video-watcher（视频观看者）

Video Analyzer

Analyze video files by extracting frames at 1-second intervals using ffmpeg, then examining the frames to understand the video content.

Prerequisites

Requires ffmpeg installed on the system. Install if missing:

# Ubuntu/Debian
sudo apt-get install -y ffmpeg

# macOS
brew install ffmpeg

Usage

Extract frames from video

scripts/extract_frames.sh <video_path> [output_dir] [fps]

Arguments:

• video_path (required): Path to the video file
• output_dir (optional): Directory for extracted frames. Default: creates frames_<video_name> in current directory
• fps (optional): Frames per second to extract. Default: 1 (one frame per second)

Example:

scripts/extract_frames.sh /path/to/video.mp4
scripts/extract_frames.sh /path/to/video.mp4 ./my_frames
scripts/extract_frames.sh /path/to/video.mp4 ./my_frames 2  # 2 frames per second

Output:

• Creates numbered frame images: frame_001.jpg, frame_002.jpg, etc.
• Prints video metadata (duration, resolution, frame count)

Workflow

1. Run extract_frames.sh on the video file
2. Read key frames using the read tool to view images
3. For comprehensive analysis, sample frames at regular intervals (e.g., every 5th frame)
4. Describe what you see in each frame to build understanding of the video

Tips

• For short videos (<1 min): Review all frames
• For medium videos (1-5 min): Sample every 3-5 frames
• For long videos (>5 min): Sample every 10+ frames, focus on scene changes
• Look for: scene transitions, text/titles, UI elements, actions, characters