Mp4 does not work for making videos out of frames but avi works-CodePudding

I am using the following code to create a movies out of pictures that I have and use the following code snippet:

import cv2
import os

image_folder = 'shots'
video_name = 'video.avi'
fps = 25

images = [img for img in os.listdir(image_folder) if img.endswith(".png")]

images = sorted(images)[:][:steps]

frame = cv2.imread(os.path.join(image_folder, images[0]))
height, width, layers = frame.shape

video = cv2.VideoWriter(video_name, 0, fps, (width, height))

for image in images:
  video.write(cv2.imread(os.path.join(image_folder, image)))

cv2.destroyAllWindows()
video.release()

The problem is that when I change the extension to mp4 it does not work. How can I alter my code so that I can get it to work? The reason for mp4 is the speed of the process which is very slow and I think it is because avi has more quality than mp4.

CodePudding user response：

In cv2.VideoWriter syntax have (filename, fourcc, fps, frameSize) these parametrs you are missing one parameter called fourcc (fourcc: 4-character code of codec used to compress the frames)

import cv2
import os

image_folder = 'shots'
video_name = 'video.mp4'
fps = 25

images = [img for img in os.listdir(image_folder) if img.endswith(".png")]

images = sorted(images)[:][:steps]

frame = cv2.imread(os.path.join(image_folder, images[0]))
height, width, layers = frame.shape

video = cv2.VideoWriter(video_name,cv2.VideoWriter_fourcc(*'MP4V'), fps, (width, height))

for image in images:
  video.write(cv2.imread(os.path.join(image_folder, image)))

cv2.destroyAllWindows()
video.release()