[BUG] Picamera2() can not start ... missing Attributes

[ChiroxTreichel]

Describe the bug A working script stopped working after an pi-reboot. The Error appears in picamera2.py itself. The Instance can not be created, because the attributes, it searches, dont exist.

To Reproduce i cant reproduce it either ...

Expected behaviour To Start the Camera and the Webserver properly

Console Output, Screenshots

 Traceback (most recent call last):
   File "/var/www/html/cam.py", line 134, in <module>
     picam2 = Picamera2()
              ^^^^^^^^^^^
   File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 242, in __init__
     camera_num = self.global_camera_info()[camera_num]['Num']
                  ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
 IndexError: list index out of range
 Exception ignored in: <function Picamera2.__del__ at 0x7fff2dd2ba60>
 Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 404, in __del__
     self.close()
   File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 604, in close
     if self._preview:
        ^^^^^^^^^^^^^
 AttributeError: 'Picamera2' object has no attribute '_preview'

Hardware : Rapsberry Pi 5 8GB pi cam rev 1.3

Additional context The script i use (modified), can be found here: https://talutah.de/cam.py

[ChiroxTreichel]

Error appeared due to a wrong wired camera

[yalcins]

I have same problem. I use raspberry pi 4 and Pi camera 3 wide. After reboot didn't work. and I tried:

!/usr/bin/python3

The QtPreview uses software rendering and thus makes more use of the

CPU, but it does work with X forwarding, unlike the QtGlPreview.

import time

from picamera2 import Picamera2, Preview

picam2 = Picamera2() picam2.start_preview(Preview.QT)

preview_config = picam2.create_preview_configuration() picam2.configure(preview_config)

picam2.start() time.sleep(5)

And error: pi@raspberrypi:~/Documents/ToGo $ python3 picam2_Test.py [0:23:33.615204968] [2909] INFO Camera camera_manager.cpp:284 libcamera v0.2.0+46-075b54d5 Traceback (most recent call last): File "/home/pi/Documents/ToGo/picam2_Test.py", line 10, in picam2 = Picamera2() ^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 242, in init camera_num = self.global_camera_info()[camera_num]['Num']

IndexError: list index out of range
Exception ignored in: <function Picamera2.__del__ at 0xe7340348>
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 404, in __del__
    self.close()
  File "/usr/lib/python3/dist-packages/picamera2/picamera2.py", line 604, in close
    if self._preview:
       ^^^^^^^^^^^^^
AttributeError: 'Picamera2' object has no attribute '_preview'