Nanoowl Container doesnt open camera

Robotics & Edge Computing Jetson Systems Jetson Orin Nano
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1

Hi, Im trying to follow the NanoOwl tutorial (NanoOWL - NVIDIA Jetson AI Lab) and getting some critical errors from Gstreamer.

First i was trying to use csi cameras (2 of them), than I saw in github repository instructions to use a USB camera. The 3 cameras are connected at the moment of the print bellow:

Screenshot from 2025-01-14 16-50-09
Screenshot from 2025-01-14 16-50-091296×741 148 KB

The server loads on http://0.0.0.0:7860/ but there is no feed from any cameras.

2

Hi kikoyah,

Looking at the code of tree_demo.py, it seems it is designed to take camera device ID like this.

With your already connected CSI camera, it is a little difficult to determine which is your USB web camera, but let’s say /dev/video2 is the one.

If that is the case, you can test with;

python3 tree_demo.py --camera 2 ../../data/owl_image_encoder_patch32.engine

Please let us know if this solves your issue.

3

Hi Cyato, thank you. It works with the usb camera.

Nanoowl github page is clear about using a USB camera, but can you point some direction/modification so it can work with csi cameras? When I try to run with other ids to use csi cameras, the difference in inicialization is the warnings above:

INFO:root:Opening camera.
[ WARN:0@16.220] global cap_gstreamer.cpp:2839 handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Internal data stream error.
[ WARN:0@16.221] global cap_gstreamer.cpp:1698 open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0@16.221] global cap_gstreamer.cpp:1173 isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created

4

Hi @kikoyah

It is great to hear it worked with your USB camera.

The tree_demo.py program just uses OpenCV to interface to a USB camera and does not support a CSI camera.

One thing you can try is to use the --csi2webcam option of jetson-containers, as explained in this tutorial.
https://www.jetson-ai-lab.com/lerobot.html#e-optional-csi-cameras

So that would be you run the container like;

jetson-containers run --csi2webcam --workdir /opt/nanoowl $(autotag nanoowl)

And inside the container, when you ls /dev/video* , you should see an additional device, so use that device id for as your camera.

5

Hi Cyato,

With the --csi2webcam option, the container requested additional libraries and after installation it worked.

Thanks for the quick support.