Update OpenCV Code to Prevent Program Crash

README.md

@@ -1,5 +1,7 @@
 # opencv-tutorial
 
+**Please note: This repository is now archived and will no longer be updated or maintained.**
+
 This is an introduction to object-oriented Programming (OOP) to OpenCV.
 
-Check-out the online documentation: https://opencv-tutorial.readthedocs.io
+Check-out the online documentation: https://opencv-tutorial.readthedocs.io

docs/intro/intro.rst

@@ -95,6 +95,8 @@ and then loop back. The loop finishes when **q** is pressed::
     while True:
         # Capture frame-by-frame
         ret, frame = cap.read()
+        if not ret:
+            break
 
         # Our operations on the frame come here
         gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
@@ -344,4 +346,4 @@ Mouse callback::
     cb(evt, x, y, flags, param)
 
     cv.createTrackbar('name', 'win', 0, max, cb)
-    cv.getTrackbarPos('name', 'win')
+    cv.getTrackbarPos('name', 'win')

docs/intro/intro2.py

@@ -6,6 +6,8 @@
 while True:
     # Capture frame-by-frame
     ret, frame = cap.read()
+    if not ret:
+        break
 
     # Our operations on the frame come here
     gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
@@ -17,4 +19,4 @@
 
 # When everything done, release the capture
 cap.release()
-cv.destroyAllWindows()
+cv.destroyAllWindows()