实现基于RTMP协议的iOS直播-DDLive

 包括AVCapture采集数据，H.264编解码(硬件)，AAC编解码，FLV封装与解析，RTMP推流和拉流。

from https://github.com/hello-david/DDLive

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https://github.com/hello-david/FFMpeg-GoProLive

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https://github.com/hello-david/PeriscopeLiveApi