Record command
MAC OS recording screen
ffmpeg -f avfoundation -i 1 -r 30 out.yuv
-f: 使用 avfoundation 采集数据
-i: 指定从哪采集数据，它的文件索引号0
-r: 指定的帧数
out.yuv 是最终采集下来的视频。 yuv格式原始数据
MAC OS to record sound
ffmpeg -f avfoundation -i :0 out.wav
:0 指的是声音的设备
macos system implementation with ffmpeg command recording screen and voice recording
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Origin www.cnblogs.com/fandx/p/12121072.html
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