video-summarizer

--- name: video-summarizer description: Extract keyframes and metadata from video files using ffmpeg scene detection. Use when you need to analyze, summarize, or extract scenes from a video file. --- # Video Summarizer Extracts scene keyframes and metadata from video files using ffmpeg's scene detection. ## When to use - User uploads/provides a video file and asks what's in it - You need to summarize a video's content by extracting keyframes - You want to know video metadata (duration, resolution, fps, scene count) ## Usage ```javascript const vs = require('./skills/video-summarizer'); // Basic usage const result = vs.summarize('/path/to/video.mp4'); console.log(result.scenes); // array of { time, frame } objects console.log(result.duration); // duration in seconds console.log(result.keyframeCount); // Custom scene sensitivity const detailed = vs.summarize('/path/to/video.mp4', { sceneThreshold: 0.3 }); // Lower threshold = more scenes detected // Custom output directory const custom = vs.summarize('/path/to/video.mp4', { outputDir: '/tmp/frames' }); ``` ## Options | Option | Default | Description | |--------|---------|-------------| | `sceneThreshold` | 0.4 | ffmpeg scene detection threshold (0.0-1.0, lower = more sensitive) | | `outputDir` | video directory | Where to save extracted keyframe images | ## Return Value ```json { "scenes": [ { "time": "0.00", "frame": "/path/to/frames/frame-00001.jpg" }, { "time": "12.34", "frame": "/path/to/frames/frame-00002.jpg" } ], "duration": 120.5, "width": 1920, "height": 1080, "fps": 23.98, "keyframeCount": 8 } ``` ## Requirements - ffmpeg must be installed and available in PATH - Tested with ffmpeg 6+ ## Scripts - `scripts/extract-frames.js` - CLI wrapper for standalone use - `node scripts/extract-frames.js <videoPath> [options]` ## Notes - Keyframes are saved as JPEG files next to the video in a `{filename}_keyframes/` directory - Scene detection uses ffmpeg's `select='gt(scene,{threshold})'` filter - Large videos may take time to process; the internal timeout is 120 seconds

存档时间线

版本索引永久保留；内容副本只保留最新 1 份，更早版本仅留索引与哈希（存档时间线的证据链不会因此断裂）。

下载存档内容副本