Stream class from VPI Python library missing constructor on Jetson Nano

[trav_245]

Howdy all,
I’m trying to get the Python example code for stereo disparity provided in the VPI documentation to work, but when I try to run it, I get:

    streamLeft = vpi.Stream()
TypeError: vpi.Stream: No constructor defined!

Note that this is on line 71 of the provided example code. I tried changing those lines to

streamLeft = vpi.Stream(0)

and

streamRight = vpi.Stream(1)

in case they needed identifiers, but it still didn’t work. I’m guessing I’m missing something here, or I need to update somehow (I have been using apt to update packages regularly).
I am using the Python 3.6 installation that comes with the NVIDIA Jetson Nano Ubuntu image.
Thanks in advance,
Travis

[DaneLLL]

Hi,
Please make sure you have two cameras connected and both can be launched in gst-launch-1.0 command:

$ gst-launch-1.0 nvarguscamerasrc sensor-id=0(or 1) ! nvoverlaysink

[trav_245]

Ahhhh, that was the issue. Thank you!