python-2.7 - 视频Python的帧率

Question

代码:

    import cv2
    import numpy as np
    import sys
    import webcolors
    import time

    cam=cv2.VideoCapture('video2.avi')
    _, fo = cam.read()
    framei = cv2.cvtColor(fo, cv2.COLOR_BGR2GRAY)
    bg_avg = np.float32(framei)
    video_width = int(cam.get(3))
    video_height = int(cam.get(4))
    fr = int(cam.get(5))
    print("frame rate of stored video:::",fr)

    while(cam.isOpened): 
           f,img=cam.read()
           start_fps=time.time()
           .
           .
           .
           k = cv2.waitKey(20)
           if(k == 27):
               break
         endtime_fps=time.time()
         diff_fps=endtime_fps-start_fps
         print("Frame rate::",1/diff_fps)

每次迭代都会打印不同的帧率，例如:31.249936670193268、76.92300920661702、142.85290010558222、166.67212398172063、200.00495922941204、38.461 50460330851 ... 等一些值被重复了几次。现在存储视频的帧速率值为 25。那么读取它的实际帧速率是多少？

Answer 1

您可以使用以下代码获取 FPS(每秒帧数):

import cv2
cam = cv2.VideoCapture('video2.avi')
fps = cam.get(cv2.CAP_PROP_FPS)