Program is not terminating

Ajitverma1503 · March 20, 2020, 7:26pm

window is closed after pressing q but the program is not terminating.
here is the code : https://ide.codingblocks.com/s/194695

S18CRX0120 · March 20, 2020, 8:25pm

Hey @Ajitverma1503, just change the following line and than your code will run fine,
key_pressed = cv2.waitKey(1) & 0xFF (line 21)

Hope this cleared your doubt.
Plz close the doubt if you find that its resolved

Ajitverma1503 · March 21, 2020, 5:12am

I have also try this but it show the same problem.

S18CRX0120 · March 21, 2020, 5:23am

You may need to press q 2-3 times conitnuously to exit. I copied your code on my system and ran the same, it closes the window and code is also terminated. The error may be due to some local system error. Try running the complete code in jupyter notebook. Make sure to put all these in one single cell.

Hope this resolved your doubt.

Ajitverma1503 · March 21, 2020, 5:55am

This problem is occurring ever time in command prompt I think destroy all window function is not working properly.suggest me something the I do to terminate the program

S18CRX0120 · March 21, 2020, 6:41am

Try reversing the order

cv2.destroyAllWindows()
cap.release()
print(“Done here”)

And see if “Done here” is printed on the terminal or, not. If destroyAllWindows() didn’t work than you will not see the printed message. Also try running this code,

github.com

coding-blocks-archives/machine-learning-online-2018/blob/master/6. Project - Face Recognition/OpenCV Basics/cv_video_read.py

# Read a Video Stream from Camera(Frame by Frame)
import cv2

cap = cv2.VideoCapture(0)

while True:
	ret,frame = cap.read()

	if ret == False:
		continue

	cv2.imshow("Video Frame",frame)

	#Wait for user input - q, then you will stop the loop
	key_pressed = cv2.waitKey(1) & 0xFF
	if key_pressed == ord('q'):
		break

cap.release()
cv2.destroyALlWindows()

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Ajitverma1503 · March 21, 2020, 2:13pm

print function after destroyallwindow is executing. The code you provided is working fine but for the code face_detect program is not terminating.

S18CRX0120 · March 21, 2020, 2:49pm

If print statement is seen, than there is no problem with the code, Try adding exit() at end of code. Also you can hard exit the terminal, ctrl+z for ubuntu and ctrl+ c for the windows. If that also don’t work than there is no choice but to close the terminal directly.

Ajitverma1503 · March 21, 2020, 3:09pm

ctrl+c and exit() both are also not working i have tried it lots of time.Can you please tell why this problem is occuring when i use haarcasade file ?

S18CRX0120 · March 21, 2020, 5:53pm

There is no such error with the haarcascade file. This problem is due to some problem on your local system.
The only way out is to close the terminal directly. No other way is possible.

Ajitverma1503 · March 21, 2020, 6:35pm

okay then, i will check…
Thank you for the help

S18CRX0120 · March 25, 2020, 8:52am

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