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FFmpeg commands for generating synthetic base test media files in test-data/. Use when creating test images, videos, or audio files before adding metadata with /use-exiftool-metadata.
Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.
SOC 직업 분류 기준
| name | use-ffmpeg-cli |
| description | FFmpeg commands for generating synthetic base test media files in test-data/. Use when creating test images, videos, or audio files before adding metadata with /use-exiftool-metadata. |
| disable-model-invocation | true |
| allowed-tools | Bash(ffmpeg *), Bash(ffprobe *) |
Invoke when generating base test files for app/core/src/test/resources/test-data/. FFmpeg creates the synthetic media files; ExifTool then adds metadata (see /use-exiftool-metadata).
brew install ffmpeg # macOS
# JPEG — specify exact dimensions (metadata tests check width/height)
ffmpeg -f lavfi -i color=c=blue:s=800x600 -frames:v 1 test_jpeg.jpg
ffmpeg -f lavfi -i color=c=black:s=1920x1080 -frames:v 1 test_jpeg_hd.jpg
# PNG
ffmpeg -f lavfi -i color=c=red:s=1280x720 -frames:v 1 test_png.png
# TIFF
ffmpeg -f lavfi -i color=c=green:s=640x480 -frames:v 1 test_tiff.tif
# BMP
ffmpeg -f lavfi -i color=c=white:s=320x240 -frames:v 1 test_bmp.bmp
# MP4 (5 seconds, black, H.264)
ffmpeg -f lavfi -i color=c=black:s=1280x720:r=30 \
-f lavfi -i anullsrc=r=48000:cl=stereo \
-c:v libx264 -pix_fmt yuv420p -c:a aac -t 5 test_mp4.mp4
# MOV (QuickTime)
ffmpeg -f lavfi -i color=c=black:s=1920x1080:r=24 \
-f lavfi -i anullsrc=r=44100:cl=stereo \
-c:v libx264 -pix_fmt yuv420p -c:a aac -t 5 test_mov.mov
# AVI (legacy format)
ffmpeg -f lavfi -i color=c=black:s=640x480:r=25 -t 5 test_avi.avi
# MP3 (10 seconds, 1kHz sine, stereo)
ffmpeg -f lavfi -i "sine=frequency=1000:duration=10" -c:a libmp3lame -b:a 128k test_mp3.mp3
# WAV (silent, 5 seconds)
ffmpeg -f lavfi -i anullsrc=r=44100:cl=stereo -t 5 test_wav.wav
# FLAC
ffmpeg -f lavfi -i anullsrc=r=44100:cl=stereo -t 5 test_flac.flac
# OGG
ffmpeg -f lavfi -i "sine=frequency=440:duration=5" -c:a libvorbis test_ogg.ogg
# M4A
ffmpeg -f lavfi -i anullsrc=r=44100:cl=stereo -t 5 -c:a aac test_m4a.m4a
Standard pattern (FFmpeg generates file, ExifTool adds metadata):
# 1. Generate base file
ffmpeg -f lavfi -i color=c=black:s=800x600 -frames:v 1 test_jpeg_with_date.jpg
# 2. Add metadata with ExifTool (see /use-exiftool-metadata)
exiftool -AllDates="2025:12:11 21:00:35" test_jpeg_with_date.jpg
exiftool -GPSLatitude=48.8584 -GPSLongitude=2.2945 -GPSLatitudeRef=N -GPSLongitudeRef=E test_jpeg_with_date.jpg
rm test_jpeg_with_date.jpg_original
# 3. Verify
exiftool -a -G1 -s test_jpeg_with_date.jpg
| Flag | Purpose | Example |
|---|---|---|
-f lavfi | Synthetic input source | -f lavfi -i color=c=black:s=800x600 |
-frames:v 1 | Single image frame | for still images |
-t | Duration in seconds | -t 5 |
-c:v libx264 | H.264 video codec | for MP4/MOV |
-pix_fmt yuv420p | Required for H.264 compat | always add with libx264 |
-c:a aac | AAC audio codec | for MP4/MOV |
-c copy | No re-encode | container change only |
-y | Overwrite without prompt | -y at start |
H.264 requires dimensions divisible by 2. Use even numbers (800x600, 1280x720, 1920x1080).
# If you need odd dimensions, pad with:
-vf "scale=trunc(iw/2)*2:trunc(ih/2)*2"
ffprobe -v quiet -print_format json -show_format -show_streams file.mp4
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