FFmpeg CLI

SKILL.md

---
name: ffmpeg-cli
description: Comprehensive video/audio processing with FFmpeg. Use for: (1) Video transcoding and format conversion, (2) Cutting and merging clips, (3) Audio extraction and manipulation, (4) Thumbnail and GIF generation, (5) Resolution scaling and quality adjustment, (6) Adding subtitles or watermarks, (7) Speed adjustment (slow/fast motion), (8) Color correction and filters.
metadata: {"clawdbot":{"emoji":"🎬","requires":{"bins":["ffmpeg"]},"install":[{"id":"brew","kind":"brew","formula":"ffmpeg","bins":["ffmpeg"],"label":"Install ffmpeg (brew)"}]}}
---

# FFmpeg CLI

## Quick Reference

| Task | Command |
|------|---------|
| Cut video | `{baseDir}/scripts/cut.sh -i <input> -s <start> -e <end> -o <output>` |
| Merge clips | `{baseDir}/scripts/merge.sh -o <output> <file1> <file2> ...` |
| Extract audio | `{baseDir}/scripts/extract-audio.sh -i <video> -o <output.mp3>` |
| Generate thumbnail | `{baseDir}/scripts/thumb.sh -i <video> -t <timestamp> -o <out.jpg>` |
| Create GIF | `{baseDir}/scripts/gif.sh -i <video> -s <start> -e <end> -o <out.gif>` |
| Convert format | `{baseDir}/scripts/convert.sh -i <input> -o <output.mp4>` |
| Change speed | `{baseDir}/scripts/speed.sh -i <input> -r <0.5-2.0> -o <output>` |
| Add watermark | `{baseDir}/scripts/watermark.sh -i <video> -w <image> -o <output>` |

## Scripts

### cut.sh - Cut video segment
```bash
{baseDir}/scripts/cut.sh -i video.mp4 -s 00:01:30 -e 00:02:45 -o clip.mp4
```

### merge.sh - Concatenate videos
```bash
{baseDir}/scripts/merge.sh -o merged.mp4 part1.mp4 part2.mp4 part3.mp4
```

### extract-audio.sh - Pull audio track
```bash
{baseDir}/scripts/extract-audio.sh -i video.mp4 -o audio.mp3
```

### thumb.sh - Extract frame as image
```bash
{baseDir}/scripts/thumb.sh -i video.mp4 -t 00:00:15 -o frame.jpg
```

### gif.sh - Convert clip to GIF
```bash
{baseDir}/scripts/gif.sh -i video.mp4 -s 00:00:10 -e 00:00:15 -o clip.gif
```

### convert.sh - Transcode to new format
```bash
{baseDir}/scripts/convert.sh -i input.avi -o output.mp4
```

### speed.sh - Adjust playback speed
```bash
{baseDir}/scripts/speed.sh -i video.mp4 -r 2.0 -o fast.mp4  # 2x speed
{baseDir}/scripts/speed.sh -i video.mp4 -r 0.5 -o slow.mp4  # 0.5x speed
```

### watermark.sh - Overlay image watermark
```bash
{baseDir}/scripts/watermark.sh -i video.mp4 -w logo.png -o output.mp4
```

## Notes

- All scripts support common video formats (mp4, avi, mov, mkv, webm, etc.)
- Output quality is optimized for balanced file size and clarity
- Use `-h` or no args to see script usage