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Use FFmpeg to convert, process, and manipulate video and audio files from the terminal. Transcode formats, extract audio, create thumbnails, trim clips, and more.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
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| name | ffmpeg-cli |
| description | Use FFmpeg to convert, process, and manipulate video and audio files from the terminal. Transcode formats, extract audio, create thumbnails, trim clips, and more. |
The universal multimedia framework. Convert, process, and stream video and audio.
ffmpeg -i input.mp4 output.webm # Convert MP4 to WebM
ffmpeg -i input.mov output.mp4 # Convert MOV to MP4
ffmpeg -i input.wav output.mp3 # Convert WAV to MP3
ffmpeg -i input.mp4 -c:v libx264 -crf 23 output.mp4 # Re-encode with H.264
ffmpeg -i video.mp4 -vn -acodec mp3 audio.mp3 # Extract audio as MP3
ffmpeg -i video.mp4 -vn -acodec pcm_s16le audio.wav # Extract as WAV
ffmpeg -i video.mp4 -vn -c:a copy audio.aac # Extract without re-encoding
ffmpeg -i input.mp4 -ss 00:01:00 -to 00:02:00 -c copy clip.mp4 # Cut 1:00-2:00
ffmpeg -i input.mp4 -ss 30 -t 10 -c copy clip.mp4 # 10 seconds starting at 30s
ffmpeg -i input.mp4 -ss 00:00:05 -frames:v 1 thumb.png # Screenshot at 5s
ffmpeg -i input.mp4 -vf "fps=1/10" thumb_%04d.png # One frame every 10s
ffmpeg -i input.mp4 -vf "thumbnail" -frames:v 1 best_thumb.png # Best thumbnail
ffmpeg -i input.mp4 -vf "scale=1280:720" output.mp4 # Resize to 720p
ffmpeg -i input.mp4 -vf "scale=-1:480" output.mp4 # Scale height, keep ratio
ffmpeg -i input.mp4 -ss 0 -t 5 -vf "fps=10,scale=320:-1" output.gif
# Create file list: file 'clip1.mp4'\nfile 'clip2.mp4'
ffmpeg -f concat -safe 0 -i filelist.txt -c copy output.mp4
ffmpeg -i input.mp3 -af "volume=1.5" louder.mp3 # Increase volume
ffmpeg -i input.mp3 -af "atempo=1.5" faster.mp3 # Speed up audio
ffmpeg -i input.mp4 -an output_silent.mp4 # Remove audio
ffprobe -v quiet -print_format json -show_format -show_streams input.mp4
-c copy when possible to avoid re-encoding (much faster)ffprobe to inspect files before processing-y flag to overwrite output without prompting-hide_banner to reduce noisy output-preset ultrafast for quick encodes, -preset slow for quality/dev/null and use -progress pipe:1 for parseable progressffmpeg -y -hide_banner -i input.mov -c:v libx264 -crf 23 -preset medium -c:a aac -b:a 128k output.mp4
ffprobe -v quiet -show_entries format=duration -of csv=p=0 input.mp4