[BUG] qt.qpa.xcb : execution of example yuv_to_rgb.py with bookworm

[alain-lnpcrd]

login@raspberrypi:~ $ python3
Python 3.11.2 (main, Mar 13 2023, 12:18:29) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> #!/usr/bin/python3
>>> 
>>> import cv2
>>> 
>>> from picamera2 import Picamera2

>>> 
>>> cv2.startWindowThread()
0
>>> 
>>> picam2 = Picamera2()
[3:08:41.504097520] [3885]  INFO Camera camera_manager.cpp:284 libcamera v0.1.0+99-4a23664b
[3:08:41.550022502] [3889]  WARN RPiSdn sdn.cpp:39 Using legacy SDN tuning - please consider moving SDN inside rpi.denoise
[3:08:41.552841720] [3889]  INFO RPI vc4.cpp:444 Registered camera /base/soc/i2c0mux/i2c@1/ov5647@36 to Unicam device /dev/media3 and ISP device /dev/media1
[3:08:41.552929257] [3889]  INFO RPI pipeline_base.cpp:1142 Using configuration file '/usr/share/libcamera/pipeline/rpi/vc4/rpi_apps.yaml'
[3:08:41.556522413] [3885]  INFO Camera camera_manager.cpp:284 libcamera v0.1.0+99-4a23664b
[3:08:41.597647434] [3892]  WARN RPiSdn sdn.cpp:39 Using legacy SDN tuning - please consider moving SDN inside rpi.denoise
[3:08:41.599989971] [3892]  INFO RPI vc4.cpp:444 Registered camera /base/soc/i2c0mux/i2c@1/ov5647@36 to Unicam device /dev/media3 and ISP device /dev/media1
[3:08:41.600150543] [3892]  INFO RPI pipeline_base.cpp:1142 Using configuration file '/usr/share/libcamera/pipeline/rpi/vc4/rpi_apps.yaml'
>>> config = picam2.create_preview_configuration(lores={"size": (640, 480)})
>>> picam2.configure(config)
[3:08:41.609306673] [3885]  INFO Camera camera.cpp:1181 configuring streams: (0) 640x480-XBGR8888 (1) 640x480-YUV420 (2) 640x480-SGBRG10_CSI2P
[3:08:41.609869169] [3892]  INFO RPI vc4.cpp:608 Sensor: /base/soc/i2c0mux/i2c@1/ov5647@36 - Selected sensor format: 640x480-SGBRG10_1X10 - Selected unicam format: 640x480-pGAA
>>> picam2.start()
>>> 
>>> while True:
...     yuv420 = picam2.capture_array("lores")
...     rgb = cv2.cvtColor(yuv420, cv2.COLOR_YUV420p2RGB)
...     cv2.imshow("Camera", rgb)
... 
qt.qpa.xcb: QXcbConnection: XCB error: 148 (Unknown), sequence: 192, resource id: 0, major code: 140 (Unknown), minor code: 20

A frame qt appears but without the video

RPi 4B 2GB
Linux raspberrypi 6.1.0-rpi6-rpi-v8 #1 SMP PREEMPT Debian 1:6.1.58-1+rpt2 (2023-10-27) aarch64 GNU/Linux
Debian GNU/Linux 12 (bookworm) Release: 12
Python 3.11.2
python3-picamera2/stable,stable,now 0.3.14-1
xcb/stable,now 2.4-8 arm64

[davidplowman]

Hi, thanks for the report. I've tried running

import cv2

from picamera2 import Picamera2

cv2.startWindowThread()

picam2 = Picamera2()
config = picam2.create_preview_configuration(lores={'size': (640, 480)})
picam2.configure(config)
picam2.start()

while True:
    yuv420 = picam2.capture_array('lores')
    rgb = cv2.cvtColor(yuv420, cv2.COLOR_YUV420p2RGB)
    cv2.imshow('Camera', rgb)
    cv2.waitKey(1)

on the latest Raspberry Pi OS image on a Pi 4 and it seems to work as expected. Can you say if yours is a completely clean installation or whether anything has been changed? Are you running locally on your Pi (with a screen plugged in), or remotely? The error seems to suggest a problem with your Qt installation or version - can you say how you have installed PyQt5 and OpenCV?

It might be worth trying the same experiment I did - install a new image, let it do its updates, install OpenCV using sudo apt install -y python3-opencv, and then, without touching anything else at all, run the above script.

Thanks!

