OpenCV播放视频文件

1.cv2.VideoCapture

        主要用到该API:cv2.VideoCapture(filename)，filename输入视频文件路径，同时用到cv2.CAP_PROP_FPS获取视频的fps,以及cv2.CAP_PROP_FRAME_COUNT来获取视频总帧数。

        fps为视频每秒播放的帧数。视频时长=fNUMS/fps,即  总帧数/FPS。比如下面这个就是

457/29.42越等为15s.

代码如下：

import numpy as np
import cv2 

video = cv2.VideoCapture('sea.mp4')

# 获得码率及尺寸
fps = video.get(cv2.CAP_PROP_FPS)

size = (int(video.get(cv2.CAP_PROP_FRAME_WIDTH)),  int(video.get(cv2.CAP_PROP_FRAME_HEIGHT)))
fNUMS = video.get(cv2.CAP_PROP_FRAME_COUNT)
print(fps," ",fNUMS)  #打印结果29.4206008583691   457.0

#计算可得视频时长15s, 457 / 29.42

while success:
    success, frame = video.read()
    frame = cv2.resize(frame, (960, 540)) # 缩放
    cv2.imshow('windows', frame)  # 显示
    cv2.waitKey(int(1000 / int(fps)))  # 设置延迟时间
video.release()

现象：

视频时长如下：