视频加载失败===Error Domain=AVFoundationErrorDomain Code=-11821 "无法解码

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视频加载失败===Error Domain=AVFoundationErrorDomain Code=-11821 "无法解码" UserInfo={NSLocalizedFailureReason=媒体数据无法被解码，可能已损坏。, NSLocalizedDescription=无法解码, NSUnderlyingError=0x283da61f0 {Error Domain=NSOSStatusErrorDomain Code=-12911 "(null)"}}