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How can I view the captured content of my webcam on Linux/Raspberry? I dont want to share it, only view the content live on my monitor.

On windows Logitech has an official program where I can preview the content live. Windows has also the built-in camera program.

How does it work on Raspberry/Linux? I would like to buy the Logitech C922.

I have read recently a discussion about C922 here: Get h264 from Webcam Logitech C922 <- Will this thing affect my purpose/aims or it has no affect? (I did not fully understand that discussion)

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assuming you are using RaspberryPi-OS with a graphical user interface and the screen is directly connected to the Pi via HDMI.

Just install VLC media player by typing

sudo apt update
sudo apt install -y vlc

in the Pi's terminal.

Now, open VLC and go to Media -> Open Capture Device and select your videodevice.

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  • Thank you. I would like increase the contrast and thresholding the live captured content. This could be done with opencv python. Can I use VLC to show the 'modified' content or VLC will show the original captured content?
    – John
    Commented Jan 12, 2022 at 9:53
  • I don't know opencv but I think there would be a second videodevice to chose. Let's say /dev/video0 is your webcam with raw data, then you modify it using opencv and output it to /dev/video1. So you will have to chose /dev/video1 as input in VLC.
    – JJandke
    Commented Jan 12, 2022 at 17:10
  • Vlc does have various effect filters and adjustments. You can likely even build your own mod if you really want to.
    – Abel
    Commented Oct 9, 2022 at 15:01

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