ffmpeg
ffmpeg -f x11grab -r 25 -s 1366x768 -i :0.0 -sameq /tmp/out.mp4
avconv
avconv -f x11grab -r 25 -s 1366x768 -i :0.0 -same_quant /tmp/test.mp4
說明
f x11grab 從螢幕
-r 25 fps
-s 1366x768 解析度
-i :0.0 錄影的位置，可以用＋改變位置 ex. -i :0.0+10,20
-sameq & -same_quant 與來源使用相同的 quantizer，avconv 的 man page 說不等同於畫質
，只是不知道還有什麼方式來讓畫質變好 Orz
最後檔名為輸出的檔案，ctrl-c 停止錄影
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