iOS音视频知识和三方推荐

ZFPlayer
JPPlayer
VIMediaCache

[AVFoundation编程指南2-用AVPlayer播放视频]
https://segmentfault.com/a/1190000004054258

https://developer.apple.com/library/content/documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/02_Playback.html#//apple_ref/doc/uid/TP40010188-CH3-SW8