https://trac.ffmpeg.org/wiki/Capture/Desktop
官网教程

mac安装ffmpeg后，用命令行可以录屏。

1 获取mac的视频设备和音频设备

ffmpeg -f avfoundation -list_devices true -i ""

可以看到，视频设备有摄像头和显示器0/1，音频设备有麦克风

ffmpeg version 3.0 Copyright (c) 2000-2016 the FFmpeg developers
  built with Apple clang version 13.1.6 (clang-1316.0.21.2.3)
  configuration: --prefix=/usr/local/ffmpeg --enable-debug=3 --enable-shared
  libavutil      55. 17.103 / 55. 17.103
  libavcodec     57. 24.102 / 57. 24.102
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 31.100 /  6. 31.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
[AVFoundation input device @ 0x139615350] AVFoundation video devices:
[AVFoundation input device @ 0x139615350] [0] FaceTime HD Camera
[AVFoundation input device @ 0x139615350] [1] Capture screen 0
[AVFoundation input device @ 0x139615350] [2] Capture screen 1
[AVFoundation input device @ 0x139615350] AVFoundation audio devices:
[AVFoundation input device @ 0x139615350] [0] MacBook Pro麦克风
: Input/output error

2 开始录制

第一次录制前需要授权
ffmpeg -f avfoundation -i "0:0" output.mkv
格式不对还会报错，提示分辨率和帧率参数不对

[avfoundation @ 0x159808800] Selected framerate (29.970030) is not supported by the device
[avfoundation @ 0x159808800] Supported modes:
[avfoundation @ 0x159808800]   1280x720@[1.000000 30.000000]fps
[avfoundation @ 0x159808800]   640x480@[1.000000 30.000000]fps
0:0: Input/output error

如下设置之后就可以录制了，按ctrl+c可以停止录制
ffmpeg -video_size 1280x720 -framerate 30 -f avfoundation -i "0:0" output.mkv

输出视频文件是output.mkv，可以直接播放了。

3 ffplay播放

安装ffplay后，可以实时直接播放摄像头和话筒，把上面命令里的ffmpeg换成ffplay，去掉output.mkv输出文件就行了！

ffplay -video_size 1280x720 -framerate 30 -f avfoundation -i "0:0"

标签：ffmpeg,avfoundation,AVFoundation,mac,录屏,output,device,input,FFmpeg
来源： https://www.cnblogs.com/rome753/p/16491277.html