I have 2 cameras (1 - Kayeton KYT-U200-R01 and 2 - similar one but for IR) running on my Raspberry Pi 3. Everything worked fine but suddenly after resolution has been changed from 640x480 to 1024x768 on both the second camera refused to work. The error I get switching over to the second camera is as follows:
cv2.error: /home/pi/opencv-3.4.0/modules/core/include/opencv2/core/mat.inl.hpp:500: error: (-215) total() == 0 || data != __null in function Mat
Even after restoring previous resolution and system reboot the second camera won't work. If someone came across this issue before, please write your solution, thanks in advance.
Here is my Python code:
Camera initialization
def init_cameras(self):
self.cap_1 = cv2.VideoCapture(1)
self.cap_1.set(cv2.CAP_PROP_FPS, 1)
# set resolution
self.cap_1.set(3, 640)
self.cap_1.set(4, 480)
self.cap_2 = cv2.VideoCapture(0)
self.cap_2.set(cv2.CAP_PROP_FPS, 1)
# set resolution
self.cap_2.set(3, 640)
self.cap_2.set(4, 480)
Frame reading
def get_img_frame_from_camera_two(self):
ret, img_frame = self.cap_2.read()
# to save it when 'capture' button will be clicked
self.save_last_img(img_frame)
qFormat = QtGui.QImage.Format_RGB888
img_frame = QtGui.QImage(img_frame, img_frame.shape[1], img_frame.shape[0], img_frame.strides[0], qFormat)
img_frame = img_frame.rgbSwapped()
return img_frame
Run method of separate thread to read the frame
def run(self):
while(True):
while(self.event_running.isSet()):
img_frame = self.camera_manager.get_img_frame_from_camera_two()
frame = {}
frame['img'] = img_frame
if self.camera_manager.queue_frames_camera_two.qsize() < 10:
# put frame to queue
self.camera_manager.queue_frames_camera_two.put(frame)
# notify listener on new frame added in
self.camera_manager.signal_camera_two.emit()
else:
print(self.camera_manager.queue_frames_camera_two.qsize())
