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https://blog.lcarbon.idv.tw/%e7%a8%8b%e5%bc%8f-%e7%94%a8-ffmpeg-%e6%8b%8d%e7%b8%ae%e6%99%82%e6%94%9d%e5%bd%b1mac/
[程式] 用 ffmpeg 拍縮時攝影(mac)