USB camera preview

1. View video device

ls /dev/video*

The result of the picture is the result of connecting two CSI cameras and one USB camera: generally, a CSI camera displays one video device, and a USB camera displays two video devices. The USB camera selects the newly added and smaller /dev/video2 call (connecting the USB camera system adds /dev/video2 and /dev/video3 device numbers)

2. GUVCView

GUVCView is an open source software for Linux systems, used to capture and record videos and images, mainly for Webcam cameras.

2.1, GUVCView installation

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sudo apt update
sudo apt install guvcview -y

2.2, GUVCView use

Enter the application menu bar and click the guvcview icon or enter the startup command in the terminal: Select USB camera, CSI camera has no preview screen

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guvcview

3. VLC

VLC media player is a free and open source multimedia player that supports multiple audio and video formats as well as DVD, audio CD, VCD and various streaming protocols.

3.1. VLC installation

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sudo apt update
sudo apt install vlc -y

3.2. VLC usage

Enter the application menu bar and click VLC media player icon or enter the start command in the terminal: Select USB camera, CSI camera has no preview screen

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vlc

Select the device number corresponding to the USB camera: