Python Opencv双摄像机源

我和opencv一起工作，有两个视频源。我正在使用以下代码。代码有时工作，有时不工作。我的代码有问题吗。我怎样才能弥补

import cv2

Channel0 = cv2.VideoCapture(0)
IsOpen0, Image0 = Channel0.read()
Channel1 = cv2.VideoCapture(1)
IsOpen1, Image1 = Channel1.read()

while IsOpen0 and IsOpen1:
    IsOpen0, Image0 = Channel0.read()
    IsOpen1, Image1 = Channel1.read()
    cv2.imshow("Webcamera",Image0)
    cv2.imshow("Panasonic",Image1)
    cv2.waitKey(10)

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PS当我只使用一个视频源时，它总是起作用。

我想我发现了我的错误。出于某种原因，下面的代码可以工作。一定是线程问题

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你能解释一下当它不起作用时它会做什么吗？

import thread
import time
import cv2


def Webcamera(): 
    Channel0 = cv2.VideoCapture(0)
    IsOpen0, Image0 = Channel0.read()
    while IsOpen0:
        IsOpen0, Image0 = Channel0.read()
        cv2.imshow("Webcamera",Image0)
        cv2.waitKey(10)
    if not IsOpen0:
        time.delay(0.5)
        print "Error opening Web camera"


def Panasonic():
    Channel1 = cv2.VideoCapture(1)
    IsOpen1, Image1 = Channel1.read()
    while IsOpen1:
        IsOpen1, Image1 = Channel1.read()
        cv2.imshow("Panasonic",Image1)
        cv2.waitKey(10)
    if not IsOpen1:
        time.sleep(0.5)
        print "Error opening Panasonic"

try:
   thread.start_new_thread(Webcamera,())
   thread.start_new_thread(Panasonic,())
except:
   print "Error: unable to start thread"

while 1:
   pass