---

name: concat-mp4 description: Concatenate multiple MP4 files in order into a single MP4 using ffmpeg stream copy. dependencies:

• python>=3.11
• ffmpeg (cli tool)

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Concatenate MP4 Files

Join several .mp4 files in sequence without re-encoding (ffmpeg concat demuxer).

Run

Copy.venv/Scripts/python .claude/skills/concat_videos/scripts/concat_videos.py "output.mp4" "clip1.mp4" "clip2.mp4" "clip3.mp4"

Parameters

• Required: output (destination mp4), inputs (>=2 mp4 files, ordered)
• Optional: none

Example

Copy.venv/Scripts/python .claude/skills/concat_videos/scripts/concat_videos.py "./out/combined.mp4" "./out/part1.mp4" "./out/part2.mp4"