# Core Features

## 1. Frame Extraction
- Extract from specific timecode (HH:MM:SS.ms) or frame number
- Output format options (PNG, JPG)

## 2. GPS Matching
- Parse SRT subtitle format
- Look up GPS at exact timecode match
- Error handling for missing coordinates

## 3. EXIF Writing
- Overwrite GPS coordinates in extracted frames
- Use exiftool (frames never have EXIF data)

## 4. Single Frame Extraction
- Extract one frame at specific timecode
- Return GPS with the frame

## 5. Batch Extraction
- Walk through entire MP4 at fixed intervals (e.g., every 500ms)
- Extract frames + match GPS at each interval
- Support time intervals from CLI or config

## 6. Batch Time List Extraction
- Extract multiple frames at specified timecodes
- Optionally load times from a file

## Additional Features

- Progress bar for long batch jobs
- Verify frame timestamps match SRT timestamps
- Logging/debugging mode
- Summary report (frames extracted, GPS match rate, errors)