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ExifTool commands for embedding datetime and GPS metadata into test files in test-data/. Use when generating or modifying test file metadata.
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| name | use-exiftool-metadata |
| description | ExifTool commands for embedding datetime and GPS metadata into test files in test-data/. Use when generating or modifying test file metadata. |
| disable-model-invocation | true |
| allowed-tools | Bash(exiftool *) |
Invoke when generating or modifying test file metadata for app/core/src/test/resources/test-data/. Used to embed datetime, GPS, and EXIF data into test files so the metadata extraction tests have real metadata to verify.
See also: /use-ffmpeg-cli for generating the base test files before adding metadata.
brew install exiftool # macOS
| Tag | Purpose |
|---|---|
DateTimeOriginal | Capture date — the "Date Taken" — most important |
AllDates | Shortcut: sets DateTimeOriginal, CreateDate, ModifyDate at once |
FileModifyDate | Filesystem date — NOT the capture date |
YYYY:MM:DD HH:MM:SS
# With timezone:
YYYY:MM:DD HH:MM:SS±HH:MM
# Set all at once — preferred for test data
exiftool -AllDates="2025:12:11 21:00:35" test.jpg
# With timezone
exiftool -AllDates="2025:12:11 21:00:35+02:00" test.jpg
# Verify
exiftool -time:all -G1 -s test.jpg
# CRITICAL: always use -api QuickTimeUTC for videos
exiftool -api QuickTimeUTC -CreateDate="2025:12:11 21:00:35" test.mp4
exiftool -api QuickTimeUTC -ModifyDate="2025:12:11 21:00:35" test.mp4
# Verify
exiftool -time:all -G1 -s test.mp4
exiftool -AllDates+=1 test.jpg # Add 1 hour
exiftool -AllDates-=2:30 test.jpg # Subtract 2 hours 30 minutes
# Explicit (recommended)
exiftool -GPSLatitude=48.8584 -GPSLongitude=2.2945 -GPSLatitudeRef=N -GPSLongitudeRef=E test.jpg
# With altitude
exiftool -GPSLatitude=48.8584 -GPSLongitude=2.2945 \
-GPSLatitudeRef=N -GPSLongitudeRef=E \
-GPSAltitude=35 -GPSAltitudeRef=0 test.jpg
# Verify
exiftool -gps:all -G1 -s test.jpg
Coordinate convention:
exiftool -GPSCoordinates="48.8584, 2.2945, 35" test.mp4
exiftool -gps:all= test.jpg # Images
exiftool -GPSCoordinates= test.mp4 # Videos
Image dimensions are read from the actual pixel data — no need to set them manually. Generate files at the right size with FFmpeg:
# 800x600 image
ffmpeg -f lavfi -i color=c=blue:s=800x600 -frames:v 1 test_800x600.jpg
Standard pattern for creating a test file with full metadata:
# 1. Generate base file with FFmpeg
ffmpeg -f lavfi -i color=c=black:s=800x600 -frames:v 1 test_jpeg_with_date.jpg
# 2. Add datetime
exiftool -AllDates="2025:12:11 21:00:35" test_jpeg_with_date.jpg
# 3. Add GPS (optional)
exiftool -GPSLatitude=48.8584 -GPSLongitude=2.2945 -GPSLatitudeRef=N -GPSLongitudeRef=E test_jpeg_with_date.jpg
# 4. Remove backup created by exiftool
rm test_jpeg_with_date.jpg_original
# 5. Verify all metadata is correct
exiftool -a -G1 -s test_jpeg_with_date.jpg
| Format | DateTime | GPS | Notes |
|---|---|---|---|
| JPEG | Excellent R/W | Excellent R/W | Gold standard |
| PNG | Good R/W | Good R/W | Via XMP |
| HEIC/HEIF | Good R/W | Good R/W | Like MOV structure |
| TIFF | Excellent R/W | Excellent R/W | Full EXIF |
| MP4/MOV | Good R/W | Good R/W | Use -api QuickTimeUTC |
| AVI | Limited read | Poor | Legacy — avoid |
| BMP | None | None | Cannot write metadata |
# All JPEGs in test-data/
exiftool -AllDates="2025:12:11 21:00:35" -ext jpg app/core/src/test/resources/test-data/
# Multiple extensions
exiftool -AllDates="2025:12:11 21:00:35" -ext jpg -ext png -ext heic app/core/src/test/resources/test-data/
# Recursive
exiftool -r -AllDates="2025:12:11 21:00:35" -ext jpg app/core/src/test/resources/test-data/
# Creates test_no_meta.jpg without touching original
exiftool -all= -o test_no_meta.jpg test.jpg
# Verify it's clean
exiftool test_no_meta.jpg
ExifTool creates filename_original backups by default. Remove with:
exiftool -overwrite_original [command] file
Or clean up manually:
rm app/core/src/test/resources/test-data/*_original