输入视频路径获取视频长宽python opencv

在Python中，使用OpenCV库可以很容易地获取视频文件的长度（帧数）和每一帧的宽度和高度。以下是一个简单的例子：

import cv2

def get_video_info(video_path):
    # 读取视频
    cap = cv2.VideoCapture(video_path)

    # 检查是否成功打开
    if not cap.isOpened():
        print(f"无法打开视频文件: {video_path}")
        return None

    # 获取视频的基本信息
    width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))  # 帧宽
    height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))  # 帧高
    fps = cap.get(cv2.CAP_PROP_FPS)  # 帧率
    frame_count = int(cap.get(cv2.CAP_PROP_FRAME_COUNT))  # 总帧数

    # 关闭视频流
    cap.release()

    return width, height, fps, frame_count

# 示例
video_path = 'path_to_your_video.mp4'
width, height, fps, frames = get_video_info(video_path)
if width and height:
    print(f"Video Information: Width: {width}, Height: {height}, FPS: {fps}, Total Frames: {frames}")