利用python-opencv读取视频，计算视频总帧数以及FPS

1、计算总帧数

import os
import cv2

video_cap = cv2.VideoCapture('ffmpeg_test.avi')

frame_count = 0
all_frames = []
while(True):
    ret, frame = video_cap.read()
    if ret is False:
        break
    all_frames.append(frame)
    frame_count = frame_count + 1

# The value below are both the number of frames
print frame_count
print len(all_frames)

2、计算视频中的FPS，即每秒传输帧数（Frames per second）

import cv2
if __name__ == '__main__' :

    video = cv2.VideoCapture("video.mp4");

    # Find OpenCV version
    (major_ver, minor_ver, subminor_ver) = (cv2.__version__).split('.')

    if int(major_ver)  < 3 :
        fps = video.get(cv2.cv.CV_CAP_PROP_FPS)
        print "Frames per second using video.get(cv2.cv.CV_CAP_PROP_FPS): {0}".format(fps)
    else :
        fps = video.get(cv2.CAP_PROP_FPS)
        print "Frames per second using video.get(cv2.CAP_PROP_FPS) : {0}".format(fps)

   video.release();