ffmpeg
https://qiita.com/yusuga/items/ba7b5c2cac3f2928f040
https://qiita.com/wMETAw/items/fdb754022aec1da88e6e
https://www.84kure.com/blog/2018/07/24/ffmpeg-動画を簡単に圧縮する-crfオプション/
ffmpeg 圧縮コマンド
ffmpeg -i input.mp4 -vcodec libx265 -crf 30 output.mp4
ffmpeg mp4 to gif
ffmpeg -i input.mp4 output.gif
#ffmpeg
#techtag