首先要上網抓別人編譯好的執行檔。
通常來說 Google 的第一個就是，不過我把我現在（Apr. 23th, 2015）找到的 Download FFmpeg 附一下好了。
Download FFmpeg -> Get the packages: Mac -> Static builds for OS X Intel 64-bit
NOTE: 不要抓錯抓到 “Builds 32-bit and 64-bit for OS X 10.5 and above” 的。同樣指令，我用這版會 build error，用上面那個不會。
在 http://evermeet.cx/ffmpeg/ 裡有 FFmpeg、 FFserver、 FFprobe、 FFplay 這幾個東西。只需要抓 FFmpeg 的即可。
”ffmpeg-71728-gba625dd.7z” 是 Trunk 版（最新版）。
”ffmpeg-2.6.2.7z” 是 Release/Tag 版（穩定版）。
我自己是抓 Release 版來用。把抓下來的 7z 檔解壓縮到 Downloads。
USER-MBP:~ user$ cd Downloads
USER-MBP:Downloads user$ ./ffmpeg -i Target\ File.flv Output.mp4就這樣。程式就會開始轉檔，轉好的檔案就會叫做 Output.mp4。「-i」是要設定輸入（要轉檔）的檔案名。因為副檔名是 mp4，所以程式會自動地用 mp4 的相關設定來轉檔，並用預設的參數來執行。
還有一些高級參數像是 -2-pass 等等的參數我也還沒開始研究（之前查文章有瞄到但沒有記下來）。
Mac 的 Batch/Shell script 我還沒開始研究。等研究好了我就不用怕轉檔啦！！！
會想要學這個來轉，一是因為很早以前就聽過這東西名字很多次，每次聽到人們都說這是神器，二來我想用 iMessage 傳影片給壞蛋姆，但是 iMessage 不接受我從網路上抓下來的 FLV，我又不想用很爛的企鵝（PEnGUIn Encoder MP4）來轉成 MP4。所以就導致我開始來研究這東西了。
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