检测视频中的媒体分辨率变化

Question

我尝试在SO中搜索，但无法找到。我想逐帧迭代视频文件，并想检测是否有任何点，当两个连续帧的分辨率变化。伪代码中期望的功能:

resolution1 = videoFile[0]->resolution
resolution2 = 0;
for frame in videoFile[1:]:
    resolution2 = frame->resolution
    if (resolution1 != resolution2):
        print 'Changes occured'
    else:
        resolution1 = resolution2

请给我一个库的名字来实现它们，我已经尝试并阅读了OpenCV和PiCamera的文档。提前感谢

Answer 1

你应该使用OpenCV来遍历每一帧。当视频改变分辨率时，应该打印"Changes occurred":

import cv2
capture1 = cv2.VideoCapture('videoname') #Open the video
ret, frame = capture1.read() #Read the first frame
resolution1 = frame.shape #Get resolution
while capture1.isOpened():
    ret, frame = capture1.read() #Read the next frame
    if ret == False or frame == None:
        break #Quit if video ends
    resolution2 = frame.shape #Get the new resolution
    if resolution1 != resolution2:
        print 'Changes occured'
        #Change resolution1 to resolution2 so that the new resolutions are
        #compared with resolution2, not resolution1.
        resolution1 = resolution2