我使用的是控制台ffmpeg，如果我从第一台显示器捕获，那么一切都很好
./ ffmpeg -video_size 640x480 -framerate 30 -f avfoundation -capture_cursor 1 -capture_mouse_clicks 1 -i 1：0 -c：v libx264 -qp 0 -preset ultrafast capture.mp4
如果从第二个监视器尝试捕获，则进程挂起
./ ffmpeg -video_size 640x480 -framerate 30 -f avfoundation -capture_cursor 1 -capture_mouse_clicks 1 -i 2：0 -c：v libx264 -qp 0 -preset ultrafast capture.mp4
我的设备清单：
AVFoundation input device @ 0x7fc74141a0c0] AVFoundation video devices:
[AVFoundation input device @ 0x7fc74141a0c0] [0] HD-camera FaceTime (integrated)
[AVFoundation input device @ 0x7fc74141a0c0] [1] Capture screen 0
[AVFoundation input device @ 0x7fc74141a0c0] [2] Capture screen 1
[AVFoundation input device @ 0x7fc74141a0c0] AVFoundation audio devices:
[AVFoundation input device @ 0x7fc74141a0c0] [0] Built-in Input
[AVFoundation input device @ 0x7fc74141a0c0] [1] Boom2Device
但是如果我将输出格式从mp4替换为mkv，那么记录在第二台显示器上也是如此！如何修复这个错误？