使用opencv进行视频写入，但输出文件不可播放

fourcc = cv2.VideoWriter_fourcc(*'mp4v')  # 使用MP4V编码器
out = cv2.VideoWriter('output.mp4', fourcc, 20.0, (640, 480))

out = cv2.VideoWriter('output.mp4', fourcc, 30.0, (1920, 1080))

out = cv2.VideoWriter('path/to/output.mp4', fourcc, 20.0, (640, 480))

while True:
    ret, frame = cap.read()
    if not ret:
        break
    out.write(frame)

pip install opencv-python-headless

import cv2

# 打开视频捕获设备
cap = cv2.VideoCapture(0)

# 获取视频的宽度和高度
width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))

# 定义编码器和输出文件
fourcc = cv2.VideoWriter_fourcc(*'mp4v')
out = cv2.VideoWriter('output.mp4', fourcc, 20.0, (width, height))

while True:
    ret, frame = cap.read()
    if not ret:
        break
    out.write(frame)

    # 显示视频帧
    cv2.imshow('frame', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# 释放资源
cap.release()
out.release()
cv2.destroyAllWindows()