当我尝试使用FFmpeg访问网络摄像头时，Mac上出现了一个非常奇怪的问题。 例如：
ffmpeg -f avfoundation -i "1" -framerate 60 -vcodec libx264 -preset veryfast -f flv rtmp://localhost:1935/hls/test
无论我设置什么帧率，错误总是一样的。
[avfoundation @ 0x7ff831800000] Selected framerate (29.970030) is not supported by the device
[avfoundation @ 0x7ff831800000] Supported modes:
[avfoundation @ 0x7ff831800000] 320x240@[120.101366 120.101366]fps
[avfoundation @ 0x7ff831800000] 640x480@[120.101366 120.101366]fps
[avfoundation @ 0x7ff831800000] 800x600@[60.000240 60.000240]fps
[avfoundation @ 0x7ff831800000] 1024x768@[30.000030 30.000030]fps
[avfoundation @ 0x7ff831800000] 1280x720@[60.000240 60.000240]fps
[avfoundation @ 0x7ff831800000] 1280x1024@[30.000030 30.000030]fps
[avfoundation @ 0x7ff831800000] 1920x1080@[30.000030 30.000030]fps
[avfoundation @ 0x7ff831800000] 320x240@[30.000030 30.000030]fps
[avfoundation @ 0x7ff831800000] 640x480@[30.000030 30.000030]fps
[avfoundation @ 0x7ff831800000] 800x600@[20.000000 20.000000]fps
[avfoundation @ 0x7ff831800000] 1024x768@[6.000002 6.000002]fps
1: Input/output error
我已经搜索了很多天这个问题，但仍然无法找到任何解决方案。我现在很困惑。
我希望有人使用Mac可以尝试使用类似的命令访问网络摄像头，以查看这是否是一个常见问题。