视频编辑器
video-editor
by cntuang
Video editing operations using ffmpeg. Use when user needs to: (1) Cut/trim video clips, (2) Merge/join multiple videos, (3) Convert video formats, (4) Extract audio from video, (5) Add subtitles or text overlays, (6) Adjust video speed, (7) Resize/crop video dimensions, (8) Apply filters or effects. Supports common formats like MP4, MOV, AVI, MKV, WebM.
安装
claude skill add --url github.com/openclaw/skills/tree/main/skills/cntuang/video-editor文档
Video Editor (ffmpeg)
Video editing operations for cutting, merging, converting, and processing video files.
Prerequisites
Requires ffmpeg and ffprobe installed:
brew install ffmpeg
Quick Start
Cut/Trim Video
Extract a segment from a video:
{baseDir}/scripts/cut.sh /path/to/input.mp4 --start 00:00:10 --end 00:00:30 --out /path/to/output.mp4
Or use duration instead of end time:
{baseDir}/scripts/cut.sh /path/to/input.mp4 --start 00:01:00 --duration 30 --out /path/to/output.mp4
Merge Videos
Concatenate multiple videos (must have same codec/resolution):
{baseDir}/scripts/merge.sh video1.mp4 video2.mp4 video3.mp4 --out merged.mp4
Convert Format
Convert between video formats:
{baseDir}/scripts/convert.sh input.mov --format mp4 --out output.mp4
Extract Audio
Extract audio track from video:
{baseDir}/scripts/extract-audio.sh input.mp4 --out audio.mp3
Add Subtitles
Burn subtitles into video:
{baseDir}/scripts/add-subtitles.sh input.mp4 subtitles.srt --out output.mp4
Resize Video
Change video resolution:
{baseDir}/scripts/resize.sh input.mp4 --width 1920 --height 1080 --out output.mp4
Or scale proportionally:
{baseDir}/scripts/resize.sh input.mp4 --scale 720 --out output.mp4
Adjust Speed
Speed up or slow down video:
{baseDir}/scripts/speed.sh input.mp4 --rate 2.0 --out output.mp4 # 2x faster
{baseDir}/scripts/speed.sh input.mp4 --rate 0.5 --out output.mp4 # 0.5x slower
Crop Video
Crop to specific region:
{baseDir}/scripts/crop.sh input.mp4 --x 100 --y 100 --width 800 --height 600 --out output.mp4
Common Workflows
Social Media Clip
Cut a segment and resize for Instagram/TikTok:
# First cut the segment
{baseDir}/scripts/cut.sh input.mp4 --start 00:00:15 --duration 15 --out clip.mp4
# Then resize to vertical format
{baseDir}/scripts/resize.sh clip.mp4 --width 1080 --height 1920 --out tiktok.mp4
Extract Highlights
Cut multiple segments and merge:
{baseDir}/scripts/cut.sh input.mp4 --start 00:00:10 --duration 5 --out highlight1.mp4
{baseDir}/scripts/cut.sh input.mp4 --start 00:01:30 --duration 5 --out highlight2.mp4
{baseDir}/scripts/merge.sh highlight1.mp4 highlight2.mp4 --out highlights.mp4
Add Background Music
Replace or mix audio:
# Replace audio
ffmpeg -i video.mp4 -i music.mp3 -c:v copy -map 0:v:0 -map 1:a:0 -shortest output.mp4
# Mix audio (video audio at 70%, music at 30%)
ffmpeg -i video.mp4 -i music.mp3 -filter_complex "[0:a]volume=0.7[a0];[1:a]volume=0.3[a1];[a0][a1]amix=inputs=2:duration=first" -c:v copy -shortest output.mp4
Tips
- Quality: Use
-crf 18for high quality,-crf 28for smaller files (default is 23) - Presets: Use
-preset slowfor better compression,-preset fastfor quicker encoding - Hardware acceleration: On Apple Silicon, add
-c:v h264_videotoolboxfor faster encoding - Copy mode: Use
-c copyto avoid re-encoding (much faster, but limited editing)
Troubleshooting
Merge fails with "Codec mismatch"
Videos must have the same codec, resolution, and frame rate. Re-encode them first:
ffmpeg -i input1.mp4 -c:v libx264 -c:a aac -vf "scale=1920:1080" -r 30 temp1.mp4
ffmpeg -i input2.mp4 -c:v libx264 -c:a aac -vf "scale=1920:1080" -r 30 temp2.mp4
{baseDir}/scripts/merge.sh temp1.mp4 temp2.mp4 --out merged.mp4
Subtitles not showing
Ensure subtitle file format matches extension (.srt, .ass, .vtt). Check encoding:
file -I subtitles.srt # Should show charset=utf-8
Convert if needed:
iconv -f GBK -t UTF-8 subtitles.srt > subtitles_utf8.srt
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