在读取视频文件调用默认的摄像头​​cv.VideoCapture(0)​​会出现下面的视频格式问题

CvCapture_MSMF::initStream Failed to set mediaType (stream 0, (640x480 @ 30) MFVideoFormat_RGB24(unsupported media type)

解决的方法:

调用参数：​​cv.CAP_DSHOW​​​​cv.VideoCapture(0 + cv.CAP_DSHOW)​​