[alain-lnpcrd]

Hi,
Thanks for your interest.
I encountered this problem by adapting the software of a toy robot equipped with a raspberrypi 4B 2Go to Raspberryi-OS Bookworm. An installation on an Sd card, the recovery of the robot software. the installation of the python3--xyz modules, if they exist, and for others, installations with pip install in the python virtual space.
For the Qt5 packages I tried to put the ones installed under bullsey under bookworm. I'll check tomorrow if everything is there.

I almost forgot. I did an update/upgrade but it's always the same

[davidplowman]

Thanks for the update. The usual culprits are PyQt5 and OpenCV. If you can install both of them from apt (sudo install -y python3-qt5 python3-opencv) then they will work together. People often find that installing from pip often gives rise to incompatible versions, so I would certainly consider removing any pip versions that you have and going with apt, if that's possible for you.

[alain-lnpcrd]

Hi

python3-qt5 and pyrhon3-opencv are installed and there are no competition-installed pip modules.

login@raspberrypi:~ $ apt list | grep python3* | grep installé

WARNING: apt does not have a stable CLI interface. Use with caution in scripts.

libpython3-dev/stable,now 3.11.2-1+b1 arm64  [installé, automatique]
libpython3-stdlib/stable,now 3.11.2-1+b1 arm64  [installé, automatique]
libpython3.11-dev/stable,now 3.11.2-6 arm64  [installé, automatique]
libpython3.11-minimal/stable,now 3.11.2-6 arm64  [installé, automatique]
libpython3.11-stdlib/stable,now 3.11.2-6 arm64  [installé, automatique]
libpython3.11/stable,now 3.11.2-6 arm64  [installé, automatique]
python-apt-common/stable,stable,now 2.6.0 all  [installé, automatique]
python-babel-localedata/stable,stable,now 2.10.3-1 all  [installé, automatique]
python-is-python3/stable,stable,now 3.11.1-3 all  [installé]
python3-apt/stable,now 2.6.0 arm64  [installé, automatique]
python3-asgiref/stable,stable,now 3.6.0-1 all  [installé, automatique]
python3-astroid/stable,stable,now 2.14.2-1 all  [installé, automatique]
python3-asttokens/stable,stable,now 2.2.1-1 all  [installé, automatique]
python3-av/stable,now 10.0.0-1+rpt2 arm64  [installé, automatique]
python3-babel/stable,stable,now 2.10.3-1 all  [installé, automatique]
python3-blinker/stable,stable,now 1.5-1 all  [installé, automatique]
python3-bs4/stable,stable,now 4.11.2-2 all  [installé, automatique]
python3-cairo/stable,now 1.20.1-5+b1 arm64  [installé, automatique]
python3-certifi/stable,stable,now 2022.9.24-1 all  [installé, automatique]
python3-cffi-backend/stable,now 1.15.1-5+b1 arm64  [installé, automatique]
python3-chardet/stable,stable,now 5.1.0+dfsg-2 all  [installé, automatique]
python3-charset-normalizer/stable,stable,now 3.0.1-2 all  [installé, automatique]
python3-click/stable,stable,now 8.1.3-2 all  [installé, automatique]
python3-colorama/stable,stable,now 0.4.6-2 all  [installé, automatique]
python3-colorzero/stable,stable,now 2.0-2 all  [installé, automatique]
python3-cryptography/stable,now 38.0.4-3 arm64  [installé, automatique]
python3-cups/stable,now 2.0.1-5+b4 arm64  [installé, automatique]
python3-cupshelpers/stable,stable,now 1.5.18-1 all  [installé, automatique]
python3-dbus/stable,now 1.3.2-4+b1 arm64  [installé, automatique]
python3-debconf/stable,stable,now 1.5.82 all  [installé, automatique]
python3-dev/stable,now 3.11.2-1+b1 arm64  [installé]
python3-dill/stable,stable,now 0.3.6-1 all  [installé, automatique]
python3-distlib/stable,stable,now 0.3.6-1 all  [installé, automatique]
python3-distro/stable,stable,now 1.8.0-1 all  [installé, automatique]
python3-distutils/stable,stable,now 3.11.2-3 all  [installé, automatique]
python3-docutils/stable,stable,now 0.19+dfsg-6 all  [installé, automatique]
