如何在视频中创建2个叠加层？

使用Python的OpenCV库可以轻松地在视频中添加多个叠加层。以下是代码示例：

import cv2

# 加载视频
video = cv2.VideoCapture("input/video.mp4")

# 加载第一个叠加层
overlay1 = cv2.imread("input/overlay1.png", cv2.IMREAD_UNCHANGED)

# 加载第二个叠加层
overlay2 = cv2.imread("input/overlay2.png", cv2.IMREAD_UNCHANGED)

# 定义透明度
alpha = 0.5

while True:
    # 读取帧
    ret, frame = video.read()
    
    if not ret:
        break
    
    # 调整第一个叠加层的大小并进行透明度混合
    resized_overlay1 = cv2.resize(overlay1, (frame.shape[1], frame.shape[0]))
    overlay1_alpha = resized_overlay1[:, :, 3] / 255.0
    overlay1_alpha = cv2.merge((overlay1_alpha, overlay1_alpha, overlay1_alpha))
    overlay1_rgb = resized_overlay1[:, :, :3]
    overlay1 = cv2.multiply(overlay1_alpha, overlay1_rgb)
    frame = cv2.multiply(1.0 - alpha, frame) + cv2.multiply(alpha, overlay1)
    
    # 调整第二个叠加层的大小并进行透明度混合
    resized_overlay2 = cv2.resize(overlay2, (frame.shape[1], frame.shape[0]))
    overlay2_alpha = resized_overlay2[:, :, 3] / 255.0
    overlay2_alpha = cv2.merge((overlay2_alpha, overlay2_alpha, overlay2_alpha))
    overlay2_rgb = resized_overlay2[:, :, :3]
    overlay2 = cv2.multiply(overlay2_alpha, overlay2_rgb)
    frame = cv2.multiply(1.0 - alpha, frame) + cv2.multiply(alpha, overlay2)
    
    # 显示帧
    cv2.imshow("Frame", frame)
    
    # 退出键
    if cv2.waitKey(