So the issue is, everytime I close the window my video is showing on, it hangs and I have to force quit Python. I couldn’t figure out for the life of me what the heck was going on and finally, FINALLY after a million years of googling I realised…the code doesn’t work in Jupyter Notebook faints
In any case - thanks to a guy who raised that up and stopped my endless blind searching for solutions!!!!! I am now running the code in a .py file and it works!!
Follow the code below (credits to this guy: https://www.learnopencv.com/read-write-and-display-a-video-using-opencv-cpp-python/) if you want to record a live video. It opens the camera, records the video, closes the window when you press ‘q’, and saves the video in .avi format.
By the way, I am on macOS High Sierra 10.13.4, Python 3.6.5, OpenCV 3.4.1.
If you want to read a file instead, replace
cap = cv2.VideoCapture(0) with
cap = cv2.VideoCapture('yourfilename.avi').
import cv2 import numpy as np # Create a VideoCapture object cap = cv2.VideoCapture(0) # Check if camera opened successfully if (cap.isOpened() == False): print("Unable to read camera feed") # Default resolutions of the frame are obtained.The default resolutions are system dependent. # We convert the resolutions from float to integer. frame_width = int(cap.get(3)) frame_height = int(cap.get(4)) # Define the codec and create VideoWriter object.The output is stored in 'outpy.avi' file. out = cv2.VideoWriter('outpy.avi',cv2.VideoWriter_fourcc('M','J','P','G'), 10, (frame_width,frame_height)) while(True): ret, frame = cap.read() if ret == True: # Write the frame into the file 'output.avi' out.write(frame) # Display the resulting frame cv2.imshow('frame',frame) # Press Q on keyboard to stop recording if cv2.waitKey(1) & 0xFF == ord('q'): break # Break the loop else: break # When everything done, release the video capture and video write objects cap.release() out.release() # Closes all the frames cv2.destroyAllWindows()