ffmpeg -f avfoundation -i 1 -r 30 out.yuv
-f:指定使用avfoundation采集数据
-i：指定从哪儿采集数据，他是一个文件索引号
-r：指定帧率 25流畅 60高清
出现错误
[AVFoundation input device @ 0x7fdb77c15080] Invalid device index
1: Input/output error
通过下面的命令查看一下 mac 上都有哪些设备
ffmpeg -f avfoundation -list_devices true -i ""
[AVFoundation input device @ 0x7f8a3bc04100] AVFoundation video devices:
[AVFoundation input device @ 0x7f8a3bc04100] [0] Capture screen 0
[AVFoundation input device @ 0x7f8a3bc04100] AVFoundation audio devices:
[AVFoundation input device @ 0x7f8a3bc04100] [0] Microphone (Pink Rear)
[AVFoundation input device @ 0x7f8a3bc04100] [1] Microphone (Pink Front)
-i原来我的采集数据 0才是屏幕
ffmpeg录音命令
ffmpeg -f avfoundation -i :0 out.wav
:0 代表音频设备
