video-edit

name

video-edit

description

Perform video editing operations using FFmpeg — cut clips, remove silence, burn captions, generate platform variants. USE THIS SKILL when the user wants to edit video files, extract clips, remove silent parts, add subtitles, or create social media versions. Trigger phrases include "cut video", "extract clip", "remove silence", "burn captions", "add subtitles", "generate variants", "TikTok version", "YouTube Shorts".

Video Editing Skill

This skill provides FFmpeg-based video editing tools for common operations:

1. Clip Extraction — Frame-accurate cutting
2. Silence Removal — Detect and trim silent regions
3. Caption Burning — Hard-code ASS/SRT subtitles
4. Platform Variants — Generate aspect ratio versions for social media

When to Use

Scenario	Tool
Cut a clip from video	extract_clip
Find silent parts	detect_silence
Remove dead air	remove_silence
Add burned-in subtitles	burn_captions
Create TikTok/YouTube/Instagram versions	generate_variants

Tools

extract_clip

Extract a clip with frame-accurate cutting.

Input:

• videoPath (string, required): Source video path
• start (number, required): Start time in seconds
• end (number, required): End time in seconds
• output (string, required): Output file path

Output: Confirmation with output path

detect_silence

Find silent regions in video audio.

Input:

• videoPath (string, required): Video file path
• threshold (string): Silence threshold (default: "-30dB")
• minDuration (number): Minimum silence duration in seconds (default: 0.5)

Output: JSON array of silent regions with start, end, duration

remove_silence

Remove all silent regions from video.

Input:

• videoPath (string, required): Video file path
• output (string, required): Output file path
• threshold (string): Silence threshold (default: "-30dB")
• minDuration (number): Minimum silence duration (default: 0.5)

Output: Confirmation with regions removed count and total time saved

burn_captions

Hard-code subtitles into video (ASS or SRT format).

Input:

• videoPath (string, required): Video file path
• captionsFile (string, required): Path to ASS/SRT caption file
• output (string, required): Output file path

Output: Confirmation with output path

generate_variants

Create platform-specific aspect ratio variants.

Input:

• videoPath (string, required): Video file path
• platforms (array, required): Target platforms — tiktok, youtube, instagram, linkedin, twitter
• outputDir (string, required): Output directory

Output: List of generated variant files

Aspect Ratios:

• TikTok: 9:16 portrait
• YouTube: 16:9 landscape, 9:16 shorts
• Instagram: 9:16 reels, 1:1 square, 4:5 feed
• LinkedIn: 16:9 landscape, 1:1 square
• Twitter: 16:9 landscape, 1:1 square

Examples

Extract a clip:

Cut from 10 seconds to 45 seconds of video.mp4

→ extract_clip with start: 10, end: 45

Remove silence:

Clean up the dead air in my recording

→ remove_silence

Create social media versions:

Generate TikTok and YouTube Shorts versions

→ generate_variants with platforms: ["tiktok", "youtube"]