-time progress tracking for video processing, so you can see how much of the extraction process is complete.

5. Support & Update Features

• Support:
  • Free: Community forum support only (users can ask questions and share tips with other users).
  • Pro: Dedicated email support with 24-hour response time, ensuring that any issues or questions are resolved quickly.
• Updates:
  • Free: Basic updates (bug fixes, minor feature improvements) on a quarterly basis.
  • Pro: Priority updates (bug fixes, new features, language support expansions) on a monthly basis, with early access to new features before they are released to free users.

6. Commercial Use Features (Pro Only)

• Commercial use rights: Use VisiSub Pro for business purposes, including providing subtitle extraction services, integrating into commercial projects, and creating content for commercial distribution.
• Royalty-free use: No additional fees or royalties for using subtitles generated with VisiSub Pro in commercial projects.