在 OpenCV 上输入的更高分辨率视频文件的 fps 低

Question

I am trying to blur the faces using dlib face detector and open cv. The code works fine when giving input from a webcam but it gives low fps when I give 720p or 1080p video file as input. My end goal is to blur the faces when the video file with any resolution is given to the code.

I have tried reducing the frame size using "cap.set()".But it isn't working. Any help will be appreciated. output frame

Answer 1

Would it be possible to reduce the resolution of higher quality video if your code already works with lower resolution video? If so, then maybe you could try something like the following code from opencv.org :

import cv2
vidcap = cv2.VideoCapture('myvid2.mp4')
success,image = vidcap.read()
count = 0;
print "I am in success"
while success:
    success,image = vidcap.read()
    resized = cv2.resize(image, fx=0.5, fy=0.5, interpolation = cv2.INTER_LINEAR) 
    cv2.imwrite("%03d.jpg" % count, resize)     
    if cv2.waitKey(10) == 27:                     
        break
    count += 1

That should halve the resolution of the video. And you can reduce the resolution further by changing the 0.5 parameters in cv2.resize() to something even smaller.