音声を抽出
for VIDEO in $(ls *.mp4 | sed 's/.mp4//')
do
ffmpeg -i ${VIDEO}.mp4 -acodec copy ${VIDEO}.aac
done
6秒の位置で320x240のサムネイルを取得
ffmpeg -i ${VIDEO}.mp4 -ss 6 -vframes 1 -f image2 -s 320x240 ${VIDEO}.jpg
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