Astra can't recognized in linux

[lio800206]

1. I have two devices, astra and Astra Stereo S U3
   Astra Stereo S U3 can detect video devices ls / dev /,but Astra cannot
   So I can't use cv2.VideoCapture(0) to open camera streaming Color image
   Error:
   VIDEOIO ERROR: V4L: can't open camera by index 0
   

   

2. If I use Astra Stereo S U3 and openni
   Error:
   raise OpenNIError(res, msg.strip(), logfile)
   openni.utils.OpenNIError: (OniStatus.ONI_STATUS_ERROR, '', None)

3. Is it possible to stream color and depth images at same time using openni in Python?
   If using astra and openni I can already get color and depth frames and depth stream

[asifkhan]

Run the following command and notice the cameras and indices:
v4l2-ctl --list-devices

Using Python, OpenNi2 and OpenCV you can stream color and depth simultaneously from Astra Stereo S.

At the moment I find some problem in synchronizing depth and color stream. I don't know how to synchronize depth frame capture using OpneNi and RGB frame captured using OpenCV.