Extract frames every 10 seconds from all Movie_F videos in the CARDV folder.

Sample frames from Movie_R dashcam videos, one frame every 15 seconds.

Create motion samples for all parking camera videos with 5-second intervals.

Extract representative frames from Movie_F and Movie_R for July 27-29, 2025.

{output_dir}/
├── INDEX.csv                                      # Comprehensive metadata
├── 20250727150654_052278A_F001_001000ms.jpg      # Frame 1 at 1s
├── 20250727150654_052278A_F002_011000ms.jpg      # Frame 2 at 11s
├── 20250727150654_052278A_F003_021000ms.jpg      # Frame 3 at 21s
└── ...

{YYYYMMDDHHMMSS}_{FILEIDA/B}_{POSITION}_{TIMESTAMP_MS}ms.jpg

Example: 20250727150654_052278A_F003_021000ms.jpg
         └─────┬─────┘ └──┬──┘  └┬┘   └───┬───┘
           Date/Time   FileID  Pos  Timestamp

Components:
- YYYYMMDDHHMMSS: Video start time
- FILEIDA/B: Camera file ID + suffix (A=front, B=rear)
- F###: Frame position (F001, F002, F003...)
- ######ms: Milliseconds into video

original_video,frame_file,camera,date,position,timestamp_ms,timestamp_s,frame_number,file_size_kb
20250727150654_052278A.MP4,20250727150654_052278A_F001_001000ms.jpg,Movie_F,20250727,F001,1000,1.0,24,1713.06

timestamps = []
current_time = 1.0  # start offset
while current_time < (duration - 1.0):
    timestamps.append(current_time)
    current_time += sample_interval
timestamps.append(duration - 1.0)  # always include end

SKIP: video.MP4 too short (2.1s)
ERROR: Cannot open corrupted_video.MP4
WARNING: Failed to read frame 120 from video.MP4

Use the motion-sampler skill to extract frames every 10 seconds from all Movie_F videos
in C:\Users\yousu\Desktop\CARDV. Save to MOTION_SAMPLES folder.

Extract frames every 5 seconds from Movie_R videos on July 27, 2025.

Create motion samples with 30-second intervals for all parking cameras (Park_F and Park_R)
to minimize storage while keeping a visual record.

G:\My Drive\PROJECTS\skills\motion-sampler\
├── skill.md                          # This file
├── README.md                         # Quick start guide
├── SKILL_MANIFEST.md                # File inventory & testing
├── scripts/
│   ├── extract_motion_samples.py    # Main extraction script
│   └── analyze_results.py           # Post-processing analysis
├── assets/
│   ├── config_template.json         # Default configuration
│   └── camera_mapping.json          # Camera ID mapping
└── references/
    ├── SAMPLING_ALGORITHM.md        # Detailed algorithm docs
    └── PERFORMANCE_BENCHMARKS.md    # Speed/storage benchmarks

{
  "camera": "Movie_F",
  "source_dir": "C:\\Users\\yousu\\Desktop\\CARDV",
  "output_dir": "C:\\Users\\yousu\\Desktop\\CARDV\\MOTION_SAMPLES",
  "sample_interval": 10.0,
  "jpeg_quality": 92,
  "max_workers": 4,
  "date_filter": null,
  "min_duration": 3.0,
  "use_nvdec": false
}

{
  "status": "success",
  "videos_processed": 2146,
  "frames_extracted": 15022,
  "total_size_mb": 26750.5,
  "avg_frames_per_video": 7.0,
  "processing_time_s": 305.2,
  "throughput_videos_per_sec": 7.03,
  "output_dir": "C:\\Users\\yousu\\Desktop\\CARDV\\MOTION_SAMPLES",
  "index_file": "C:\\Users\\yousu\\Desktop\\CARDV\\MOTION_SAMPLES\\INDEX.csv"
}