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Examples/opencv2-python/gstreamer/Example1/example1.py

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+# This script shows how to open a camera in OpenCV and grab frames and show these.
+# Kim S. Pedersen, 2022
+
+import cv2 # Import the OpenCV library
+
+
+def gstreamer_pipeline(capture_width=1024, capture_height=720, framerate=30):
+    """Utility function for setting parameters for the gstreamer camera pipeline"""
+    return (
+        "libcamerasrc !"
+        "video/x-raw, width=(int)%d, height=(int)%d, framerate=(fraction)%d/1 ! "
+        "videoconvert ! "
+        "appsink"
+        % (
+            capture_width,
+            capture_height,
+            framerate,
+        )
+    )
+
+
+print("OpenCV version = " + cv2.__version__)
+
+# Open a camera device for capturing
+cam = cv2.VideoCapture(gstreamer_pipeline(), apiPreference=cv2.CAP_GSTREAMER)
+
+
+if not cam.isOpened(): # Error
+    print("Could not open camera")
+    exit(-1)
+
+# Open a window
+WIN_RF = "Example 1"
+cv2.namedWindow(WIN_RF)
+cv2.moveWindow(WIN_RF, 100, 100)
+
+
+while cv2.waitKey(4) == -1: # Wait for a key pressed event
+    retval, frameReference = cam.read() # Read frame
+    
+    if not retval: # Error
+        print(" < < <  Game over!  > > > ")
+        exit(-1)
+    
+    # Show frames
+    cv2.imshow(WIN_RF, frameReference)
+    
+
+# Finished successfully