xushuwenn/redact/ffmpeg-video-editing

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Cut, trim, concatenate, and split video files - basic video editing operations

Install

npx vskill@latest install xushuwenn/redact/ffmpeg-video-editing

SKILL.md

The same SKILL.md was published earlier as benchflow-ai/skillsbench-trajectories/ffmpeg-video-editing.

FFmpeg Video Editing Skill

Basic video editing operations: cutting, trimming, concatenating, and splitting videos.

When to Use

  • Cut segments from video
  • Trim video length
  • Concatenate multiple videos
  • Split video into parts
  • Extract specific time ranges

Cutting and Trimming

bash
# Cut from 10s to 30s (using -ss and -to)
ffmpeg -ss 00:00:10 -to 00:00:30 -i input.mp4 -c copy output.mp4
 
# Cut from 10s for 20 seconds duration
ffmpeg -ss 00:00:10 -t 20 -i input.mp4 -c copy output.mp4
 
# First 60 seconds
ffmpeg -t 60 -i input.mp4 -c copy output.mp4
 
# Last 30 seconds (need duration first)
ffmpeg -sseof -30 -i input.mp4 -c copy output.mp4

Precise Cutting

bash
# With re-encoding (more precise)
ffmpeg -ss 00:00:10 -i input.mp4 -t 20 -c:v libx264 -c:a aac output.mp4
 
# Keyframe-accurate (faster, may be less precise)
ffmpeg -ss 00:00:10 -i input.mp4 -t 20 -c copy output.mp4

Concatenation

Method 1: File List (Recommended)
bash
# Create list.txt file:
# file 'video1.mp4'
# file 'video2.mp4'
# file 'video3.mp4'
 
ffmpeg -f concat -safe 0 -i list.txt -c copy output.mp4
Method 2: Same Codec Files
bash
# If all videos have same codec/format
ffmpeg -i "concat:video1.mp4|video2.mp4|video3.mp4" -c copy output.mp4
Method 3: Re-encode (Different Codecs)
bash
# Re-encode for compatibility
ffmpeg -f concat -safe 0 -i list.txt -c:v libx264 -c:a aac output.mp4

Splitting Video

bash
# Split into 60-second segments
ffmpeg -i input.mp4 -c copy -f segment -segment_time 60 \
  -reset_timestamps 1 output_%03d.mp4
 
# Split at specific timestamps
ffmpeg -i input.mp4 -ss 00:00:00 -t 00:01:00 -c copy part1.mp4
ffmpeg -i input.mp4 -ss 00:01:00 -t 00:01:00 -c copy part2.mp4

Extract Segment with Re-encoding

bash
# When you need to change quality/codec
ffmpeg -ss 00:00:10 -i input.mp4 -t 20 \
  -c:v libx264 -crf 23 -c:a aac -b:a 192k output.mp4

Multiple Segments

bash
# Extract multiple segments
ffmpeg -i input.mp4 \
  -ss 00:00:10 -t 00:00:05 -c copy segment1.mp4 \
  -ss 00:01:00 -t 00:00:10 -c copy segment2.mp4

Notes

  • Use -c copy for speed (no re-encoding)
  • -ss before -i is faster but less precise
  • -ss after -i is more precise but slower
  • Concatenation requires same codec/format for -c copy
  • Use file list method for best concatenation results

Security

  • Security scanPassed, 90 of 100Pattern checks on the skill's files.
  • Model reviewPassed

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Source

Popularity

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