capturing-video-from-two-cameras-in-opencv-at-once
import cv2
import threading
class camThread(threading.Thread):
def __init__(self, previewName, camID):
threading.Thread.__init__(self)
self.previewName = previewName
self.camID = camID
def run(self):
print("Starting " + self.previewName)
camPreview(self.previewName, self.camID)
def camPreview(previewName, camID):
cv2.namedWindow(previewName)
cam = cv2.VideoCapture(camID)
if cam.isOpened():
rval, frame = cam.read()
else:
rval = False
while rval:
cv2.imshow(previewName, frame)
rval, frame = cam.read()
key = cv2.waitKey(20)
if key == 27: # exit on ESC
break
cv2.destroyWindow(previewName)
# Create threads as follows
thread1 = camThread("Camera 1", 0)
thread2 = camThread("Camera 2", 1)
thread3 = camThread("Camera 3", 2)
thread1.start()
thread2.start()
thread3.start()
print()
print("Active threads", threading.activeCount())