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Error Domain=AVFoundationErrorDomain Code=-11800 "这项操作无法完成" UserInfo={NSLocalizedFailureReason=发生未知错误（560100710）, NSLocalizedDescription=这项操作无法完成, NSUnderlyingError=0x281ae41e0 {Error Domain=NSOSStatusErrorDomain Code=560100710 "(null)" UserInfo={AVErrorFourCharCode='!buf'}}} 奇怪的是有的视频可以，有的却不行
Error Domain=AVFoundationErrorDomain Code=-11800 "这项操作无法完成" UserInfo={NSLocalizedFailureReason=发生未知错误（560100710）, NSLocalizedDescription=这项操作无法完成, NSUnderlyingError=0x281ae41e0 {Error Domain=NSOSStatusErrorDomain Code=560100710 "(null)" UserInfo={AVErrorFourCharCode='!buf'}}}
奇怪的是有的视频可以，有的却不行