如何将最初来自电影的一系列图像转换为电影

Question

I have a set of jpg images. These images were originally taken from a movie. It was in C++ something like (I am explaining how I got these images for reference. This is not the main part of the question)

cv::Mat test_image;

cv::VideoCapture video_capture;
video_capture.open(test_video_name);
while(true){
  video_capture >> test_image;
  if (test_image.empty()) break;
  std::string input_file_name=get_file_name();
  cv::imwrite(input_file_name,test_image);
  }

Anyway, I got these images and I want to convert them back into a movie using Python

so I do

import cv2 as cv
import glob

glob_arg= image_folder+"/*.jpg"

size=getSize()
out = cv.VideoWriter(output_video,cv.VideoWriter_fourcc(*'DIVX'), 10, size)
for filename in sorted(glob.glob(glob_arg)):
    img = cv.imread(filename)
    print(filename)
    out.write(img)

out.release()

Now, my problem is in the VideoWriter problem, specifically the "10" parameter. How can I know what value to put there? This parameter is the number of frames per second. How can I determine it so as to have the same or similar movie as the original one?

Answer 1

In your C++ code, you can add this line under video_capture.open(test_video_name);to get the FPS of the video:

double fps = video.get(CAP_PROP_FPS);
std::cout << fps << std::endl;