mac下捕捉攝像頭
./ffmpeg -f avfoundation -framerate 30 -video_size 1280x720 -i "0:0" -vcodec libx264 -preset ultrafast -acodec libmp3lame -ar 44100 -ac 1 -f flv rtmp://127.0.0.1:1935/live/movie
參考
https://www.cnblogs.com/jackluo/p/7486239.html
https://www.jianshu.com/p/d9c66d7d1653
https://www.jianshu.com/p/4f399b9dfb43