update 1

minor fix and also here FFMPEG file location for download  https://github.com/BtbN/FFmpeg-Builds/releases

Changes Made to the Code:

1. Subtitle Format Detection

• Added is_text_based_subtitle() function to distinguish text-based (SRT, ASS, SSA, WebVTT) from image-based (PGS, VobSub) subtitles
• Display warning [IMAGE - Cannot convert to SRT] for image-based formats in track list

2. Pre-Extraction Validation

• Check if selected track is text-based before attempting extraction
• Show warning if user selects image-based subtitle format

3. Better FFmpeg Error Handling

• Added CREATE_NO_WINDOW flag for Windows (hides console window)
• Better parsing of FFmpeg stderr output
• Verify output file exists and is not empty after extraction
• Specific error messages for common issues (corrupted tracks, unsupported codecs)

4. Optimized FFmpeg Commands

• Use -c:s copy for SRT files (faster, no conversion)
• Use -c:s srt only for other text formats (ASS, SSA, WebVTT)

5. Improved User Experience

• More detailed status messages showing text-based vs total subtitle count
• Better error messages with helpful suggestions
• Proper handling of JSON parsing errors from ffprobe

Key Fix: The main issue was using -c:s srt for all subtitle types, which fails for image-based subtitles (PGS, VobSub) that cannot be converted to text without OCR.