基于开源项目的在线网络视频直播项目---pc端的推流
https://github.com/winlinvip/simple-rtmp-server/issues/66
https://github.com/justinmakaila/iOS-FrameEncoder/blob/master/libRTMPClient.m
https://github.com/winlinvip/simple-rtmp-server/wiki/Edge#hls%E8%BE%B9%E7%BC%98
https://github.com/wenjiegit/Bull-Live-Server
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