Video Edit

calesthio/OpenMontage/.agents/skills/video-edit

作者 calesthio9327439db69021ab4b0e2776729bf3b58fdb5a87無授權條款65K 個星標收錄於 2026年10月9日更新於 2026年10月9日儲存庫5 天前更新

Edit videos locally using ffmpeg. Trim, concat, resize, speed, overlay, extract audio, compress, and convert. Use when: (1) Trimming or cutting video segments, (2) Concatenating multiple clips, (3) Resizing video for social platforms, (4) Extracting or replacing audio, (5) Compressing video, (6) Converting video formats, (7) Getting video info.

僅含說明Design & Creative

AI 產生的概覽

使用 ffmpeg 指令在本機編輯影片，支援裁剪、串接、縮放、音訊與格式轉換。

功能: 此技能提供 ffmpeg 與 ffprobe 的本機影片編輯指令配方。涵蓋檢視影片中繼資料、裁剪片段、串接多個片段、依平台預設縮放與補邊、調整播放速度、擷取或取代音訊、壓縮、轉換格式，以及加入圖片疊加層。它會產出編輯後的影片或音訊檔案，並附上一份包含更詳細配方與參數說明的參考文件。
適用情境: 當你需要裁剪或串接影片片段、為社群平台調整影片尺寸、擷取或取代音軌、壓縮或轉換影片格式，或讀取影片資訊時使用。它適用於本機命令列影片編輯工作，前提是已安裝 ffmpeg。
執行需求: 需要在本機安裝 ffmpeg 與 ffprobe（例如透過 Homebrew 或 apt 安裝）。此技能不附包裝指令碼，僅包含說明文件與一份參考文件。

Video Edit

Edit videos locally by running ffmpeg/ffprobe directly. No wrapper scripts needed.

Prerequisites

Install ffmpeg (includes ffprobe):

bash

# macOSbrew install ffmpeg
# Ubuntu/Debiansudo apt update && sudo apt install -y ffmpeg
# Verifyffmpeg -version && ffprobe -version

# macOSbrew install ffmpeg
# Ubuntu/Debiansudo apt update && sudo apt install -y ffmpeg
# Verifyffmpeg -version && ffprobe -version

Quick Reference

Get video info

Trim

Concatenate clips

bash

# 1. Create a file listprintf "file '%s'\n" clip1.mp4 clip2.mp4 clip3.mp4 > list.txt
# 2. Concat with stream copyffmpeg -y -f concat -safe 0 -i list.txt -c copy joined.mp4

# 1. Create a file listprintf "file '%s'\n" clip1.mp4 clip2.mp4 clip3.mp4 > list.txt
# 2. Concat with stream copyffmpeg -y -f concat -safe 0 -i list.txt -c copy joined.mp4

Resize for platform

bash

ffmpeg -y -i video.mp4 \  -vf "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black" \  -c:a copy tiktok.mp4

ffmpeg -y -i video.mp4 \  -vf "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black" \  -c:a copy tiktok.mp4

Change speed

bash

# 2x fasterffmpeg -y -i video.mp4 -filter:v "setpts=0.5*PTS" -filter:a "atempo=2.0" fast.mp4
# 0.5x (slow motion)ffmpeg -y -i video.mp4 -filter:v "setpts=2.0*PTS" -filter:a "atempo=0.5" slow.mp4

# 2x fasterffmpeg -y -i video.mp4 -filter:v "setpts=0.5*PTS" -filter:a "atempo=2.0" fast.mp4
# 0.5x (slow motion)ffmpeg -y -i video.mp4 -filter:v "setpts=2.0*PTS" -filter:a "atempo=0.5" slow.mp4

Extract audio

Replace audio

Compress

Convert format

Add image overlay

bash

# Logo in top-right cornerffmpeg -y -i video.mp4 -i logo.png \  -filter_complex "overlay=W-w-10:10" -c:a copy watermarked.mp4

# Logo in top-right cornerffmpeg -y -i video.mp4 -i logo.png \  -filter_complex "overlay=W-w-10:10" -c:a copy watermarked.mp4

Platform Presets

Platform	Resolution	Scale + pad filter
TikTok	1080 x 1920	`scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black`
YouTube	1920 x 1080	`scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:black`
Instagram	1080 x 1350	`scale=1080:1350:force_original_aspect_ratio=decrease,pad=1080:1350:(ow-iw)/2:(oh-ih)/2:black`
Square	1080 x 1080	`scale=1080:1080:force_original_aspect_ratio=decrease,pad=1080:1080:(ow-iw)/2:(oh-ih)/2:black`
Twitter/X	1920 x 1080	`scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:black`

Use the filter with: ffmpeg -y -i input.mp4 -vf "<filter>" -c:a copy output.mp4

Tips

Always use -y to overwrite output without prompting.
Use -c copy when you only need to cut/join (no re-encoding, very fast).
Lower CRF = better quality, larger file. Range 18-28 is typical; 23 is the default.
For detailed recipes and flag explanations, see references/operations.md.

來源與署名

來源：calesthio/OpenMontage位於.agents/skills/video-edit提交9327439

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檢舉或申請下架

Video Edit

Video Edit

Prerequisites

Quick Reference

Get video info

Trim

Concatenate clips

Resize for platform

Change speed

Extract audio

Replace audio

Compress

Convert format

Add image overlay

Platform Presets

Tips

來源與署名

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