What's 0xFF for in cv2.waitKey(1)?
It is also important to note that ord('q') can return different numbers if you have NumLock activated (maybe it is also happening with other keys). For example, when pressing c, the code:
key = cv2.waitKey(10) print(key)
returns
1048675 when NumLock is activated 99 otherwise
Converting these 2 numbers to binary we can see:
1048675 = 10000000000000110001199 = 1100011
As we can see, the last byte is identical. Then it is necessary to take just this last byte as the rest is caused because of the state of NumLock. Thus, we perform:
key = cv2.waitKey(33) & 0b11111111 # 0b11111111 is equivalent to 0xFF
and the value of key will remain the same and now we can compare it with any key we would like such as your question
if key == ord('q'):