报错了，anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback

我用opencv打不开摄像头，出现了以下的报错，请问应该怎么去改，
[ WARN:1] global C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-inblc7p7\opencv\modules\videoio\src\cap_msmf.cpp (438) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback

我试过了以下两种放法都不可以
（1）cap = cv2.VideoCapture(0, cv2.CAP_DSHOW)
（2）windows 下：在命令行中输入：

setx OPENCV_VIDEOIO_PRIORITY_MSMF 0

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