python3-dotenv/stable,stable,now 0.21.0-1 all  [installé, automatique]
python3-filelock/stable,stable,now 3.9.0-1 all  [installé, automatique]
python3-flask-cors/stable,stable,now 3.0.10-2 all  [installé]
python3-flask/stable,stable,now 2.2.2-3 all  [installé]
python3-gi-cairo/stable,now 3.42.2-3+b1 arm64  [installé, automatique]
python3-gi/stable,now 3.42.2-3+b1 arm64  [installé, automatique]
python3-gpiozero/stable,stable,now 2.0-1 all  [installé]
python3-html5lib/stable,stable,now 1.1-3 all  [installé, automatique]
python3-ibus-1.0/stable,stable,now 1.5.27-5 all  [installé, automatique]
python3-idna/stable,stable,now 3.3-1 all  [installé, automatique]
python3-importlib-metadata/stable,stable,now 4.12.0-1 all  [installé, automatique]
python3-isort/stable,stable,now 5.6.4-1 all  [installé, automatique]
python3-itsdangerous/stable,stable,now 2.1.2-3 all  [installé, automatique]
python3-jedi/stable,stable,now 0.18.2-1 all  [installé, automatique]
python3-jinja2/stable,stable,now 3.1.2-1 all  [installé, automatique]
python3-jwt/stable,stable,now 2.6.0-1 all  [installé, automatique]
python3-kms++/stable,now 0~git20230930~162059+b91affd-1 arm64  [installé, automatique]
python3-lazy-object-proxy/stable,now 1.9.0-1+b1 arm64  [installé, automatique]
python3-lgpio/stable,now 0.2.2-1~rpt1 arm64  [installé, automatique]
python3-lib2to3/stable,stable,now 3.11.2-3 all  [installé, automatique]
python3-libcamera/stable,now 0.1.0+rpt20231020-1 arm64  [installé, automatique]
python3-libevdev/stable,stable,now 0.5-3 all  [installé, automatique]
python3-libgpiod/stable,now 1.6.3-1+b3 arm64  [installé]
python3-logilab-common/stable,stable,now 1.9.8-1 all  [installé, automatique]
python3-lxml/stable,now 4.9.2-1+b1 arm64  [installé, automatique]
python3-markupsafe/stable,now 2.1.2-1+b1 arm64  [installé, automatique]
python3-mccabe/stable,stable,now 0.7.0-1 all  [installé, automatique]
python3-minimal/stable,now 3.11.2-1+b1 arm64  [installé, automatique]
python3-more-itertools/stable,stable,now 8.10.0-2 all  [installé, automatique]
python3-mypy-extensions/stable,stable,now 0.4.3-4 all  [installé, automatique]
python3-mypy/stable,now 1.0.1-1 arm64  [installé, automatique]
python3-numpy/stable,now 1:1.24.2-1 arm64  [installé]
python3-oauthlib/stable,stable,now 3.2.2-1 all  [installé, automatique]
python3-olefile/stable,stable,now 0.46-3 all  [installé, automatique]
python3-opencv/stable,now 4.6.0+dfsg-12 arm64  [installé]
python3-opengl/stable,stable,now 3.1.6+dfsg-3 all  [installé, automatique]
python3-openssl/stable,stable,now 23.0.0-1 all  [installé, automatique]
python3-parso/stable,stable,now 0.8.3-1 all  [installé, automatique]
python3-pexpect/stable,stable,now 4.8.0-4 all  [installé, automatique]
python3-pgzero/stable,stable,now 1.2.post4+dfsg-2 all  [installé]
python3-picamera2/stable,stable,now 0.3.14-1 all  [installé]
python3-pidng/stable,now 4.0.9-1+bookworm arm64  [installé, automatique]
python3-piexif/stable,stable,now 1.1.3-2 all  [installé, automatique]
python3-pigpio/stable,stable,now 1.79-1+rpt1 all  [installé]
python3-pil/stable,now 9.4.0-1.1+b1 arm64  [installé, automatique]
python3-pip-whl/stable,stable,now 23.0.1+dfsg-1+rpt1 all  [installé, automatique]
python3-pip/stable,stable,now 23.0.1+dfsg-1+rpt1 all  [installé]
python3-pkg-resources/stable,stable,now 66.1.1-1 all  [installé, automatique]
python3-platformdirs/stable,stable,now 2.6.0-1 all  [installé, automatique]
python3-prctl/stable,now 1.8.1-1+b2 arm64  [installé, automatique]
python3-psutil/stable,now 5.9.4-1+b1 arm64  [installé]
python3-ptyprocess/stable,stable,now 0.7.0-5 all  [installé, automatique]
python3-py/stable,stable,now 1.11.0-1 all  [installé, automatique]
python3-pygame/stable,now 2.1.2+dfsg-5+b1 arm64  [installé]
python3-pygments/stable,stable,now 2.14.0+dfsg-1 all  [installé, automatique]
