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.

score 2 · Answer 1 · answered Feb 10 '17 at 20:01

2

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

answered Feb 10 '17 at 20:01

Mark Omo

898
2
12
26

I have a directory of images I want stuck into a single mp4, this just does it for one, and I asked for it in Python. – Teodorico Levoff Feb 10 '17 at 21:39
2

This method will do it for as many images as you want, and if you had bothered to do any research, you would have found this answer: http://stackoverflow.com/questions/14440400/creating-a-video-using-opencv-2-4-0-in-python – Mark Omo Feb 10 '17 at 22:26
Sorry, what does the 03d mean? – Teodorico Levoff Feb 15 '17 at 06:10
@TeodoricoLevoff 3 digit padded decimal, i.e. 001, 002 - 200, 201 - 998, 999 – Mark Omo Sep 04 '17 at 16:17

score 0 · Accepted Answer · answered Feb 13 '17 at 03:39

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()

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

2 Answers2