Python - Using OpenCV how to stick .png's into a single mp4?

Question

I have a directory of .png images that I want to stick into a single mp4? I am confident OpenCV can be used to do so, but I cannot find any resources on how exactly to? Any ideas? or tutorials?

Thanks.

Answer 1

The best way to do this would be with ffmpeg , you would do it like this:

ffmpeg -framerate 24 -i img%03d.png output.mp4

where:

• -framerate is your desired framerate (in fps)
• -i indicates that your images are formatted in the format img001.png , img002.png ect...
• and output.mp4 is the output file

More information here

Answer 2

You can use VideoWriter to first write your mp4 to a new file, and then write your images at the tail of this file, as shown:

import cv2
import cv
cap = cv2.VideoCapture("your_mp4.mp4")
ret,img=cap.read()
frame1=cv2.imread("your_img1.jpg")
frame2=cv2.imread("your_img2.jpg")
height , width , layers =  img.shape     
fps=20
video = cv2.VideoWriter("rec_out.avi", cv.CV_FOURCC(*'DIVX'), fps, (img.shape[1], img.shape[0]))
while True: 

    ret,img=cap.read()
    height , width , layers =  img.shape
        video.write(img)
    cv2.imshow('Video', img)
    video.write(img)
    if(cv2.waitKey(10) & 0xFF == ord('b')):
            break

#stick your images here
video.write(frame1)
video.write(frame2)
cv2.destroyAllWindows()
video.release()