Tag Archives: picamera

RaspberryPi Camera not detected – Ubuntu 20.04.5 LTS

Hi everyone,

I ran into a bit of an issue with a RaspberryPi 4 running Ubuntu 20.04.5 this morning. Running vcgencmd get_camera should have returned supported=1 detected=1 but instead I was getting supported=0 detected=0.

This was a bit of a hard one to track down with Google but I eventually came across a stackoverflow post suggesting the following:

  • Run sudo nano /boot/firmware/config.txt
  • Add start_x=1 at the end
  • Reboot

Check out this post for more info: https://askubuntu.com/a/1244259/770194.

If you’re using a new camera you may also run into this error:

mmal: Cannot read camera info, keeping the defaults for OV5647
mmal: mmal_vc_component_create: failed to create component 'vc.ril.camera' (1:ENOMEM)
mmal: mmal_component_create_core: could not create component 'vc.ril.camera' (1)
mmal: Failed to create camera component
mmal: main: Failed to create camera component
mmal: Only 76M of gpu_mem is configured. Try running "sudo raspi-config" and ensure that "memory_split" has a value of 128 or greater

The fix for this one is to simply append another line to /boot/firmware/config.txt. All you’ll need is gpu_mem=128.

Another issue you might run into is VHCI initialization failed. Generally, that just means you need to add your current user to the video group.

# Check your current user's groups.
groups

# Add your user to the video group.
sudo usermod -aG video <username>

Once you’ve added the group, rebooting should be enough to get past that error.

Exit Raspberry Pi Camera Preview

Hey everyone,

I ran into a bit of a weird issue with a raspberry pi camera preview today. After starting the preview I hit an uncaught exception which meant that exitPreview was never called.

To get around this use the terminal hotkey and kill the python process. Note that while you won’t be able to see the terminal, it will be running in the background.

https://www.raspberrypi.org/forums/viewtopic.php?t=152239&p=998212
ctrl + alt + t
pkill python
pkill python3