例如：
recvData, addr = recvSocket.recvfrom(400000)
imde = cv2.imdecode(recvData, 1)
错误，需改为
recvData, addr = recvSocket.recvfrom(400000)
recvData = np.frombuffer(recvData, dtype=np.uint8)
imde = cv2.imdecode(recvData, 1)
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