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:
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:
