我如何使用keras来预测来自OpenCV的VideoCapture的预训练模型？

import cv2
from keras.models import load_model
from keras.preprocessing import image
import numpy as np

model = load_model('path_to_model.h5')

cap = cv2.VideoCapture('path_to_video.mp4')

while cap.isOpened():
    ret, frame = cap.read()
    if not ret:
        break
    
    # 对帧进行预处理
    frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
    frame = cv2.resize(frame, (224, 224))
    frame = image.img_to_array(frame)
    frame = np.expand_dims(frame, axis=0)
    frame = frame / 255.0
    
    # 进行预测
    prediction = model.predict(frame)
    # 根据预测结果进行相应的操作
    # ...

cap.release()
cv2.destroyAllWindows()