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Python – Writing to video with OpenCV

  • Last Updated : 17 Oct, 2021

In this article, we will discuss how to write to a video using OpenCV in Python.

Approach

  • Import the required libraries into the working space.
  • Read the video on which you have to write.

Syntax:

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cap = cv2.VideoCapture("path")
  • Create a output file using cv2.VideoWriter_fourcc() method

Syntax:



output = cv2.VideoWriter(“path”,cv2.VideoWriter_fourcc(*’MPEG’),30,(1080,1920))

  • Then edit the frames of the video by adding shapes to it (for the example given here, the same can be applied to any other technique.).

Syntax:

cv2.rectangle(frame, (100,100), (500,500), (0,255,0), 3)

  • Then write the video.

Syntax:

output.write(frame)

Example: Program to write to video

Video Used: 

Python




import cv2
  
  
def main():
    
    # reading the input
    cap = cv2.VideoCapture("input.mp4")
  
    output = cv2.VideoWriter(
        "output.avi", cv2.VideoWriter_fourcc(*'MPEG'), 30, (1080, 1920))
  
    while(True):
        ret, frame = cap.read()
        if(ret):
              
            # adding rectangle on each frame
            cv2.rectangle(frame, (100, 100), (500, 500), (0, 255, 0), 3)
              
            # writing the new frame in output
            output.write(frame)
            cv2.imshow("output", frame)
            if cv2.waitKey(1) & 0xFF == ord('s'):
                break
  
    cv2.destroyAllWindows()
    output.release()
    cap.release()
  
  
if __name__ == "__main__":
    main()

Output:




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