depthai: [BUG] Jetson Nano 4GB - depthai_demo.py error - qt.qpa.plugin: Could not load the Qt platform plugin "xcb"

Describe the bug Hey all, I’m hitting a wall! I’ve been troubleshooting this issue for 20-25 hours or so. When I install depthai using the instructions linked here for my Nvidia Jetson Nano 4GB and run the following code

python3 depthai_demo.py

I get the error / output below

khalid@khalidjetson:~/Luxonis/depthai$ python3 depthai_demo.py
Using depthai module from:  /home/khalid/.local/lib/python3.10/site-packages/depthai.cpython-310-aarch64-linux-gnu.so
Depthai version installed:  2.21.2.0
Setting up demo...
Available devices:
[0] 18443010F1AA721200 [X_LINK_UNBOOTED]
USB Connection speed: UsbSpeed.SUPER
Downloading /home/khalid/.cache/blobconverter/mobilenet-ssd_openvino_2021.4_6shave.blob...
[==================================================]
Done
qt.qpa.xcb: could not connect to display 
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/home/khalid/.local/lib/python3.10/site-packages/cv2/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb.

Aborted (core dumped)

I’ve also tried installing depthai manually using the doc linked here and I still get the same above error.

Minimal Reproducible Example

Append the MRE to the bug report, [instructions here] (https://docs.luxonis.com/en/latest/pages/support/#creating-minimal-reproducible-example) I’m SSHing from my macos system to my Jetson Nano 4GB kit. Then I’m following the Jetson Nano Luxinos guide linked here. I have JetPack 4.6.1 installed on my Jetson Nano. This means it comes with Python 3.6.1. I’ve updated to python 3.10.11 successfully, so that is not an issue.

khalid@khalidjetson:~/Luxonis/depthai$ python3 --version
Python 3.10.11

Expected behavior I’m expecting the depthai_demo.py script to run successfully without any errors.

Pipeline Graph

Please also provide a screenshot of your pipeline using the DepthAI Pipeline Graph.

I attempted to use pipeline_graph . When I ran this, I received the error mentioned in the guide.

khalid@khalidjetson:~/Luxonis/depthai$ pipeline_graph "python3 depthai_demo.py"
Traceback (most recent call last):
  File "/home/khalid/.local/bin/pipeline_graph", line 5, in <module>
    from depthai_pipeline_graph.pipeline_graph import main
  File "/home/khalid/.local/lib/python3.10/site-packages/depthai_pipeline_graph/pipeline_graph.py", line 7, in <module>
    from Qt import QtWidgets, QtCore
  File "/home/khalid/.local/lib/python3.10/site-packages/Qt.py", line 1938, in <module>
    _install()
  File "/home/khalid/.local/lib/python3.10/site-packages/Qt.py", line 1886, in _install
    raise ImportError("No Qt binding were found.")
ImportError: No Qt binding were found.

Then I attempted to run pip install PySide2 per the guides recommendation, but I received the following error

khalid@khalidjetson:~/Luxonis/depthai$ pip install PySide2
Defaulting to user installation because normal site-packages is not writeable
ERROR: Could not find a version that satisfies the requirement PySide2 (from versions: none)
ERROR: No matching distribution found for PySide2

Attach system log

• Provide output of log_system_information.py

khalid@khalidjetson:~/Luxonis/depthai$ python3 log_system_information.py 
{
    "architecture": "64bit ELF",
    "machine": "aarch64",
    "platform": "Linux-4.9.337-tegra-aarch64-with-glibc2.27",
    "processor": "aarch64",
    "python_build": "main Jul 25 2023 19:48:07",
    "python_compiler": "GCC 7.5.0",
    "python_implementation": "CPython",
    "python_version": "3.10.11",
    "release": "4.9.337-tegra",
    "system": "Linux",
    "version": "#1 SMP PREEMPT Thu Jun 8 21:19:14 PDT 2023",
    "win32_ver": "",
    "packages": [
        "blobconverter==1.4.2",
        "boto3==1.28.11",
        "botocore==1.31.11",
        "certifi==2023.7.22",
        "charset-normalizer==2.0.12",
        "depthai==2.21.2.0",
        "depthai-pipeline-graph @ git+https://github.com/luxonis/depthai_pipeline_graph.git@848a147009ffca578a85910ed298ab4430c67727",
        "depthai-sdk==1.9.4",
        "distinctipy==1.2.2",
        "ffmpy3==0.2.4",
        "idna==3.4",
        "jmespath==1.0.1",
        "lz4==4.3.2",
        "marshmallow==3.17.0",
        "mcap==1.1.0",
        "mcap-ros1-support==0.0.8",
        "numpy==1.25.1",
        "opencv-contrib-python==4.5.5.62",
        "packaging==23.1",
        "pip==23.2.1",
        "python-dateutil==2.8.2",
        "pytube==15.0.0",
        "PyTurboJPEG==1.6.4",
        "pyusb==1.2.1",
        "PyYAML==6.0.1",
        "Qt.py==1.3.8",
        "requests==2.26.0",
        "rosbags==0.9.11",
        "ruamel.yaml==0.17.32",
        "ruamel.yaml.clib==0.2.7",
        "s3transfer==0.6.1",
        "scipy==1.11.1",
        "sentry-sdk==1.5.1",
        "setuptools==65.5.0",
        "six==1.16.0",
        "types-PySide2==5.15.2.1.5",
        "urllib3==1.26.16",
        "xmltodict==0.13.0",
        "zstandard==0.21.0"
    ],
    "usb": [
        {
            "port": 1,
            "vendor_id": "0x0bda",
            "product_id": "0x0411",
            "speed": "Super"
        },
        {
            "port": 0,
            "vendor_id": "0x1d6b",
            "product_id": "0x0003",
            "speed": "Super"
        },
        {
            "port": 4,
            "vendor_id": "0x03e7",
            "product_id": "0x2485",
            "speed": "High"
        },
        {
            "port": 2,
            "vendor_id": "0x0bda",
            "product_id": "0x5411",
            "speed": "High"
        },
        {
            "port": 0,
            "vendor_id": "0x1d6b",
            "product_id": "0x0002",
            "speed": "High"
        }
    ],
    "uname": [
        "Linux khalidjetson 4.9.337-tegra #1 SMP PREEMPT Thu Jun 8 21:19:14 PDT 2023 aarch64 aarch64"
    ]
}
System info gathered successfully - saved as "log_system_information.json"

Additional context I’ve tried many many different installation attempts, but each one seems to have the same exact error / outcome that I mentioned at the top of this ticket. Hoping someone can help!