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The 30 means start extracting frames from 30 seconds into the video. The 3 means extract the next 3 seconds from that point. The fps can be adjusted based on your preferences. The 320 is the width of the gif, the height will be calculated automatically. input.mp4 is the video file, which can be any video file ffmpeg supports. The output.gif is the gif created. ffmpeg -ss 30 -t 3 -i input.mp4 -vf "
Unix Toolbox
This document is a collection of Unix/Linux/BSD commands and tasks which are useful for IT work or for advanced users. This is a practical guide with concise explanations, however the reader is supposed to know what s/he is doing. Unix Toolbox revision 14.5 The latest version of this document can be found at http://cb.vu/unixtoolbox.xhtml. Replace .xhtml on the link with .pdf for the PDF version a
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crontabコマンドの使い方: UNIX/Linuxの部屋
