Help us understand the problem. What is going on with this article?

ffmpegで使うコマンド

ffmpegでよく使うコマンドをまとめていきたいと思います。

静止画切り出し

ffmpeg -i input.mp4 -r 1/30 -q:v 1 -f image2 %06d.jpg
オプション 内容
-i 入力ファイル
-r 1秒間に何枚切り出すか。1/30は30秒に1枚になる。
-f フォーマット
-q:v 画質 数字が大きくなると粗くなる

解像度変更

ffmpeg -i input.mp4 -vf scale=-1:1080 out.mp4
オプション 内容
-vf scale 画像解像度の指定 横×縦 -1とすることで元画像の比率で調整される。
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