修复了摄像头的bug

modified:   helloworld.py
	modified:   sub_windows/sub_window_8.py

helloworld.py

@@ -1,5 +1,4 @@
 import cv2
-
 def detect_cameras(max_cameras=10):
     cameras = []
     for i in range(max_cameras):
@@ -11,5 +10,7 @@ def detect_cameras(max_cameras=10):
             cap.release()
     return cameras
 
-available_cameras = detect_cameras()
-print(f'Found {len(available_cameras)} camera(s): {available_cameras}')
+# available_cameras = detect_cameras()
+# print(f'Found {len(available_cameras)} camera(s): {available_cameras}'
+
+print(cv2.__version__)

sub_windows/sub_window_8.py

@@ -59,7 +59,9 @@ class FaceDetect(QThread):
 
     def run(self):
         face_cascade = cv2.CascadeClassifier('./static/cascade.xml')
-        capture = cv2.VideoCapture(0)
+        capture = cv2.VideoCapture(0, cv2.CAP_DSHOW)
+        codec = cv2.VideoWriter_fourcc("M", "J", "P", "G")
+        capture.set(cv2.CAP_PROP_FOURCC, codec)
         while self.working:
             ret, frame_color = capture.read()
             (height, width, channels) = frame_color.shape