python3-pyinotify/stable,stable,now 0.9.6-2 all  [installé, automatique]
python3-pyqt5.sip/stable,now 12.11.1-1 arm64  [installé, automatique]
python3-pyqt5/stable,now 5.15.9+dfsg-1 arm64  [installé]
python3-pyudev/stable,stable,now 0.24.0-1 all  [installé, automatique]
python3-renderpm/stable,now 3.6.12-1+b1 arm64  [installé, automatique]
python3-reportlab-accel/stable,now 3.6.12-1+b1 arm64  [installé, automatique]
python3-reportlab/stable,stable,now 3.6.12-1 all  [installé, automatique]
python3-requests-oauthlib/stable,stable,now 1.3.0+ds-1 all  [installé, automatique]
python3-requests/stable,stable,now 2.28.1+dfsg-1 all  [installé, automatique]
python3-responses/stable,stable,now 0.18.0-1 all  [installé, automatique]
python3-roman/stable,stable,now 3.3-3 all  [installé, automatique]
python3-rpi.gpio/stable,now 0.7.1~a4-1+b4 arm64  [installé]
python3-rtimulib/stable,now 7.2.1-6+bookworm arm64  [installé, automatique]
python3-send2trash/stable,stable,now 1.8.1~b0-2 all  [installé, automatique]
python3-sense-hat/stable,stable,now 2.6.0-1 all  [installé, automatique]
python3-serial/stable,stable,now 3.5-1.1 all  [installé]
python3-setuptools-whl/stable,stable,now 66.1.1-1 all  [installé, automatique]
python3-setuptools/stable,stable,now 66.1.1-1 all  [installé, automatique]
python3-simplejpeg/stable,now 1.6.6-1 arm64  [installé, automatique]
python3-simplejson/stable,now 3.18.3-1 arm64  [installé, automatique]
python3-six/stable,stable,now 1.16.0-4 all  [installé, automatique]
python3-smbc/stable,now 1.0.23-2+b4 arm64  [installé, automatique]
python3-smbus2/stable,now 0.4.2-1 arm64  [installé]
python3-smbus/stable,now 4.3-2+b3 arm64  [installé, automatique]
python3-soupsieve/stable,stable,now 2.3.2-1 all  [installé, automatique]
python3-spidev/stable,now 20200602~200721-1+bookworm arm64  [installé]
python3-tk/stable,now 3.11.2-3 arm64  [installé]
python3-toml/stable,stable,now 0.10.2-1 all  [installé, automatique]
python3-tomlkit/stable,stable,now 0.11.7-1 all  [installé, automatique]
python3-twython/stable,stable,now 3.8.2+dfsg-2 all  [installé]
python3-typeshed/stable,stable,now 0.0~git20221107.4f381af-1 all  [installé, automatique]
python3-typing-extensions/stable,stable,now 4.4.0-1 all  [installé, automatique]
python3-tz/stable,stable,now 2022.7.1-4 all  [installé, automatique]
python3-urllib3/stable,stable,now 1.26.12-1 all  [installé, automatique]
python3-v4l2/stable,stable,now 0.3.2-1 all  [installé, automatique]
python3-venv/stable,now 3.11.2-1+b1 arm64  [installé, automatique]
python3-virtualenv/stable,stable,now 20.17.1+ds-1 all  [installé, automatique]
python3-webencodings/stable,stable,now 0.5.1-5 all  [installé, automatique]
python3-websockets/stable,stable,now 10.4-1 all  [installé]
python3-werkzeug/stable,stable,now 2.2.2-3 all  [installé, automatique]
python3-wheel-whl/stable,stable,now 0.38.4-2 all  [installé, automatique]
python3-wheel/stable,stable,now 0.38.4-2 all  [installé, automatique]
python3-wrapt/stable,now 1.14.1-2+b2 arm64  [installé, automatique]
python3-zipp/stable,stable,now 1.0.0-6 all  [installé, automatique]
python3-zmq/stable,now 24.0.1-4+b1 arm64  [installé]
python3.11-dev/stable,now 3.11.2-6 arm64  [installé, automatique]
python3.11-minimal/stable,now 3.11.2-6 arm64  [installé, automatique]
python3.11-venv/stable,now 3.11.2-6 arm64  [installé, automatique]
python3.11/stable,now 3.11.2-6 arm64  [installé, automatique]
python3/stable,now 3.11.2-1+b1 arm64  [installé, automatique]

login@raspberrypi:~ $ pip freeze -l
login@raspberrypi:~ $ 

(venv) login@raspberrypi:~/Adeept_AWR $ pip freeze -l
Adafruit-GPIO==1.0.3
Adafruit-PCA9685==1.0.1
Adafruit-PureIO==1.1.11
imutils==0.5.4
mpu6050-raspberrypi==1.2
pybase64==1.3.1
rpi-ws281x==5.0.0

The virtual python env is not used in this case